6^th Global Experts Meeting on Nanomaterials and Nanotechnology April 21-23, 2016 Dubai, UAE

Biography:

Abu Bakar Suriani received her PhD from Universiti Teknologi MARA,Malaysia together with the Excellent Research Award during the convocation ceremony. Afterwards, she has received various research grants, among them are from Kurita Water and Environment Foundation, Japan, Malaysia Toray Science Foundation, Ministry of Higher Education of Malaysia and Ministry of Science, Technology and Innovation of Malaysia. She was awarded the L’Oreal Malaysia for Women in Science Fellowship Award 2013. She has published more than 25 papers in reputed journals and apart from being actively involved in research, she was also the Head of Physics Department, Faculty of Science & Mathematics, UPSI (2013-2015).

Abstract:

A new and facile one-step method to synthesise graphene oxide/natural rubber latex (GO/NRL) nanocomposite was achieved using an electrochemical exfoliation method. In this method, the fabrication of GO/NRL nanocomposite occurs concurrently with GO production that is intermixed with NRL. This approach is a simple and innovative method that succeeded in producing nanocomposite with better conductivity. The samples were characterized using FESEM, HRTEM, FT-IR, UV-vis, micro-Raman spectroscopy, XRD, TGA, I-V and C-V measurements. The C-V analysis showed that the specific capacitance of the samples prepared via the one-step method was 103.7 Fg-1, much better than those produced via a two-step method (32.6 Fg-1). These results were also consistent with the I-V analysis, in which a higher conductivity value was measured for the one-step method (7.12 x 10-5 Scm-1) than for the two-step method (3.62 x 10-7 Scm-1). In conclusion, the one-step method introduced for the fabrication of GO/NRL nanocomposite is a promising method for implementation in supercapacitor applications.

Biography:

Azmi has completed his PhD from School of Chemistry University of Bristol United Kingdom.. He is currently Research Fellow of Nanotechnology Research Centre at Universiti Pendidikan Sultan Idris (UPSI). He has published more than 25 papers in reputed journals and has been serving as Deputy Director International Affairs Divisition UPSI.

Abstract:

Here is presented a systematic study of the dispersibility of multiwall carbon nanotubes (MWCNTs) in natural rubber latex (NR-latex) assisted by a series of single-, double-, and triple-sulfosuccinate anionic surfactants containing phenyl ring moieties. Optical polarising microscopy, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and Raman spectroscopy have been performed to obtain the dispersion-level profiles of the MWCNTs in the nanocomposites. Interestingly, a triple-chain, phenyl-containing surfactant, namely sodium 1,5-dioxo-1,5-bis(3-phenylpropoxy)-3-((3-phenylpropoxy)carbonyl) pentane-2-sulfonate (TCPh), has a greater capacity the stabilisation of MWCNTs than a commercially available single-chain sodium dodecylbenzenesulfonate (SDBS) surfactant. TCPh provides significant enhancements in the electrical conductivity of nanocomposites, up to ~10-2 S cm-1, as measured by a four-point probe instrument. These results have allowed compilation of a road map for the design of surfactant architectures capable of providing the homogeneous dispersion of MWCNTs required for the next generation of polymer-carbon-nanotube materials, specifically those used in aerospace technology.

Biography:

Assoc.Prof. RNDr. Richard Dvorsky, Ph.D. has completed his Ph.D in applied physics and postdoctoral studies in nanomaterial sciences from VSB – Technical University of Ostrava in Czech Republic. He is the head of Laboratory of Nanoparticulate Materials and Department of Physical Experiments, a member of Czech Physical Society and the Czech Society for New Materials and Technologies. He has published more than 32 papers in reputed journals, chapter in book (Wiley) and is the inventor of several patents in nanotechnologies.

