Day 2 :
Keynote Forum
Lixin Xue
Ningbo Institute of Industrial Technologies (CAS), China
Keynote: Development and applications of lower cost high performance ionic conducting polymers
Time : 09:00-09:25
Biography:
Professor Lixin Xue, Chief Scientist of Ningbo Institute of Industrial Technologies, Chinese Academy of Sciences (NIMTE, CAS), has published over 80 scientific papers and 150 patents including 33 PCT Patents. His research interest is focused on the areas of fabricating functional polymer membranes and exploring their applications in the fields of green energy generation and storage, energy conservation and environment protection. Dr. Xue has served as reviewers for various international Journals including Journal of Materials Chemistry, Journal of Membrane Science, Desalination and Separation and Purification Technology. He is also a member of the “Thousand Talent Program†of Chinese Government.
Abstract:
High performance ionic conducting polymers are widely used in the energy conversion and storage devices, desalination processes and other areas. Commercially available per fluorinated polymer based ionomers bearing perfluroalkylsulfonic acid groups such as Nafion® polymer have shown great electrochemical stability and good ionic conductivity. However, its relatively high cost and low solvent barrier property have limited its applications in many areas. None fluorinated ionomers such as sulfonated polysulfone, sulfonated polyimide and others have been developed as lower cost alternatives, but they lack the electrochemical stability and ionic conductivity to support long term energy related applications. In this talk, we will discuss our strategy in creating lower cost high performance ionic conducting polymers with aromatic backbones bearing fluorinated side chains connecting to fluorinated alkyl sulfonimide groups. Due to the strong electronic withdrawing effects from the fluoroalkylsulfonyl groups, the negative charged on the nitrogen of sulfonimide anion could be widely delocalized and stabilized, resulting in the high mobility of the counter cations in the system. The materials showed improved solvent barrier properties because of its tighter ionic conducting channels. After summarizing our work in the syntheses of the materials, we will discuss recent progress in developing potential applications in rechargeable lithium ion battery, all vanadium redox flow battery, low energy cost electro-dialysis device, and total heat exchange energy recovery ventilation system.
Keynote Forum
Yutaka Ohno
Nagoya University, Japan
Keynote: Carbon nanotube thin films for flexible and formable electronics
Time : 09:25-09:50
Biography:
Yutaka Ohno is Professor of EcoTopia Science Institute, Nagoya University, Japan. He received the Ph.D. degrees from Nagoya University in 2000. He became an assistant professor in 2000 and an associate professor in 2008 of Nagoya University. He was also Research Fellow of JSPS from 1999 to 2000, Research Scientist of JST from 2004 to 2007, and Visiting Professor of Aalto University, Finland from 2012 to 2013. He is also Visiting Professor of Kyoto University in 2015. He published 120 papers in major journals and talked more than 50 invited talks in international conferences.
Abstract:
Flexible and stretchable electronics are attracting much attention because of the variety of potential applications from flexible e-papers though wearable healthcare devices. Among various kinds of electronic materials, carbon nanotube thin films have advantages in flexibility, stretchability, and performance because of the excellent electronic and mechanical properties. Three-dimensional formability is also unique property of carbon nanotube thin film devices, leading to new form of electron devices. Low cost manufacturing is also possible with printing techniques due to the good processability of carbon nanotube films. In the presentation, I will talk about the recent works on flexible and stretchable devices based on carbon nanotube thin films for realizing wearable healthcare electronics, including high-mobility thin-film transistors, integrated circuits and biosensors fabricated on plastic films. The simple fabrication processes based on micro-patterning technique of CNT films and high-throughput printing techniques will also be presented.
- Track 2: Nanotechnology in Materials Science
Track 3: Energy Materials
Chair
Martin Ntwaeaborwa
University of the Free State, South Africa
Co-Chair
Jun DING
National University of Singapore, Singapore
Session Introduction
Martin Ntwaeaborwa
University of the Free State, South Africa
Title: Luminescent properties of powder and pulsed laser deposited thin film phosphors and their applications in lighting, phototherapy and solar cells
Time : 09:50-10:10
Biography:
Martin Ntwaeaborwa completed his PhD from the University of the Free State in 2006. He is the president of the South African Nanotechnology Initiative. He has published more than 150 papers in prestigious journals and has given numerous invited talks at local and international conference. He has received numerous awards including young investigator awards from the South African National Science and Technology Forum and American Vacuum Society in 2009 and 2010 respectively. He research interests are on surface science and luminescent nanomaterials in powder and thin films forms applied to displays, phototherapy and photovoltaics.
Abstract:
Phosphors are often used as powders, even though thin films offer higher resolution and better chemical stability. We have investigated structure, cathodoluminescent (CL) and photoluminescent (PL) properties of powders and thin films of several phosphors such as ZnO, CaS:Eu, SrAl2O4:Eu2+,Dy3+; SiO2:Ce3+,Tb3+ and ZnO. The thin films were ablation deposited onto Si (100) substrates using either conventional pulsed laser deposition (PLD) or pulsed reactive crossed beam laser ablation (PRCLA). Several deposition parameters were varied, including vacuum versus partial pressure of gas (O2 or Ar), type of laser pulse, and substrate temperature using excimer lasers. Both the CL and PL intensities were strongly dependent on the deposition conditions and post-deposition annealing. We demonstrated that the photoluminescent (PL) intensity from Ce3+ doped in an amorphous SiO2 matrix was increased by a factor of about ten when five nanometer (5 nm) diameter ZnO was added to the SiO2 matrix. This is unusual since the energy of Ce3+ PL emission (2.7 eV) is larger than that from PL emission from ZnO (2.3 eV). We demonstrated that the energy transfer probably took place by excited electrons moving from Znâ€O antiâ€bonding orbitals to similar orbitals on the Ce3+ with a subsequent radiative relaxation towards the ground state. We also demonstrated enhanced ultraviolet B emission for phototherapy lamp application from Gd3+ in calcium phosphate host. Mechanisms of energy transfer in different phosphors will be discussed. Finally, the use of ZnO nanoparticles to improve the power conversion efficiency of solution processed organic solar cells will be discussed.
Jun DING
National University of Singapore, Singapore
Title: Synthesis of Fe3O4 nanostructures and their applications
Time : 10:10-10:30
Biography:
Dr Jun DING obtained his Diplom Physics from University of Wuppertal in 1986, and PhD degree from Ruhr University Bochum, Germany in 1990. He has been working on magnetic and nanostructured materials for more than 25 years. He is currently working as Professor at Department of Materials Science & Engineering, National University of Singapore. He has published over 350 journal papers with a total citation > 9000 and H-Index = 52.
Abstract:
Magnetic nanostructures have been fabricated by wet-chemical routes, such as thermal decomposition and hydrothermal process. For magnetic nanoparticles, we have fabricated spherical Fe3O4 nanoparticles. We have also synhtesized Fe3O4 naorings and nanodiscs. Because of their vortex domain structure, magnetic nanorings and nanodiscs can be relatively well suspended with suitable surfactant, even if their sizes are much larger than the critical size for superparamagnetism. These nanorings and nanodiscs possess relatively large magnetic hysteresis loss, which could result in excellent performance for magnetic hyperthermia. We have performed in-vivo hyperthermia. The results have demonstrated that magnetic nanorings are promising hyperthermia agent for cancer treatment. Fe3O4 nanodiscs could be aligned under magnetic field. This has resulted in a great enhancement of magnetic hyperthermia performance. In addition, these magnetic nanoparticles have shown excellent results for MRI contrast enhancement. In this work, we have also fabricated Fe3O4 films with enhanced magnetization.
Kirk J Ziegler
University of Florida, USA
Title: Controlling electron recombination in nanowire-based DSSCs
Time : 11:05-11:25
Biography:
Kirk J Ziegler joined the Chemical Engineering Department at the University of Florida in 2005. His research group focuses on understanding the role of interfaces in one-dimensional nanostructures, such as single wall carbon nanotubes (SWCNTs) and vertical arrays of nanowires. His work on SWCNTs has focused on understanding the effect of surfactant-nanotube interactions on dispersion and separation processes. His work on nanowire arrays has applications in energy-related devices, which requires high surface area to maximize energy generation or storage.
Abstract:
Electron recombination in dye-sensitized solar cells (DSSCs) results in significant electron loss and performance degradation. To our knowledge, the reduction of electron recombination via blocking layers in nanowire-based DSSCs has never been investigated. In this study, HfO2 or TiO2 blocking layers are deposited on nanowire surfaces via atomic layer deposition (ALD) to reduce electron recombination in nanowire-based DSSCs. The control cell consisting of ITO nanowires coated with a porous shell of TiO2 by TiCl4 treatment yields an efficiency of 2.82%. The efficiency increases dramatically to 5.38% upon the insertion of a 1.3 nm TiO2 compact layer between the nanowire surface and porous TiO2 shell. This efficiency enhancement implies that porous sol-gel coatings on nanowires (e.g., via TiCl4 treatment) result in significant electron recombination in nanowire-based DSSCs while compact coatings formed by ALD are more advantageous because of their ability to act as a blocking layer. While the insertion of a high band-gap compact layer of HfO2 between the interface of the conductive nanowire and TiO2 shell improves performance, a comparison of the cell performance between TiO2 and HfO2 compact layers indicates that charge collection is suppressed by the difference in energy states. Consequently, the use of high band-gap materials at the interface of conductive nanowires and TiO2 is not recommended.
Enrique C Samano
UNAM, Mexico
Title: Self-assembly of DNA with inorganic material
Time : 11:25-11:45
Biography:
Enrique C Samano earned his PhD degree in Physics from Stevens Institute of Technology in Hoboken, NJ. He is currently a Research Professor at Centro de Nanociencias y NanotecnologÃa at UNAM in Ensenada, BC, Mexico, working on thin film growth and surface science techniques. He has been a Visiting Scholar at University of Southern California and recently at Duke University in the DNA Nanotechnology Group. He works on the fabrication of nanostructures based on DNA with applications in electronics and plasmonics. He has published more than 30 papers in reputed journals and serving as symposiums organizer.
Abstract:
Artificial DNA nanostructures such as DNA origami have garnered significant interest as templates for sub-20 nm assembly of materials because their design allows for the incorporation of binding sites to assemble nanocomponents with 6 nm resolution. A novel method for producing complex metallic nanostructures of programmable design is presented. DNA origami templates, modified to have DNA binding sites with a uniquely coded sequence, were adsorbed onto silicon dioxide substrates. Gold nanoparticles functionalized with the complementary DNA sequence were then attached. These seed nanoparticles were later enlarged, and even fused, by electroless deposition of silver. Using this method, a variety of metallic structures, including rings, pairs of bars, and H shapes is fabricated. Preliminary results on plasmonic applications of the metallic nanostructures are presented as well.
Xuedong BAI
Chinese Academy of Sciences, China
Title: Atomistic mechanism of lithiation of nanomaterials as Li-ion battery anodes studied by in-situ TEM
Time : 11:45-12:05
Biography:
Xuedong Bai received his Ph. D degree in 1999 from Institute of Metal Research, Chinese Academy of Sciences (CAS), and then joined Institute of Physics, CAS. He is a professor of physics. He ever spent two years as a postdoc in Georgia Institute of Technology, USA, and one year in National Institute for Materials Science, Japan. Dr. Bai’s research interest is focused on in-situ TEM technique and its applications on nano research. He has co-authored over 130 publications, and given over 20 invited talks in international conference. His papers have been cited more than 6000 times and H-factor is 41.
Abstract:
The weak van der Waals interaction between the MoS2 layers allows alkali ions to intercalate without a significant volume expansion, which enables MoS2 to be an alternative as an electrode material for high capacity lithium ion batteries. Research on the electrochemical lithiation mechanism of MoS2 has important significance, both in fundamental studies and practical applications. We recently studied the dynamic electrochemical lithiation process of MoS2 nanosheets by construction of an in-situ TEM electrochemical cell. It is found that MoS2 undergoes a trigonal prismatic (2H)-octahedral (1T) phase transition upon lithium intercalation. The in-situ characterization at atomic scale provides a great leap forward in the fundamental understanding of the lithium ion storage mechanism in MoS2. MoS2 by its nature is a semiconductor with trigonal (2H) structure, where the S atoms locate in the lattice position of a hexagonal close-packed structure. Planes of Mo atoms are sandwiched between two atomic layers of S, such that each Mo is coordinated to six S atoms in a trigonal prismatic geometry (2H). Another MoS2 polytype based on tetragonal symmetry is the octahedral phase (1T) with one MoS2 layer per repeat unit. A structural transformation of 2H-1T corresponds to the electronic structure change from semiconducting to metallic. In our work, a systematical study has been performed on the structural properties of MoS2 nanosheets during the lithiation process using an in-situ electrochemical TEM holder. The results demonstrate the existence of a phase transition of 2H-MoS2 to 1T-LiMoS2 and structural modulation in the 1T-LiMoS2 in the first lithiation process. The time-lapse migration of lithiation reaction boundary is shown in the figure below. Furthermore, utilizing the in-situ measurements, the electrochemical reaction in each stage has been studied, which can also be correlated with the ex-situ performance of MoS2 coin-type cells. After the phase transition of 2H-MoS2 to 1T-LiMoS2, there follows a conversion reaction during the lithiation of MoS2. So the structural mechanism corresponding to the electrochemical property of MoS2 during lithiation can be clearly understood. In this talk, our studies on the dynamic lithiation processes of SnO2 nanowires and silicon nanowires will be also included.
Sreenath Bolisetty
ETH, Switzerland
Title: Amyloid fibrils for functional nanomaterial applications
Time : 12:05-12:25
Biography:
Sreenath Bolisetty is currently working as Postdoctoral researcher at the ETH, Zurich, Switzerland. He received his PhD degree from the University of Bayreuth, Germany and Master thesis from the Max-Planck Institute for polymer research, Mainz, Germany. His current research is focused on protein self-assembly and their inorganic nanohybrids for the functional applications. He has published 40 papers in reputed journals and 2 patents.
Abstract:
Protein aggregation plays major role in many aspects ranging from food, material and health science. We will discuss the understanding of the association processes converting globular proteins into amyloid like protein fibrils and I will emphasize how these fibrils can act as a template to build functional hybrid nanomaterials. β-lactoglobulin, the major globular whey protein, aggregates at low pH and cause the formation of fibril-structures. These β-lactoglobulin fibrils act as build blocks to prepare hybrid inorganic nanomaterials through biomineralization process. These inorganic hybrid materials have extraordinary physical properties such as conductive, magnetic and optical properties, and can serve multiple tasks, ranging from optoelectronics, sensors to delivery vehicles in living cells.
As an example, we will discuss, how gold single crystals were produced by reducing an aqueous solution of chloroauric acid by β-lactoglobulin fibrils. Remarkably, these single crystalline gold crystals show auto fluorescence and conductivity of their layered films respond to the presence of water, opening the road to possible applications in water sensing and water responsive actuators. In another example, these fibrils act as building blocks to produce TiO2 hybrid nanowires from the Ti- precursors, blending these electron accepting TiO2 hybrid nanowires with the electron donor semiconductive polythiophenes allowed designing the active layer for heterojunction photovoltaic devices. Additionally, these fibrils can be used as nanoreactors for the synthesis of several metal nanoparticles (gold, silver, palladium and iron). Interestingly, these resulting hybrids also play a central role in the internalization of nanoparticles into living cells, with up to 3-fold-enhanced transport properties over pristine nanoparticles.
Seyed Babak Mahjour
Stevens Institute of Technology, USA
Title: Enhancement of 3D electrospun polycaprolactone/collagen constructs to facilitate the integration of nanofiber/cell mats in skin graft
Time : 12:25-12:45
Biography:
Babak has completed his M.D. (Doctor of Medicine) at the age of 26 years from Shiraz University of Medical Sciences, Iran and received his M.E. (Master of Engineering) from Stevens Institute of Technology in 2012. He is Ph.D. Candidate in Biomedical Engineering department at Stevens Institute of Technology. His work has been published in 4 peer-reviewed journal articles, a book chapter, patent and numerous conference paper and posters.