Abstract:

For practical sorption and degradation of pollutants and hazardous substances, it is possible to advantageously apply a new hybrid nanomaterials with a high specific surface area and the photocatalytic efficiency. This work presents the preparation of effective photocatalytic core-shell nanostructures C60-TiO2-C60 by application of a new patented method of controlled sublimation. Nanoparticles of commercial photocatalytic material TiO2 (P25 Evonik) were subjected to cavitation ultrasonic deagglomeration in a liquid dispersion medium of solution of fullerene C60 in toluene. Subsequently, in a strong ultrasonic field a new method for preparing of microemulsion nanoparticle core-shell C60-TiO2-C60 was applied. Their aqueous nanodispersion was solidified by very fast freezing, which prevents the crystalline segregation of the dispersion and preserves homogeneous distribution of nanoparticles in the solid amorphous block. By controlled sublimation at the chosen temperature and pressure molecules of water were removed from the frozen dispersion. Controlling of conditions during sublimation provided suitable speed of the phase interface retreat between ice and vacuum and dispersed nanoparticles were organised under these conditions into lamellar nanoaggregates with high specific surface area. Thus prepared nanomaterial showed during degradation tests a high photocatalytic activity.

Biography:

Ahsanulhaq Qurashi is Assistant Professor in Center of Excellence in Nanotechnology and Chemistry Department, King Fahd University of Petroleum & Minerals. His research interests are Fabrication and Patterning of Zero and one- and Two dimensional Metal chalcogenide Nanostructures, Functionalization of Nanostructures, Fabrication of Micro and Nanoscale Chemical and Biosensors and Nanomaterials for Renewable Energy Applications. He has 30 publications and 3 book chapters to his credit.

Abstract:

The presentation provides insight into a broad spectrum of the state-of-the-art research activities and development that focuses on the functional metal-oxide nanostructured (MOXN) systems. This includes diverse synthetic methods that lead to form these nanostructures, heterostructure formations, their plausible synthetic mechanisms and detailed characterization. A wide range of remarkable physicochemical characteristics will be discussed, covering a number of nanostructured metal-oxides, such as ZnO, In2O3, SnO2, and TiO2, etc. Current efforts on MOXN gas sensors will be discussed. MOXN based sensors, their fabrication and current status will be the primary focus of this presentation. Also at the end, some additional efforts for energy harvesting i.e., hydrogen production will be discussed.

Biography:

Chunfeng Shi completed his PhD in 2008 at Research Institute of Petroleum Processing (RIPP), SINOPEC, and then stayed as an Engineer. Now, he is Professor and the Director of Nanomaterials Research Group at the long term research department in RIPP. His main research field is nanomaterials with catalytic oxidation function. He has published more than 30 papers in reputed journals and has applied for more than 100 patents in catalysis field.

Abstract:

One pot process (involving in situ H2O2 production with simultaneous conversion to organic oxides in the same reactor without refining), is being regarded as more promising technology to the environmental benign production of organic oxides, for its good potentials for ulterior savings in capital and production costs. In this direct oxidation technology, the catalysts used are bi-functional and mostly consist of precious-metal and titanosilicate. At present, the key issue of the above process is to design new catalysts for improving the synthesis efficiency. One of our aims is to design and prepare this nano bi-functional catalyst with intra-particle voids. In this abstract, our own work on bi-functional catalysts especially for their skillful design and characterization will be summarized and introduced concisely, especially our recent advance in developing titanosilicate with intra-particle voids. In particular, recently, we have synthesized a titanosilicate with intra-particle voids being applied in one pot process, which has been prepared by semi-in-situ synthetic method, which involves the addition of precious metal sources and organic-alkaline to reaction mixture under hydrothermal conditions. The synthetic process results in the combination of nano precious metal particles with titanosilicate framework, and redistribution of active Ti species throughout the crystals, thereby enriching the surface of hollow crystals with catalytic species. Besides easily separated and recycled, the bifunctional catalyst may be a feasible application in industries in the near future. At this meeting, we will briefly summarize our own work on this new type of nano titanium silicalite with precious-metal being combined and hollow structure, especially for their characteristic and catalytic performance, as well as our recent advances in developing the bi-functional titanosilicate with intra-particle voids.

Biography:

Avinash Baji has completed his PhD from the University of Akron (Akron, Ohio) and Postdoctoral studies from the University of Sydney. He joined SUTD as an Assistant Professor in 2013. His current research interests include fabrication of electrospun fibers for bio-duplication of dry-adhesion mechanism of natural fibrillar structures. He has authored over 30 journal articles, with additional papers in conference proceedings. Some of these research papers are highly cited with three recent publications specially featured in (i) Lab Talk, nanotechweb.org; (ii) the Top 25 Hottest Articles by Composite Science and Technology (CST); and (iii) List of Most Downloaded CST Articles.