Abstract:
Layer-by-layer electrospinning with the capability of producing fibers in the range of nanometers represents an optimistic method to produce versatile nanofibrous matrices to recapture the key characteristics of extracellular matrix of native tissues. In recognition of the limited cell infiltration into such electrospun nanofiber matrices, it becomes highly desirable to generate large interstitial space. In this regard, the aim of this study was to differentially modulate the spatial organization of nanofibers within the mats to achieve large interfiber distances for their efficiency in forming the integrated 3D skin-like constructs. Polycaprolactone (PCL)/collagen nanofibers were collected onto various grounded conductive surfaces to obtain the nanofiber mats composed of random, aligned and meshed fibers. The fiber diameter, morphology, and pore size were characterized by Micromasterâ„¢ inverted digital microscopes and scanning electron microscopy (SEM). Rat fibroblasts or keratinocytes were seeded onto various electrospun fiber mats. Totally, 15 layers of cell-seeded nanofiber mats were assembled either with only fibroblasts or with mixture of both cells. Various tests performed including tensile test, histological analysis, methylene blue and immunofluorescence staining. Nanofiber mats with the spinning time range of 10 to 40 seconds were used. Result for spinning within the range of 20 and 25 seconds showed more reasonable mechanical strength. Due to the presence of large pore size, cell infiltration through the nanofiber mats was significantly improved and led to a better integration between layers. The meshed nanofiber mats show their advantages in promoting cell infiltration for better formation of 3D tissues.
Satyendra Prakash Pal
Indian Institute of Science Education and Research, India
Title: Magnetic relaxation phenomena in Fe nanoparticles composited with activated carbon
Time : 12:45-13:05
Biography:
Satyendra Prakash Pal has completed his Ph D at the age of 27 years from Jawaharlal Nehru University, New Delhi, India and currently is a postdoctoral research associate in Department of Physical Sciences, Indian Institute of Science Education and Research Mohali, India. His research interst includes study of static and dynamic magnetic properties of artificially frustrated nanoparticle systems. Currently he is working on dissipation dynamics in nanomechanical oscillators.
Abstract:
Nanometer sized magnetic materials and their nanocomposites have unique properties with considerable applications in advanced technology, environmental control and biomedical applications [1, 2]. Magnetic spin-spin interactions in nanomagnetic materials play an important role in governing their magnetic behaviour. After dilution of these nanomagnetic materials with non-magnetic matrices, these spin-spin interactions weaken due to spatial separation between the magnetic entities. Here we have synthesized nanocomposite of Fe nanoparticles with activated carbon to alter the magnetic spin-spin interaction and hence study the dilution effect on the static and dynamic magnetic properties of the Fe nanoparticle system. We have synthesized Fe nanoparticles by employing a physical, top-down approach called electro explosion of wires [3]. In order to obtain the nanocomposite, 33% of Fe nanoparticles and 66% of activated carbon, by weight, were grind together in a mortar and pestle, hence denoted as (1:2) nanocomposite. Transmission electron microscopic (TEM) image shows the spherical Fe nanoparticles dispersed in carbon matrix with 13.8 nm particle size, as obtained from particle size histogram. Temperature dependent magnetization measurement for the nanocomposite does not show any blocking temperature at all, right up to the room temperature. In a manner of saying this isolated form of nanoparticles was not leaky and hence did not lose their magnetization. Magnetic hysteresis curve, taken at 300K, shows small value of the coercivity and this small hysteresis indicate the presence of an energy barrier and inherent magnetization dynamics. Langevin function fitting of the hysteresis curve gives the particle size of 15.02nm, which is almost similar to value obtained from TEM analysis. Magnetic relaxation data for the nanocomposite has been taken at a temperature of 100K. Experimental data points were fitted with a combination of two exponentially decaying function. Fitting parameters are, M0=1.71emu/g, A1= 0.09, Ï„1= 688s, A2= 0.12, and Ï„2= 6535s. In conclusion, this nanocomposite system, which has particles size in the superparamagnetic limit, behaves like a dilute ensemble of superspins with large value of the magnetic anisotropic barrier.
Nasim Hadiashar
Santa Clara University, USA
Title: Studying the effects of functionalized multi-wall Carbon nanotubes on mechanical and thermal properties of Epoxy composites
Time : 13:50-14:05
Biography:
Nasim Hadiashar has completed her Master’s at Santa Clara University. She has been working on different collaboration research project with Thermo Fisher Scientific. Her projects mainly focused on mechanical and thermal properties of Nanocomposites with different applications.
Abstract:
The goal of this study is to distinguish the effect of functionalized Multi-Wall Carbon Nanotubes (MWCNTs) on thermal and mechanical properties of epoxy composites. The custom-made epoxy resin system is composed of two different kinds of resin one with low viscosity (EPON 828) and the other one with high viscosity (EPON 1001F). The reason why functionalization of MWCNTs has been used is because of poor dispersion and aggromolation structures of CNTs. In order to overcome these obstacles, functionalization is prosperous method to strengthen interfacial adhesion between epoxy resin and MWCNTs. The CNTs were functionalized with carboxyl and diamine groups by different weight ratio of 0.1wt%, 0.2wt%, 0.5wt% and 1wt% of nanotubes during the process of functionalization. The performance of introduced approach is demonstrated through using thermal and mechanical analysis with different weight ratio. The result has been shown a decent increasement on curing temperature and Tg. Based on our TGA results, both Amin and carboxyl nano-functionalized samples have shown reduction in the amount of activation energy compared to neat epoxy sample. So it means that adding functionalized CNTs would decrease thermal stabilities and increase degradation efficiencies. In addition, nanocomposites with low loading levels of CNTs have been shown the greatest improvement in Tensile strength and Young’s modulus properties. The improvement in thermal and mechanical properties by addition of functionalized MWCNTs would extend the engineering application of epoxy resin composites.
Mohammad Al-Mamun
Griffith University, Australia
Title: Hydrothermal synthesis of MoS2 nanostructured films as high performance counter electrodes for dye-sensitized solar cells
Time : 14:05-14:20
Biography:
Mohammad Al-Mamun obtained his BS and MS degrees in Chemistry from Shahjalal University of Science and Technology, Bangladesh. Currently, he is a PhD candidate in Griffith University under the Griffith School of Environment, Australia. His current research focused on the application of functional nanomaterials for energy conversion technologies, including DSSCs, OER, ORR and HER. He has published more than 10 papers in international peer-reviewed journals.
Abstract:
A semitransparent MoS2 film with surface exposed layered nanosheet structure were successfully grown onto fluorine-doped tin oxide (FTO) conducting substrates by a facile one-pot hydrothermal method. After calcination, the as prepared MoS2 nanosheet films were directly applied as counter electrode (CE) in iodide/triiodide redox mediator based dye-sensitized solar cells (DSSCs). The hydrothermal reaction temperature and molar ratio of reaction precursors were realized to have significant impact on the overall properties of MoS2 films and thereby photovoltaic (PV) performance. The ultrathin MoS2 nanostructured film with surface exposed layered nanosheet structure can be obtained by hydrothermal treatment of the reaction solution including (NH4)6Mo7O24•4H2O and NH2CSNH2 with a molar ratio of 1:28 at 150 °C for 24 h followed by calcination at 400 °C under Ar atmosphere. The synthesized MoS2 films displayed the photoconversion efficiency (PCE) as high as 7.41%, which was ~4% higher than that obtained from Pt-based DSSCs (7.13%). The superior electrocatalytic properties reflected on the final PV performances could be due to high stability, good electrical conductivity, rich electrocatalytic active sites and good electrolyte transport property of the resulting MoS2 film. This study demonstrated the feasibility of developing low-cost and abundant metal chalcogenide electrocatalysts having high electrocatalytic activity to replace Pt-based electrocatalyst for DSSCs.
Davoud Dastan
Savitribai Phule Pune University, India
Title: The effect of preparation method on the properties of titanium dioxide nanoparticles used as a dielectric material
Time : 14:20-14:35
Biography:
Davoud Dastan has completed his MSc degree from University of Pune with a first class grade and is currently a PhD student at Savitribai Phule Pune University. He has published more than 10 papers in reputed journals.
Abstract:
The properties of materials strongly depend on the preparation technique. Titania nanoparticles (NP’s) have been prepared using various surfactants such as Acetic Acid (AA), Oleic Acid (OA), Oley amine (OM), and a mixture of (OA+OM) by two different techniques, sol-gel and solvothermal methods. The solution was under vigorous stirring, and then the resultant suspension was transformed into a teflon-line autoclave and reacted at 180 oC for 24 hours in solvothermal method to obtain the mono-dispersed titania NP’s which was dried at room temperature. TiO2 powder was collected after several times centrifugation with ethanol. Titania NP’s were annealed at 550 and 950 oC for 18 and 24 hours respectively. The structural, optical, and morphological features of TiO2 NP’s were evaluated by means of X-ray diffraction (XRD), Raman spectroscopy, ultraviolet visible (UV-vis.) Photoluminescence spectroscopy, Field Emission Scanning Electron Microscopy (FESEM), and Transmission Electron Microscopy (TEM). Titania NP’s prepared using both methods showed anatase and rutile phases for samples annealed at 550 and 950 oC whereas as prepared samples exhibited amorphous nature in case of sol-gel route and illustrated a pure anatase phase in case of solvothermal technique. The results of XRD were further confirmed by Raman spectroscopy, TEM, and FESEM. The crystallite size was almost 8-15 nm and 250-300 nm, for as prepared and annealed at 550 and 950 oC samples grown by solvothermal and sol-gel routes respectively. UV-visible corroborates the energy band 3.26, 3.04 and 2.94 eV for as-prepared and sintered at 550 and 950 oC TiO2 NP’s.
Adrine Malek Khachatourian
KTH – Royal Institute of Technology, Sweden
Title: Y2O3:Eu3+ nanophosphors: Synthesis by microwave-assisted heating method and characterization
Time : 14:35-14:50
Biography:
Adrine Malek Khachatourian has completed her BSc degree in Material Science and Engineering in 2008 and her MSc degree in Materials Engineering-Ceramic in 2010 from Iran University of Science and Technology (IUST). She spent two years on her PhD at (IUST) and now she is completing her PhD study at the Department of Materials & Nano Physics, KTH-Royal Institute of Technology, Stockholm, Sweden under the guidance of Prof. Muhammet S. Toprak. Her research interest focuses on synthesis and characterization of Rare-earth doped Yttrium oxide nanoparticles for fluorescent bioimaging via microwave method.
Abstract:
Rare earth doped Y2O3 based nanophosphors, especially Y2O3:Eu3+ compounds have recently received an increased research interest due to their potential applications in display devices, temperature sensing devices, solid state lasers, as well as bio labels, bioimaging probes and medical diagnostics. Here, we report on the fabrication of monodispersed spherical Y2O3:Eu3+ nanophosphors using microwave-assisted heating method. This method is a green, energy efficient, high yield and highly reproducible. The effect of different reaction parameters on morphological characterization, as well as the correlation between Eu3+ doping and calcination temperature on the structural and luminescence properties of Y2O3:Eu3+ nanoparticles are investigated in detail. X-ray diffraction (XRD) analysis indicates that the as prepared particles have Y(OH)CO3 composition, which converts to Y2O3:Eu3+ starting from 500 °C and become crystalline at higher temperatures. The transmission electron microscopy (TEM) micrographs show that the particles are spherical, monodispersed and non-agglomerated. High resolution TEM reveals polycrystalline nature of the calcined particles. Furthermore, increasing Eu3+ concentration from 0 mol % to 13 mol % the overall size of particles increases from 61 ± 8 nm to 86 ± 9 nm. Photoluminescence (PL) analysis of Y2O3:Eu3+ particles indicates a strong red emission peak at 613 nm corresponding to 5D0–7F2 forced electric dipole transition of Eu3+ ions under UV excitation. The emission peak increases proportionally with Eu3+ concentration and the calcination temperature with no luminescence quenching phenomenon observed even for Y2O3:13%Eu3+. The red emission characteristics, the morphological properties as spherical shape, monodispersity and nonagglomeration, combined with being heavy-metal free render these particles as promising bio-labels and bio imaging probes.
Coffee Break 15:50-16:05 @ Foyer
15:50-17:50 : Poster Presentations @ Continental Ballroom 1-3
Dikshita Gupta
Jaypee University of Information Technology, India
Title: Effect of reaction temperature and silver concentration on morphology of palladium nanoparticles
Biography:
Dikshita Gupta has completed her M.Sc. in 2010 and M.Phil in 2012 in Physics from Himachal Pradesh University, Shimla (H.P.), India. She is presently persuing Ph.D in Physics and Materials Science from Jaypee University of Information Technology, Waknaghat, Dist. Solan (H.P.), India. Her main interests are chemical synthesis of nanomaterials and their application in chemical sensors.
Abstract:
In this work, we performed the controlled synthesis of palladium nanoparticles by a procedurally simple chemical reduction method-Polyol method at 80oC, 100oC, and 120oC. Pd2+ was reduced to Pd0 using ethylene glycol as reducing agent and the particle growth was controlled by using PVP (Polyvinylpyrrolidone) as capping agent. We used TEM (Transmission Electron Microscopy) to study the effect of temperature on size and shape of palladium nanoparticles. The average particle sizes were found to be 7.5 nm at 80oC, 9.5 nm at 100oC and 10.5 nm at 120oC. Palladium nanoparticles synthesized at 100oC have better size and shape uniformity. To check the effect of silver on the shape of palladium nanoparticles (prepared at 100oC), a colloidal solution of silver was prepared by the same polyol method at 50oC and was added to the solution where palladium reduction process is taking place. A crystallographic approach concerning the role of silver cations on the shape of palladium nanoparticles have been discussed. The evidence of the formation of bimetallic system is given by the position of absorption peak coming between absorption peak of palladium nanoparticles and colloidal silver in UV spectroscopic studies. The red shift in the UV absorption spectra of silver palladium system with the increase in content of silver ions was observed.
M. Arulmozhi
Anna University, India
Title: Solution based synthesis of ZnO nanostructures and its application in p-n Heterojunction diodes
Biography:
Dr. M.Arulmozhi received her doctorate in the field of chemical engineering from National Institute of Technology, Tiruchirappalli, India. She is currently associate professor at Anna University, BIT Campus, Tiruchirappalli, India. She worked in the areas of Foam separation, waste water treatment, Bio process and control Engineering. Her current research interests include Nanomaterial Synthesis and Thin films. She received Young Scientist project fund under FAST TRACK Scheme for Young Scientist by SERB, DST (2012).She has published 9 papers in international/national journals. She presented more than 20 papers in international/national conferences. She was a plenary speaker in many technical programs conducted by various universities in India. She is a fellow of ISTE & IIChE.
Abstract:
ZnO nanostructures are of grand attention in electronic devices, due to their notable optoelectronic behavior. Colloidal synthesis was assisted to produce a variety of ZnO nanostructures. The ZnO nanostructures were studied with XRD, which showed the hexagonal wurtzite structure. FESEM images were helped to study the size and shape of the ZnO nanostructures. The synthesized nanostructures were varied in their size and shape, which was identified from FESEM images. UV-Visible absorption spectra have showed the Characteristic band edge absorption of ZnO. Further ZnO nanostructures/p-Si heterojunction diodes were fabricated using spray technique. We observed good rectifying behavior in the I-V characteristics of the fabricated p-n junction diode. The diode characteristics reveal that the fabricated p-n junction diode plays a suitable role in the field of nanoelectronics.
Padmaja Guggilla
Alabama A & M University, USA
Title: High efficiency organometal halide perovskite devices by spray and brush solution-processing methods
Time : 10:45-11:05
Biography:
Dr. Padmaja Guggilla is an Associate Professor at the Alabama A&M University, USA. Research Interests: Nanophotonics, Biophotonics, SERS, Nanolithography, Pyroelectric materials, Infrared Sensors, Condensed matter physics, Crystal Growth, Thin film and Thick film technology, Composite Films, Nanotechnology.