Abstract:

Natural materials and composites display superior mechanical properties compared to its constituent materials. For example, bones and shells although composed of brittle minerals and soft proteins display high toughness and strength. This is attributed to the organization and structuring of their constituent materials within the composite. Mimicking the size, geometry and the structural design of natural materials can be useful to design and develop new class of synthetic materials. Recently, researchers have used electrospinning to fabricate bio-inspired materials that have found applications in wide variety of fields. For instance, electrospinning is used to fabricate fibers with controllable composition and arrangement such that they closely mimic the natural hierarchical structures for development of functional fibers and membranes that display special wettability. In this study, we used electrospinning to fabricate hierarchical fibrous structures for dry-adhesive applications. These fibers mimic the dry-adhesive mechanisms prevalent in nature, which enables certain animals and insects to scale vertical walls. Briefly, the fibers are electrospun on the surface of a porous anodized aluminum oxide template (AAO). The AAO template with the fibers is then heated above the glass transition temperature of the polymer. This enables the polymer to flow into the pores of the AAO resulting in the formation of sub-nano structures on the surface of the fibers. These hierarchical structures closely mimic the ‘hairy’ structures found on the feet of certain animals. We then investigate the shear and normal adhesion performance of these samples using a tensile tester and atomic force microscope (AFM). The normal and shear adhesion results reveal that these samples adhere to various surfaces including glass and metals. The durability of the adhesive was also verified by repeating AFM adhesion measurements over 1000 consecutive cycles. The normal pull-off force was seen to be constant over 1000 attachment-detachment cycles. These results show the potential of using these electrospun fibers for dry-adhesive applications.

Biography:

Ali Al-Radhi has completed his Bachelor in Mechanical Engineering from Australian College of Kuwait (ACK). He has completed an internship at Kuwaiti Institution of Scientific Research (KISR). He workes on nano coating for enhancing buildings energy efficiency.

Abstract:

The contribution from buildings towards energy consumption has steadily increased reaching figures between 20% and 40% in developed countries for both commercial and residential buildings. In countries with hot climate such as Kuwait, the major elements that causes such increase in energy consumption is the air conditioning system along with the type of glazing used for buildings. This is because the inner temperature increases from infrared heat radiation passing through the windows. For this reason, coating the window using nano technology would help in managing heat generated from radiations. In this work, a study was conducted experimentally on a 6x6x6mm double glaze window using a 500W heat source to determine the technical feasibility of applying single layer commercial nano coating, multi layer commercial nano coating, and commercial 30% shaded film. The results showed that applying a single layer of nano coating material reduced the overall heat transfer by roughly 7°C while with multi layer case; the heat transfer reduction was only 1.5°C less than the single layer scenario. The 30% shaded film has shown poor result, as it reduced only 1°C compared with the original sample. The final temperatures for the original sample, single layer nano coating, multi layer nano coating, and 30% shaded film are 40, 33.235, 31.535, and 38.644°C respectively.

Biography:

Davoud Dastan has completed his MSc from Savitribai Phule Pune University and is currently a PhD student in the same University. He has published more than 15 papers in reputed journals and also participated in more than 30 international conferences.

Abstract:

Organic field effect transistors (FET) have been prepared on flexible substrates. A gate dielectric layer consists of organic and inorganic composite materials have been used for the enhancement of electrical characteristics of the FET. Nano-particulates titania were embedded into poly vinyl alcohol (PVA) and ammonium dichromate. The cross-linking of PVA with ammonium dichromate (PVA-ad) was performed with the exposure of ultraviolet (UV) irradiation. The solution of PVAad+TiO2 was spun onto rigid substrates. The gold contacts were made using thermal evaporation on top of the samples. In order to measure the electrical features of FET’s, an active layer of copper phthalo-cyanine (CuPc6) was deposited andthe output characteristics of the devices were investigated using semiconductor parameter analyzer. The surface morphology of the prepared FET’s was studied by means of Atomic Force Microscopic (AFM).The output characteristics results of devices exposed to UV light revealed higher mobility, on/off ratio, and threshold voltage with respect to the pristine samples.Moreover, devices with PVAad+TiO2 as gate dielectric exhibited better electrical performance compared to those with PVA-ad as gate dielectric. The AFM images illustrated higher surface roughness for irradiated devices. Additionally, granular and uniform morphology with grain sizes in the range of 20-50 nm were observed for FET devices.

Biography:

Tariq Aqeel is a member of the Royal Chemical Society ( MRCS UK) has completed his MSc at Exeter University and PhD from University College London (2004-2008 UK) and became an assistant professor of Inorganic Chemistry at the Public Authority of Applied Education and Training (PAAET Kuwait). His research interests are in synthesizing mesoprous inorganic materials, nanoclusters and nanoparticles, study their optical, sensing and sorption properties. He has published 2 papers so far.

Abstract:

We report the synthesis of crystallite mesoporous tin dioxide framework that contains nano gold clusters confirmed and analyzed by BET, XRD, HRTEM, XPS and UV-visible. The material has a surface area of 97 m2g-1, average pore sizes of 2.7 nm and pore volume of 0.08 cm3g-1. We believe that initially the nano gold clusters occupy the pores of the mesoporous tin dioxide, which restricted their further growth, then some of which diffused to the walls during the heat treatment. The average nano gold clusters are 1.2 nm. The material has a band gap of 2.9 eV that been determined using KubelKa- Munk function. This material would be used for gas sensing and/or optical catalysis.

Biography:

Reza Sadr is associate professor in the mechanical engineering program at Texas A&M University Qatar. His research expertise is in experimental methods in thermo-fluid sciences with focus on advanced energy efficient systems. He received his PhD from University of Utah in 2002. Before joining Texas A&M in 2008, he moved to Georgia Institute of Technology, Atlanta, as research scientist, and then to Georgia Tech Savannah as visiting assistant professor. His current research addresses microfluidics, droplets and sprays, environmental fluid mechanics, and supercritical thermo-fluids. He is a member of American Society of Mechanical Engineering and American Physical Society since 1998.

Abstract:

Colloidal suspensions of nano-sized particles (less than 100nm) dispersed in a fluid, commonly called nanofluids, have shown potentials as industrial fluids due to their enhanced thermo-physical and chemical characteristics. In spite of numerous reports on the anomalous enhancement in thermos-physical properties of nanofluids, there is still no solid theoretical explanation for such enhancements. Present work details various research works conducted at Texas A&M at Qatar, ranging from fundamental at nano-scale to large-scale applications of nanofluids, to better understand these phenomenon. Brownian motion of the particles in the fluid and its effect on the flow field is first discussed. Measurements of the physical and optical properties of nanofluids, such as viscosity, surface tension, refractive index, and optical transmittivity are then reported for suspensions with varying particle concentrations. Results of heat transfer experiments for nanofluids in a microchannel and for a scaled-down industrial heat exchanger is then reported. The results show no anomalous heat transfer enhancements, only marginal enhancement in heat transfer that is in agreement with effective medium theory. Further, experiments to study near-wall velocity at nanoscale are then discussed. Results of these experiments help better understanding of the reported viscosity enhancement for these fluids. Possibility of using nanofluids as drilling fluids, at pressures up to 100 MPa, is also discussed. Finally measurement campaign to investigate spray characteristics for suspensions of nanoparticles in Jet A-1 and an alternative Gas-to liquid (GTL) jet fuels are reported.

Biography:

Mehrnoosh Atashfaraz has completed her PhD at the age of 29 years from Tehran University and postdoctoral studies from Tohoku University School of Engineering. She is researcher, oil and gas expert in National Iranian Oil Refiining and Distribution Company. She has published more than 5 papers in reputed journals

Abstract:

Indium oxide (In2O3) nanoparticles were successfully synthesized via simple rapid hydrothermal method at 400 and 450 C under pressures of 25 and 30 MPa within 10 min. It was found that the highest temperature (450 C) and lowest pressure (25 MPa) condition was preferable to obtain pure cubic crystals of In2O3, because of the higher dehydration rate at 450 C and lower water concentration at low pressure (25 MPa). Moreover, we succeeded in the synthesis of hydrophilic amino-acid-modified In2O3 nanoparticles by the same method at 450 C and 25 MPa within 10 min. 5-Aminovaleric acid was used as the modifier. Changes in the surface properties of the nanoparticles by surface modification were observed by Fourier transform infrared spectroscopy, thermogravimetric analysis, zeta potential, and transmission electron microscopy (TEM), which demonstrated that the reagent chemically bound onto the surface of the In2O3 nanoparticles. The TEM images show that the morphology and size of the surface-modified nanoparticles were spherical with a diameter of 31 nm, respectively. The surface-modified nanoparticles were water dispersible; their isoelectric point shifted to a low pH range because of the nature of the carboxyl group contained in the structure. The synthesized unmodified and surface-modified In2O3 nanoparticles show a unique, wide-range blue–red light emission after excitation at 300 nm at room temperature. These results suggest that In2O3 nanoparticles could have significant potential for applications in optoelectronic devices.

Biography:

Cavus Falamaki obtained his PhD in Chemical Engineering in 1996 from the Amirkabir University of Technology. He was also a PhD exchange student in ETH, Switzerland, during the period 1995-1996. He serves now as the Research Deputy of the Mahshahr Campus of the Amirkabir University of Technology. He has served for more than 16 years as a consultant for various chemical companies in Iran. He has published more than 52 papers in reputed journals, run 9 industrial projects and won two national prizes. He has been the elected first Head of the Central Laboratory of the Amirkabir University of Technology.

Abstract:

TiO2 has been the focus of enormous research activities during the last two decades. In the form of titania nanotube aligned arrays (TNA), the material is now a prominent candidate for the production of hydrogen from water through photo-catalysis. Aiming at the use of sunlight as the sole source of energy, great efforts have been done by the researchers to decrease the band-gap of TNA’s while keeping the recombination process minimal. Here, we will present our latest discoveries regarding the improvement of the photo-catalytic properties of TNA’s through the implementation of multiple doping or use of special quantum dot decorations. Multiple doping (three dopants) through a special one-step chemical route may result in a synergetic effect leading to the reduction of band-gap energy. Special novel quantum dot decorations may also lead to similar highly enhanced photo-catalytic behaviors which will be alluded to in the presentation.

Biography:

Rajesh Nivarti Gacche is a Professor and Head at the Department of Botany, Tumor Biology Laboratory, S.R. T. M. University, India. He has twenty years of teaching & research experience to post graduate classes of Biotechnology, Microbiology and Botany. Published over 75 research papers in the area of “Biomedical Research” in reputed International journals with h-index of 16 and an Impact factor range of 0.5 -10.18. He also has 2 patents to his credit.

Abstract:

Synthesis of metal nanoparticles for improving therapeutic index and drug delivery is coming upas an attractive strategy in the mainstream of cancer therapeutic research. In the present study, curcumin capped copper nano-particles (CU-NPs) were evaluated as possible inhibitors of in vivo angiogenesis, pro-angiogenic cytokines involved in promoting tumor angiogenesis along with inhibition of cell proliferationand migration of breast cancer cell line MDA-MB-231. The anti-angiogenic potential was assessed using in vivo chorio-allantoic membrane (CAM) model. 3-(4, 5-Dimethylthiazol-2-yl)-2, 5-diphenyltetrazoliumbromide (MTT)-based cytotoxicity assay was used to assess the effect of CU-NPs against proliferation of breast cancer cell line. The wound healing migration assay was used to evaluate the effects of CU-NPs onthe migration ability of breast cancer cell line. Native curcumin (CU) was used as a reference compoundfor comparison purpose. The result of the present investigation indicates that CU-NPs could not demonstrate impressive anti-angiogenic or anticancer activities significantly as compared to native CU. Thepossible mechanisms of experimental outcomes will be discussed in the light of the methods of nano-particle synthesis in concert with the current state of the art literature.

Biography:

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Abstract:

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Biography:

Nagendra Prasad Pathak is an Associate Professor at IIT Roorkee. He has received his PhD degree in Millimeter-wave Integrated Circuits from IIT Delhi, in 2005. He held the position of Post-doctoral research fellow at Tohoku Institute of Technology, Sendai, Japan and CARE, IIT Delhi. He is serving as Vice Chairman of IEEE Microwave Theory and Techniques Society (MTT-S) Uttar Pradesh. He has guided 6 PhD, 26 MTech dissertations and published more than 85 papers in reputed international journals and conferences and has one US patent to his credit. His current research interests are RFICs and Nanoplasmonics.