Abstract:
The recent emergence of efficient organic/inorganic lead halide perovskite compounds have the potential to transform photovoltaics technology, as they are easy to fabricate, have better stability, and possess superior power conversion efficiency. These are very promising in transforming the fields of dye-sensitized, organic, and thin film solar cells. In this research, a versatile solution-processing method called “spray+brush†(SB) has been adopted to achieve a power-conversion efficiency of 3.52% for photovoltaics by incorporating organometal halide perovskite absorbers. It has been observed that this method is more efficient and cost effective than the perovskite devices fabricated by spray (1.95%) and brush (1.17%) methods alone. The SB method of solution processing can be promising for various other organic coatings.
Ruckmani Kandasamy
Anna University (BIT Campus), India
Title: Evaluation of silver nanoparticles incorporated starch/gum based nano-film for food packaging
Biography:
Ruckmani has completed her PhD from Jadavpur University, Kolkata and postdoctoral studies from University of South Florida School of Medicine. She is the director of Centre for Excellence in Nanobio Translational Research (CENTRE). She has published more than 50 papers in reputed journals and has been serving as reviewer of reputed journals. She has received funds to the tune of Rs.800 lakhs from various funding agencies of India.
Abstract:
Plastic is easily available, inexpensive and the common packaging material used in food industry. The major obstacles associated with the usage of plastics are non-degradable, polluting soil and ultimately toxic to the environment. The main objective this work is to develop a biodegradable film based on tapioca starch and guar gum embedded with silver nanoparticles (AgNPs). The preparation process was done by electrospinning method and the final product was characterized with different physicochemical techniques. Green synthesis of AgNPs were successfully carried out using the fruit extract of Limonia acidissima, it act as both reducing and capping agent for stabilization of synthesized AgNPs. By optimizing, the effective preparation (in terms of size) of AgNPs were found at the 100 µl concentration of the extract with the constant volume of 1 mM AgNO3 solution and the resultant AgNPs were characterized using different methods such as UV-visible spectrophotometer, FTIR, TEM, EDAX analysis, Particle size and Zeta potential measurement techniques and zebra fish in vivo toxicity studies. Response surface methodology was performed to investigate the effect of process variables (TS, GG and GLY) on tensile strength (TS), transparency (TR), solubility (SOL) and thickness (THI) of the film. Electrospinning was performed at the optimized film forming solution and their morphology, chemical structure was observed with the TEM and FTIR respectively. The synthesised nano-film exhibited an effective antimicrobial activity against both gram positive and negative bacteria. Our studies concluded that the developed nano-film could be act as a potential non-toxic packing material in food industry.
Nathir Al-Rawashdeh
Jordan University of Science & Technology, Jordan
Title: A comprehensive characterization of self-assembled monolayers of aromatic selenol on Au(111): solvent effects, immersion time effects, and structure
Biography:
Nathir Al-Rawashdeh has completed his PhD at the age of 30 years from Georgetown University and postdoctoral studies from University of Cincinnati. He is a full professor of physical chemistry at Jordan University of Science & Technology-Jordan. He has published more than 40 papers in reputed journals and one book chapter. He has been serving as a refereed of several articles of repute.
Abstract:
Self-assembled monolayers (SAMs) formed by adsorption of 1,2-dibenzyldiselane (DBDSe) and 1,2-diphenyldiselane (DPDSe) on Au(111) substrates at room temperature (RT) and 345 K have been characterized using scanning tunnelling microscopy (STM), X-ray photoelectron spectroscopy (XPS), infrared reflection absorption spectroscopy (IRRAS), near-edge X-ray absorption fine structure spectroscopy (NEXAFS), and low-energy electron diffraction (LEED). Upon adsorption, the Se-Se bonds in DBDSe and DPDSe are cleaved on gold surface to form phenylmethaneselenolate (BSe) and benzeneselenolate (PSe) species, respectively. Although both the PSe and BSe species differ only in their molecular structure with an additional methyl group in BSe, the resulting films reveal noteworthy dissimilarities concerning their adlayer SAM structure and surface morphology. The molecular adlayer structure and orientation of PSe and BSe species were found to depend significantly on the immersion time (IT). For BSe SAMs, the IR data exhibited vibrational modes verifying the adsorption of BSe species on gold surface only for SAMs prepared for ITs longer than 1 h. Furthermore, acquiring STM-images showing individual BSe molecules or any type of order was only achievable for SAMs prepared for 24 h of IT at RT. With increasing the IT, the SAMs exhibited structural changes to a lower density of molecular packing structure. The spectroscopic data also confirmed this structural variation by suggesting upright orientation for PSe-SAMs prepared after short ITs and strongly inclined adsorption geometry for SAMs prepared after long ITs.
Nasim Hadiashar
Santa Clara University, USA
Title: Studying the effects of functionalized multi-wall carbon nanotubes on mechanical and thermal properties of epoxy composites
Biography:
Nasim Hadiashar has completed her Master’s at Santa Clara University. She has been working on different collaboration research project with Thermo Fisher Scientific. Her projects mainly focused on mechanical and thermal properties of nano-composites with different applications.
Abstract:
The goal of this study is to distinguish the effect of functionalized Multi-Wall Carbon Nanotubes (MWCNTs) on thermal and mechanical properties of epoxy composites. The custom-made epoxy resin system is composed of two different kinds of resin one with low viscosity (EPON 828) and the other one with high viscosity (EPON 1001F). The reason why functionalization of MWCNTs has been used is because of poor dispersion and agglomeration structures of CNTs. In order to overcome these obstacles, functionalization is prosperous method to strengthen interfacial adhesion between epoxy resin and MWCNTs. The CNTs were functionalized with carboxyl and diamine groups by different weight ratio of 0.1 wt%, 0.2 wt%, 0.5 wt% and 1 wt% of nanotubes during the process of functionalization. The performance of introduced approach is demonstrated through using thermal and mechanical analysis with different weight ratio. The result has been shown a decent increase on curing temperature and Tg. Based on our TGA results, both amin and carboxyl nano-functionalized samples have shown reduction in the amount of activation energy compared to neat epoxy sample. So it means that adding functionalized CNTs would decrease thermal stabilities and increase degradation efficiencies. In addition, nano-composites with low loading levels of CNTs have been shown the greatest improvement in Tensile strength and Young’s modulus properties. The improvement in thermal and mechanical properties by addition of functionalized MWCNTs would extend the engineering application of epoxy resin composites.
Sayan Bhattacharya
Presidency University, India
Title: Synthesis, characterization and pentavalent arsenic sorption capacity of Cerium Aluminium nanostructured mixed oxide
Biography:
Dr. Sayan Bhattacharya completed his B.Sc. (Hons.) in Zoology from University of Calcutta and completed M.Sc. and Ph.D. in Environmental Science from University of Calcutta. He completed 2 years of Post Doctoral Research in Dept. of Chemistry, Presidency University from September, 2012 to 2014. He has published 22 International peer reviewed Journal Papers, 10 Book Chapters, 40 International Conference proceedings and many National Conference proceedings. He received Young Researcher Award from Govt. of India International Conference and several best lecture and poster awards. He is in the reviewers’ committee of many International journals and in the editorial boards of International journals with high impact factors. He has over 8 years of teaching experiences in University of Calcutta, Visva Bharati University, Rabindra Bharati University, Vidyasagar University, Asutosh College, Bagabazar Women College and Muralidhar Girls' College. He is also a freelance photojournalist and have over 400 international publications in the leading magazines like Lonely Planet, Outlook Traveller, Asian Photography, Better Photography etc.
Abstract:
Arsenic is a metalloid of great environmental concern because of its highly toxic nature and colossal abundance. For the mitigation of arsenic contamination, several technologies such as oxidation–precipitation, coagulation, precipitation, membrane filtration, surface sorption and ion exchange have been applied for the treatment of the contaminated water. Among them, the surface sorption method has been accepted well for its simple operation procedure, low recurring cost, very high removal efficiency, and little by-products. The objective of the present study was the synthesis and characterization of nano-structured cerium aluminium mixed oxide and its arsenic(V) sorption behavior from the aqueous solution. Two solutions of ammonium ceric nitrate and aluminium chloride were mixed in 1:1 mole proportions and the material was prepared by the method of chemical precipitation. The material was characterized in Scanning Electron Microscope, Field Emission Scanning Electron Microscope, Transmission Electron Microscope, Atomic Force Microscope, X Ray Diffraction, Fourier transform infrared spectroscopic analysis and Raman Spectra analysis. Batch method was used for the As(V) sorption kinetics. The isotherm experiments were conducted separately at temperatures 288K, 303K, 318K at pH 7.0 (± 0.2) by batch sorption procedure. The oxide surface was rough and crystalline in nature. From the TEM analysis, it was found that the material was agglomeration of particles of 40–90 nm. The presence of nanoparticles in TEM image could indicate high surface to volume ratio of the material, which can be useful for adsorption purpose. In the study of kinetics of arsenic(V) sorption, the sorption percentage remained almost unchanged upto pH=9.0. After that a small decrease in sorption percentage was observed. The equilibrium data were analyzed by the Langmuir and the Freundlich isotherm models, which are usually used to describe the equilibrium sorption data. It was found that the Langmuir model was the best fit model for the sorption reaction. The Ce-Al binary oxide was very much effective in removing As(V) from water within wide range of pH. The monolayer sorption capacity of the binary oxide was quite comparable to the other As(V) adsorbents reported previously. Thus the present oxide could easily be utilized as a sorbent for arsenic removal from arsenic contaminated ground water.
- Track 8: Electrical, Optical and Magnetic Materials
Track 11: Polymer Technology
Chair
Matthew E. Edwards
AAMU, USA
Co-Chair
Santiranjan Shannigrahi
Institute of Materials Reserach and Engineering, Singapore
Session Introduction
Matthew E. Edwards
Alabama Agricultural & Mechanical University, USA
Title: Physical mechanisms of temperature dependent surface resistivity outcomes of doped nanoparticles, and single-wall or multi-wall carbon nanotubes polyvinyl alcohol thin films
Time : 16:05-16:25
Biography:
Since January 2002, Dr. Matthew E. Edwards has held the position of Professor of Physics in the Department of Physics, Chemistry and Mathematics at Alabama A&M University, Normal, AL and served as Dean, of the School of Arts and Sciences, from 2007 to 2011, a period of 4.5 years. Dr. Edwards is a Condensed Matter Physicist with research expertise in (1) materials of electrooptics, (2) pyroelectric/resistivity/dielectric properties of crystals and nano-particles doped organic thin films, (3) the production of large organic thin films, (4) Solitons wave theory, and (5) STEM Education research and problem solving.
Abstract:
Recently, through using the combined Keithley Model 6517 Electrometer and Keithley Model 8009 resistivity test fixture, we have measured and subsequently reported surface resistivity temperature dependent measurements of in-house, produced pristine, multi-wall carbon nanotubes or silver nanoparticles doped, organic polyvinyl alcohol (PVA) thin films and commercial paper thin films. As dielectric composites, our measurements have shown a characteristic behavior for the surface resistivity as initially decreasing from a beginning value at 22°C, reaching a minimal resistivity and then continuing to increase monotonically as the temperature was raised to 40°C, which is the temperature upper-limit of our measurement system. In this regard, ten different physical mechanisms have been suggested as the cause of such resistivity versus temperature measurements. Of these mechanisms, two are based on classical behavior and the other eight on quantum mechanical behavior. The ten mechanisms, with the first four being of electrode-limited conduction mechanisms kind and the remaining six of bulk-limited mechanisms kind are: 1) Schottky emission, 2) Fowler-Nordheim tunneling, 3) Direct tunneling, 4) Thermionic-field emission, 5) Poole-Frenkele emission, 6) Hopping conduction, 7) Ohmic conduction, 8) Space-charge limited conduction, 9) Ionic conduction, and 10) Grain-boundary-limited conduction. Here, we give the interpretation of our measured results for the causes of the temperature dependent surface resistivity of these composite materials. In addition, for comparison opportunity and greater clarity of our observed surface resistivity results, we give our first time measurements of doped single-wall carbon nanotubes PVA thin films, as they relate to previously measured multi-wall carbon nanotubes thin films.
Santiranjan Shannigrahi
Institute of Materials Reserach and Engineering, Singapore
Title: Polymer-ceramic composite film fabrication and characterization for harsh environment applications
Time : 16:25-16:45
Biography:
Shannigrahi has completed his PhD from Indian Instute of Technology. He is working as a scientist in IMRE, one of teh A*STAR research institute in Singapore. He has published more than 80 papers in reputed journals and has been serving as an editorial board member of repute.
Abstract:
Polymer-ceramic composites are gaining importance due to their high specific strength, corrosion resistance, and high mechanical properties as well as low cost. As a result Polymer composites are suitable for various industrial applications, like automobiles, aerospace and biomedical areas. The present works comprises development of polymer/ceramic composite films and are tested for harsh environment including weatherability and UV barrier properties. The polymer composite films are kept in weather chamber for a fixed period of time followed by tested for their physical, mechanical and chemical properties. The composites films are fabricated using compounding followed by hot pressing. UV visible spectroscopy results reveal that the pure polymer polyethylene (PE) films are transparent in the visible range and do not absorb UV. However, polymer ceramic composite films start absorbing UV completely even at very low filler loading amount of 5 wt.%. The changes in tensile properties of the various composite films before and after UV illuminations for 40 hrs and at 60ï‚°C. The tensile strength of neat PE film has been observed 8% reduction, whereas the remarkable increase in tensile strength has been observed (18% improvement for 10 wt. % filled composites films). The UV exposure leads to strengthen the crosslinking among PE polymer chains in the filled composite films, which contributes towards the incremented tensile strength properties.
Tsuyoshi Uchiyama
Nagoya University, Japan
Title: Development of highly sensitive micro magnetic sensor for biomagnetic field measurement utilizing magneto-impedance element
Time : 16:45-17:05
Biography:
Tsuyoshi Uchiyama has completed his PhD (Ph.D in Engineering) at the age of 27 years from Nagoya University. He now is an Associate professor of Intelligent Device, Department of Electrical Engineering and Computer Science, Graduate School of Engineering.
Abstract:
Magnetization dynamics by pulse excitation in amorphous wire is limited in the surface layer by skin effect due to magnetic rotation. We have constituted highly sensitive linear micro magnetic field sensors utilizing Off-diagonal Magneto-Impedance (MI) effect. Recently we have succeeded in producing pico-Tesla (10-8Oe) resolution MI sensors due to ultra-low intrinsic magnetic noise of amorphous wire. Superconducting quantum interference deice (SQUID) have ultrasensitive, which have been utilized for biomagnetic signals. For example, magnetocardiography (MCG) is a noninvasive technology that measures the magnetic field of the heart. It was developed for general-purpose use as a noninvasive, noncontact diagnostic tool for detecting obstructive coronary artery disease (CAD). The SQUID has been also used to measure the human brain. The application of brain signals detection was developed in various fields. In medicine area, it could be implemented in such as brain injury inspection, diagnosis of neocortical epilepsy, telemedicine or cognitive functions research. And with advances in sensing technology, neuroprosthetics applications based on brain computer interfacing (BCI) could be improved and used to restore damaged hearing, sight or movement. Comparing with the SQUIDs, MI sensor is smaller, lower cost and no need for low temperature operation. The brainwaves of mean N100 and P300 ERP elicited by audio stimuli have been measured by MI sensor. Brainwave measurement results of MI sensor will be presented and the results will be compared with SQUID\\\'s or EEG\\\'s results. The measurement results for MCG by MI sensor also will be presented.
Kazuhisa SATO
Tohoku University, Japan
Title: Strength, elastic and electrical properties of non-stoichiometric materials under various Oxygen partial pressures
Time : 17:05-17:25
Biography:
Dr. Kazuhisa Sato, Ph.D.-Engineering, now is an Associate professor of Fracture and Reliability Research Institute and Graduate School of Environmental Studies. He got his Doctor of Philosophy in Engineering degree (Ph.D.), specialist in fracture mechanics and electrochemistry, at Tohoku University in 2005. And he had worked as a COE Fellow at Graduate School of Engineering, Tohoku University, 2005-2006. Then, he had worked as an Assistant Professor, Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2006-2011. Finally, he has worked as an Associate Professor, Fracture and Reliability Research Institute, Tohoku University, 2011-present. Dr. Kazuhisa Sato’s researches focus on the Fracture mechanics and Electrochemistry in electrochemical devices.