Abstract:

Plasmonics is a rapidly evolving subfield of nanophotonics that deals with the interaction of electromagnetic wave with surface plasmons, which are collective oscillations that occur at the interface between metal and insulator. Copper interconnects finds limitations (below 100nm regime) because of the reduced circuit size as the power dissipation per unit area is sufficient to raise the local temperature of silicon chip substrate up to the silicon’s melting point. Optical waveguides can provide an appropriate alternative, but failed due to its operation in TE or TM modes where each mode has some cut-off condition depending on the physical size of the waveguide. Due to this cut-off condition, the waveguide dimensions cannot be reduced beyond a certain limit. Further reduction in the size of optical waveguide dimensions are possible only if one can find a mode (other than higher order waveguide modes) which can exist and propagate even when the waveguide is operating under below cut-off conditions of dominant fundamental mode. Plasmonic waveguides are attractive as they support an electromagnetic mode which can carry signal through the waveguide even when operating under below cut-off conditions of dominant mode. In this talk, emphasis will be given to understand fundamental concepts in the design and analysis of multiband and multifunctional nanoplasmonic integrated circuits for the realization of concept of nanoscale wireless links. The modeling of MIM waveguide and its variants along with its applications in the design of multiband resonators, filters, couplers and diplexers will be covered in this presentation.

Biography:

Siva Prasad Peddi has completed his PhD from Osmania University and since then has been serving various institutions indulging in both teaching and administration. He was the Director of an e-learning portal in India before he shifted to Aljouf University in Saudi Arabia. He has authored text books and has many publications in reputed journals and has been serving as an Editorial Board Member of various research journals of repute.

Abstract:

Rare earth doped nanoparticles have been identified to possess excellent crystallographic stability with characteristics that suit their utility in vast applications such as waveguides, coating material under severe reactive conditions, oxide hosts in lasers and their fluorescence properties have been identified to possess multitude of industrial applications. Yttrium oxide is one of the most passable of the yttrium compounds, which finds itself in the midst of fabrication from solid state laser ceramics to high temperature superconductors. RE3+:Y2O3 nano particles have been prepared using samarium and neodymium for the dopant RE3+. Rare earth doped yttrium oxide nano particles were synthesized successfully using a simple and low cost modified precipitation method using urea. Characterization of nanoparticles using XRD indicated the formation of RE3+:Y2O3 nano particles in various crystalline orientations after verification where all the impurity peaks that existed with the powder in its dry form at 300°C vanished after calcination at 900°C. The mean size of the particles has been found to be between 80-150 nm. The mean crystallite size ranges have been estimated from the broadening of diffraction peaks and the results were found to be in agreement with size analysis measurement.

Biography:

Abstract:

Silver and copper nanoparticles are known to have inhibitory, bactericidal effects and catalytic degradation effect on methyl red dye. Several methods about synthesis of nanoparticles have been reported including chemical and physical methods which are associated with environmental concerns. In present study, here, we report biosynthesis of silver and copper nanoparticles using Duranta erecta fruits extract at ambient temperature and pressure. Biosynthesis of nanoparticles is cheap, low cost, non-toxic, high-yield and eco-friendly method. Size and reduction time of Ag and Cu NPs were compared with chemically synthesized hydrazine mediated Ag and Cu NPs. Nanoparticles formation was confirmed by UV/visible spectrophotometry due to the surface plasmon resonance, in which silver show at 447 nm while copper at 597 nm. Percent reduction of metal salts was determined using atomic adsorption spectrometry. The size, shape and morphology of the synthesized nanoparticles were examined using powder XRD and FE-SEM respectively. EDX analysis was performed showing strong signal peak for elemental silver and copper also confirm the formation of nanoparticles. The biosynthesized silver nanoparticles show excellent antibacterial activity and synergistic effect with antibiotic gemifloxacin against human pathogen gram positive, Staphylococcus aureus and gram negative, Escherichia coli as compared to copper nanoparticles. The prepared nanoparticles exhibit excellent methyl red photocatalytic degradation activity proved by decrease in absorbance with time. Besides these, the biologically synthesized silver and copper nanoparticles also show excellent 1,1-Diphenyl-2-picryl-hydrazyl (DPPH) free radical scavenging activity.

Biography:

Mehrnoosh Atashfaraz has completed her PhD from Tehran University and Postdoctoral studies from Tohoku University School of Engineering. She is researcher, oil and gas expert in National Iranian Oil Refining and Distribution Company. She has published more than 5 papers in reputed journals

Abstract:

Indium oxide (In2O3) nanoparticles were successfully synthesized via simple rapid hydrothermal method at 400 and 450C under pressures of 25 and 30 MPa within 10 min. It was found that the highest temperature (450C) and lowest pressure (25 MPa) condition was preferable to obtain pure cubic crystals of In2O3, because of the higher dehydration rate at 450C and lower water concentration at low pressure (25 MPa). Moreover, we succeeded in the synthesis of hydrophilic amino-acid-modified In2O3 nanoparticles by the same method at 450C and 25 MPa within 10 min. 5-Aminovaleric acid was used as the modifier. Changes in the surface properties of the nanoparticles by surface modification were observed by Fourier transform infrared spectroscopy, thermogravimetric analysis, zeta potential, and transmission electron microscopy (TEM), which demonstrated that the reagent chemically bound onto the surface of the In2O3 nanoparticles. The TEM images show that the morphology and size of the surface-modified nanoparticles were spherical with a diameter of 31 nm, respectively. The surface-modified nanoparticles were water dispersible; their isoelectric point shifted to a low pH range because of the nature of the carboxyl group contained in the structure. The synthesized unmodified and surface-modified In2O3 nanoparticles show a unique, wide-range blue–red light emission after excitation at 300 nm at room temperature. These results suggest that In2O3 nanoparticles could have significant potential for applications in optoelectronic devices.

Biography:

Yeojoon Yoon has completed his PhD from Yonsei University and Postdoctoral studies from Korea Electronics Technology Institute. He is working on the application of graphene-based materials to water treatment technologies such as adsorption, catalytic oxidation, and membrane process. He has published more than 20 papers in SCI journals.

Abstract:

Larger graphene sheets can reduce the contact resistance caused by the number of graphene-graphene contacts and enhance the electrical conductivity. Furthermore, larger graphene sheets can be more effective in load transfer while graphene is used as a reinforcement filler in composites. Previous studies, graphite oxide synthesized by the conventional Hummers’ method was exfoliated through sonication process for obtain single layer graphene oxide. However, its lateral size was less than 10um. Additional omnidirectional mechanical energy input, such as sonication, reduces the lateral size of graphene oxide sheets. This lateral size reduction of single layer graphene oxide attribute to the further weakening of graphene sheets resulting from the hydroxyl and epoxy sites functionalized edge and plane of graphene sheets. Here, we describe a facile method to prepare large-area single layer graphene oxide, which uses the exfoliation of graphite oxide in a Couette-Taylor flow reactor. We found that the formation of Taylor vortex flow with shearing stress in the reactor is effective for exfoliation of graphite oxide, which allows for the production of a more than 100μm in lateral size single or few-layer graphene oxide platelets at a high yield of 90% within 60 min of reaction time. The properties of fabricated graphene oxide was examined by field emission scanning electron microscope, Raman spectra, atomic force microscope, x-ray photoelectron spectroscope and x-ray diffraction.

Biography:

Su Yeon Choi received her PhD degree in 2015 at INHA University and joined the Korea Electronics Technology Institute as a Postdoctoral fellow. Her thesis focused on the self-assembled nanostructure of conducting polymers in thin films and solution state. Her current research focuses on the development of graphene-based nanocomposites for various applications such as sensor, photocatalyst and supercapacitor.