Abstract:
Fracture strength and Young’s modulus of ceria doped with 10 mol.% Gd and 10, 20 and 30 mol.% Y were investigated by means of small punch testing method under controlled the temperature (1073 K) and the oxygen partial pressure (log((p(O2)/atm)= -1.1, 17.5, -21.4, -22.0). Under the reducing conditions, the color of fractured doped ceria specimen changed from pale yellow to gray, it is therefore indicated that oxygen nonstoichiometry affects mechanical properties of the doped ceria. Under the low oxygen partial pressure the Young’s modulus of all the specimens decreased monotonically. The fracture strength, by contrast, increased at log(p(O2)/atm) = -17.5, and under the lower oxygen partial pressure, different variation trends showed each yttria doped cerias with Y contents. The oxygen partial pressure dependence of the fracture strength of doped ceria could be arranged as a function of the reduction expansion of the lattice constant a/a0.
Apisit Chittawanij
National Formosa University, Taiwan
Title: Auxiliary anode on large-area organic light-emitting diode lighting
Time : 17:25-17:40
Biography:
Mr. Apisit Chittawanij was born in Chiang Mai, Thailand on May 7, 1982. He received the B. S. degree and M. S. degree from Thammasat University, Pathumthani, Thailand in 2007 and 2011. Recently, he is studying doctoral program in Institute of Electro-Optical and Materials Science, National Formosa University, Taiwan. His research interest in organic light - emitting diodes includes materials, high efficiency, encapsulation, and long life time and solution process of OLEDs.
Abstract:
Organic light-emitting diodes (OLEDs) have been made for full color displays. However, many issues are involved in the fabrication of large-area OLED panels such as a short circuit, low luminous intensity, nonuniformity of light emission, etc.The nonuniform light distribution is attributed to the limiting conductivity of ITO. Therefore, an auxiliary metal electrode as grid patterned on ITO has been used. In this work, we investigate the feasibility to control the auxiliary metal electrodeeffects in OLEDs by introducing a striped Ag and Au metal layer between ITO/HTL layers. Toprovide guidelines for design optimization of large-area OLED panels such as the spaceand thickness of the patterned metal lines andthe OLED layer thickness are investigated. We have first fabricated the small-area (3x3 cm2) OLED device without auxiliary electrodeinstructureofITO/CuPc (10 nm)/NPB (40 nm)/Alq3(60 nm)/LiF (0.8 nm)/Al (150 nm).The resultshows the luminance, current efficiency and driving voltage of 764 cd/m2, 3.82 cd/A and 9.25 V, respectively, at 20 mA/cm2.Then, to obtainedhomogeneous light, we have deposited auxiliary Ag or Auon ITO, patterned Ag or Auin the form of a gridwith a grid space of 2, 4, and 6mmin device structureofITO/Agor Au(15 nm)/CuPc (10 nm)/NPB (40 nm)/Alq3(60 nm)/LiF (0.8 nm)/Al (150 nm). Itwas seen that the optimal auxiliary electrode material and line space ofAu in linespace 6 mm were obtained. The result shows the luminance, current efficiency and driving voltage of 690 cd/m2, 3.45 cd/A and 7.49 V, respectively, at 20 mA/cm2.The snapshot light emissionofthe 3x3 cm2OLED ofAu line space 6 mm metal gridswere investigated. The average luminance of420.9 cd/m2and uniform luminance of 95% at 10mA/cm2were achieved.This uniform luminance is higher than that of without metal grids about 9.8 %. Finally, the auxiliary electrode of Ag and Au grid wereapplied to the area of 6x6 cm2OLED device.The large-area OLED panel is shown in Fig. 1.The Au inline space 6 nm device shows highthe luminance, current efficiencyand low driving voltage is 203cd/m2, 2.03cd/A and 9.5Vat current density of 20 mA/cm2, respectively.While theAginline space 4nm device shows highuniform luminance of 94%. This indicates that the grid metal layers are expected to be helpful in reducing the sheet resistance of the transparent electrode;we expectedthat our approach can be easily integrated with existing OLED architectures, in particular, large-area device
Najmeh Bolandhemat
Universiti Putra Malaysia, Malaysia
Title: A first-principles study on the structural and electronic properties of CdCr2O4 from density functional theory
Time : 17:40-17:55
Biography:
Najmeh Bolandhemat has completed her M.Sc. in Condensed Matter from Shiraz University, Iran, and is in her 3rd year of PhD in Materials Science in Department of Physics, Universiti Putra Malaysia (UPM). Prior to moving to Malaysia as a PhD student, she was a research assistant in Shiraz University, and Instructor of General Physics, Principle of Modern Physics, and Electromagnetism laboratory in Fars Science and Research branch University as well as Sarvestan University. Currently she is a research assistant in UPM University with a publication in the Journal of Computational and Theoretical Nanoscience (JCTN), and another one in process of being published (accepted) in PhysicaA; statistical mechanics and its applications.
Abstract:
A First-principles Study on the Structural, and Electronic Properties of CdCr2O4 from Density Functional Theory: In this research, we have investigated the structural, and electronic properties of geometrically frustrated Spinel CdCr2O4 with cubic(ð¹Ì…ð‘‘Ì…Ì…3Ì…ð‘š) and tetragonal ( â„ ) structures using a pseudopotential plane wave (PP-PW) method within the local density approximation (GGA).We optimized the crystal structures with the FM and AFM orderings, and computed the electronic properties to investigate the magnetic properties in the geometrically frustrated ferromagnetic and antiferromagnetic spinel CdCr2O4 using density functional theory and understanding of the principles of Quantum espresso in magnetic materials. On the other hand, the effect of magnetism were obtained and analyzed on the basis of charge density distribution, density of states (DOS), and project density of states (PDOS).
N.P.G.N.Chandrasekara
University of New South Wales, Australia
Title: Polyampholytic resins: advances in ion exchanging properties
Biography:
N.P.G.N. Chandrasekara is a PhD student in chemistry of UNSW Canberra, Australia. Her qualifications include BSc (chemistry) sp. with a fist class honors from University of Sri Jayewardenepura, Sri Lanka and has worked as a chemist in charge at Yugadanavi 300MW Combined Cycle Power Plant, Kerawalapitiya, Sri Lanka from 2009-2012. She has involved in water treatment processes as Ultra filtration, Reverse osmosis in both sea water and brackish water and demineralization using resin mix bed. Her current research interests are on water treatment, desalination and on ion exchange processes. She has two major publications and a submitted patent application.
Abstract:
Ion exchange (IEX) resins are commonly available as cationic or anionic resins but not as polyampholytic resins. This is probably because sequential acid and base washing cannot produce complete regeneration of polyampholytic resins with chemically attached anionic and cationic groups in close proximity. The “Sirotherm†process, developed by the Commonwealth Scientific and Industrial Research Organization (CSIRO) in Melbourne, Australia was originally based on the use of a physical mixture of weakly basic (WB) and weakly acidic (WA) ion-exchange resin beads. These resins were regenerated thermally and they were capable of removing salts from an aqueous solution at higher temperatures compared to the salt sorbed at ambient temperatures with a significant reduction of the sorption capacity with increasing temperature. A new process for the efficient regeneration of mixed bead resins using ammonium bicarbonate with heat was studied recently and this chemical/thermal regeneration technique has the capability for completely regenerating polyampholytic resins. Even so, the low IEX capacities of polyampholytic resins restrict their commercial applications. Recently, we have established another novel process for increasing the IEX capacity of a typical polyampholytic resin. In this paper we will discuss the chemical/thermal regeneration of a polyampholytic (WA/WB) resin and a novel process for enhancing its ion exchange capacity, by increasing its internal pore area. We also show how effective this method is for completely recycled regeneration, with the potential of substantially reducing chemical waste.
Edith Yohanna Ishidi
Nigerian Institute of Leather and Science Technology, Nigeria
Title: Physio - Mechanical properties and micro – structural studies of some agro – wastes - HDPE composites
Biography:
Engr. Dr. Mrs. Edith Yohanna Ishidi is a Fellow of the Nigerian Society of Engineers. She has a first and Second Degree in Polymer Engineering ( Federal University of Technology, Owerri, Imo state) and P.hD in Fiber and Polymer Technology, ( Ahmadu Bello University, Zaria) Presently Working for the Nigeria Ministry of Science and Technology, under Nigerian Institute of Leather and Science Technology.
Abstract:
In order to clean up the environment, reduce material cost and produce material with required properties for different applications; coconut shell, groundnut shell and palm kernel nut shell were incorporated into high density polyethylene (HDPE). Two roll mill was used for the mixing of agro - wastes into HDPE polymer matrix. The formulated composites were subjected to different physio - mechanical property tests and micro – structural analysis: Advanced Material Testing Machine, Shore “A†hardness tester and Quanta 200 Environmental Scanning Electron Microscope (ESEM) were used for the test. Properties such as density and percentage water absorption were also studied. The results obtained showed that the agro wastes impacted on the mechanical properties of the high density polyethylene (HDPE) significantly. The composites fabricated showed an improved hardness at 100g filler content and their densities ranged from 0.8g/cm3 to 0.9g/cm3. The densities of the resultant composites could compete favourably with some common building materials. The ESEM showed a fair interaction of the various agro wastes with the polymer matrix. This was evident in the structures formed as a result of the interaction between the two materials.
Ravinder Dachepalli
Osmania University, India
Title: Influence on the dielectric properties of citrate-gel prepared Lithium Nano Ferrites by Aluminum substitution
Biography:
Prof.D. Ravinder is working as a Professor , Department of Physics, Osmania University, Hyderabad, Telangana, India. His research work on magnetic and electrical properties of ferrites, thin films, GMR materials, Cu-Co alloy thin films and nano-materials by pulsed laser deposition, sol gel, citrate precursor method and electro deposition. To his credit, he has published 175 research papers in International Journals. He has been awarded Young Scientist award received by Dr. Abdual Kalam (former president of India), for outstanding contributions in the field of science and Technology, UGC research award, Boyscast by DST ( Department of science and technology), Government of India, JSPS fellowship Japan and Royal Society fellowship, UK. He also visited USA, UK, Canada,Sweden, Ireland, Singapore and Japan for Collaborative Research and invited talks.
Abstract:
Single phase soft ferrite nano crystallites could be synthesized by different methods. We have tried to synthesize Al doped lithium nano ferrites with a chemical formula Li0.5AlxFe2.5-xO4 (where x=0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) using citrate-gel auto combustion technique at low temperature (180oC) to improve their properties. It is a unique combination of the combustion and the chemical gelation processes. They are obtained as dried gel after the successful chemical reaction of these compositions of respective metal nitrate solutions in the midst of citric acid as catalyst. X-ray diffraction (XRD) analysis reveals that all the samples posses a single phase cubic spinel structure. The dielectric parameters such as dielectric constant, loss tangent, AC conductivity of the sample were studied as a function of frequency in the range of 20 Hz to 2 MHz at room temperature using Agilent E4980 Precession LCR Meter. The dielectric constant(ɛ'), loss tangent (tan δ), AC conductivity (σac) of the sample shows a normal dielectric behavior with frequency which reveals that the dispersion is due to the Maxwell-Wagner type interfacial polarization and hoping of electrons between the Fe+2 and Fe+3. On the basis of these results the explanation of dielectric mechanism in Li-Al nano ferrites is suggested.
Norhaniza Yusof
Universiti Teknologi Malaysia, Malaysia
Title: Adsorption of Cadmium (Cd) via adsorptive PES-HFO ultrafiltration mixed matrix membrane
Biography:
Norhaniza Yusof is the Faculty of Petroleum and Renewable Energy Engineering at Universiti Teknologi Malaysia, Malaysia
Abstract:
In this work, novel Polyethersulfone (PES)/hydrous ferric dioxide (HFO) ultrafiltration (UF) mixed matrix membranes (MMMs) were prepared for adsorptive removal of Cadmium (Cd) by varying the weight ratio of HFO:PES in the membrane from 0 to 1.5. The membranes prepared were characterized with respect to chemical structure, surface roughness and structural morphology using FTIR, AFM and SEM-EDX, respectively. The effects of HFO loadings on the membrane pure water flux, hydrophilicity, porosity and Cd adsorption capacity were also studied. The results showed that although the membrane pore size tended to decrease with increasing HFO:PES weight ratio, the membrane water flux was not negatively affected. Instead the membrane water flux was increased with increasing HFO loadings which was attributable to the decreased contact angle value (more hydrophilic), increased porosity and greater surface roughness. Of all the membranes studied, it is found that the MMM prepared from the highest HFO:PES ratio demonstrated the highest Cd uptake capacity and is comparable to other available commercial adsorbents.
Hamed Mirhosseini
Universiti Putra Malaysia, Malaysia
Title: Effect of heat treatment and microwave modification on emulsifying activity and rheological properties and of gum karaya
Biography:
Hamed Mirhosseini has completed his PhD at the age of 27 from Universiti Putra Malaysia (UPM) and postdoctoral flow research at the age of 28 from the same university. He is the associate professor in Faculty of food science and Technology, UPM. He used to work for food industry for more than 6 years when he was doing master research since 1998 to 2004. He has published more than 80 articles in reputed journals and has been serving as an editorial board member and potential reviewers for more than 15 journals.
Abstract:
Gum karaya (GK) is a polysaccharide gum from Sterculia urens tree. It is used as an emulsifier and thickening agent in cosmetics and pharmaceuticals. However, it has very strong swelling properties, high viscosity, and low solubility, providing the restricted applications in food industry. The main objective of this study was to investigate the effects of different heat treatment and microwave variables (i.e. time: 8, 10 and 12 min; power: 700 and 1000 W) on the functional properties of gum karaya (GK) in the aqueous system and oil in water (O/W) emulsion. In this regard, the rheological properties, emulsifying activity, average droplet size, and surface morphology of the native- and microwave-treated gums were analysed and compared. Dynamic oscillatory test indicated that the microwave treated gum karaya had more gel-like behaviour than viscous-like behaviour (G′ > G″) at a relatively high concentration (20% or 20g/100g). When gum karaya was treated by microwave for 8-12 min, both elastic (G′) and viscous (G″) moduli were declined. The native- and microwave treated gum karaya exhibited a shear-thinning (pseudoplastic) behaviour in the aqueous system and O/W emulsion. The results showed that the microwave treated gum karaya had smaller particle than the native gum in the aqueous system. On the other hand, the emulsion containing the microwave treated gum karaya had finer emulsion droplets than the control containing the native gum karaya. This confirmed that the application of microwave treatment led to significantly (p < 0.05) improve the emulsifying activity of gum karaya.
Wancheng Zhou
Northwestern Polytechnical University, China
Title: Improvement of oxidation resistance of carbonyl iron powder through cobalt-coating
Biography:
Wancheng Zhou has completed his Ph.D in 1990 from Department of Materials Science and Engineering at Northwestern Polytechnical University and postdoctoral studies in 1993 from Iowa State University, Department of Materials Science and Engineering. He is a professor in Northwestern Polytechnical University. He has published more than 200 papers in reputed journals.
Abstract:
Carbonyl iron powder is commonly used as an absorber in microwave absorbing coatings. However, the resistances of carbonyl iron powder to oxidation and corrosion are not good. In this work, carbonyl iron powder is coated with cobalt through electroless plating to increase the resistance to oxidation and corrosion. Original and cobalt-coated carbonyl iron powders were characterized by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), vibrating sample magnetometer (VSM), thermogravimetric (TG) and microwave network analyzer, respectively. The original and cobalt-coated carbonyl iron powders were embedded in polyimide to form coatings to study the complex permeability and permittivity before and after heat treatment in air at different temperatures and different time. The results show that the cobalt-coating slightly decreases both the real part and the imaginary part of the permeability of the carbonyl iron powder, and remarkably increase both the real part and the imaginary part of the permittivity of the carbonyl iron powder. After heat treatment at 250oC and 300oC, respectively, the permeability of both coated and non-coated carbonyl iron powders decreases and the permittivity of both coated and non-coated carbonyl iron powders increases. However, the degree of decrease in permeability and increase in permittivity of the cobalt-coated carbonyl iron powder is smaller than those of the non-coated carbonyl iron powder. The cobalt-coating increases the oxidization resistance of the carbonyl iron powder.