Abstract:

We report a simple but strong method to enhance sensitivity and responsibility of graphene oxide (GO) by forming a self-corrugated surface of GO. The self-corrugated surface was formed by the reaction of graphene oxide with Gallium oxide. The surface of GO is more corrugated with the concentration of Gallium oxide during the dry process of GO solution. The GO structure was distorted due to the three hydroxyl groups of Gallium oxide to replace the existing GO structure. The properties of synthesized GO was investigated by scanning electron microscope, energy dispersive spectroscopy, X-ray diffraction, Raman spectra and atomic force microscope, respectively. This GO composite have superior advantages over normal Gallium oxide for a higher organic removal property and responsibility for water treatment.

Biography:

Mohd Yaseen Lone has completed his MSc and MPhil with first division from Barkatullah University Bhopal (MP), India. Currently, he is pursuing his PhD in Physics (Nanotechnology) from Department of Physics, Jamia Millia Islamia, New Delhi, India. His area of interest is synthesis, characterization of single wall carbon nanotubes and their sensor applications

Abstract:

In the present study, single wall carbon nanotubes (SWCNTs) have been successfully grown on Fe based catalyst silicon substrate. The plasma enhanced chemical vapor deposition (PECVD) technique has been used to grow single wall carbon nanotubes (SWCNTs). The Fe catalyst has been deposited by RF–sputtering technique. The thickness of deposited catalyst layer is in a few nanometer range. The catalyst play a great role in controlling the diameter distribution of SWCNTs. The hydrogen was used for the pretreatment of the iron deposited catalyst substrate. The acetylene was used as the carbon source gas. The growth temperature and time has been kept 6500C and 10 min respectively. As per the requirement, parameters have been optimized accordingly. The obtained SWCNTs have been characterized and properly investigated by various techniques like FESEM with EDAX, HRTEM, and Raman spectroscopy.

Biography:

Namrata Tiwari is currently a final year student pursuing an Integrated Dual Degree course that incorporates a BTech in Bio-engineering and MTech in Bio Medical Technology at the School of Biomedical Engineering, Indian Institute of Technology- Banaras Hindu University (IIT (BHU)), Varanasi, India. She has worked as a research intern in the Defence Institute of Technology (DRDO), Pune under the supervision of Dr. H S Panda, Assistant Professor, Department of Material Engineering, Pune and has contributed in a commendable research work.

Abstract:

There is an increased need of materials that can effectively help in the process of cancer diagnosis. Use of luminescent carbon quantum rods in biological investigations has increased dramatically over the past several years due to their unique size-dependent optical properties, low cytotoxicity and good biocompatibility. Photoluminescent carbon based materials, which act as bio label, can be used as fillers in a polymer/inorganic matrix to synthesize a composite material for required application. Layered double hydroxide (LDH) was used as the matrix material as it easily incorporates the bio markers/labels and helps in decreasing the toxic effect the particles might have. We have synthesized a hybrid material consisting of Layered Double Hydroxide (LDH) as matrix and CQRs as filler. CQRs were synthesized using electrochemical method in which graphite rod electrodes were dipped in a basic solution. LDH, which is a multilayered material, was then formed. To further enhance the properties of LDH, CQR was incorporated in situ in it by co- precipitation method in which we took 10 ml of CQD solution in 60 ml of water and adding Mg and Al salt drop wise maintaining the pH at 11 and then heating at 60 degree for 24 hrs. Then, centrifugation was done and the sediment was dried and characterized for obtaining its properties. The composite prepared was characterized by XRD and TEM techniques. The other techniques used were SEM, FTIR, Raman spectroscopy, cell culture, T to T1 relaxation. Further, tests on cytotoxicity have been performed to test the compatibility with living cells.

Biography:

Pankaj Gupta received his MSc degree from Malviya National Institute of Technology, Jaipur, in 2011. Presently he is working as Senior Research Fellow of Ministry of Human Resource Development, New Delhi.

Abstract:

In this study, a convenient, low cost and sensitive electrochemical method based on a disposable gold nano-particles modified screen printed carbon sensor (Au-NPs/SPCs) is described for the simultaneous determination of dopamine (DA) and 5-hydroxyindole acetic acid (5-HIAA). Field emission scanning electron microscopy (FE-SEM) and electrochemical impedance spectroscopy (EIS) were used to characterize the surface morphology of the Au-NPs modified SPCs. The electrochemical measurements were carried out using square wave voltammetry and cyclic voltammetry. The modified electrode exhibited good electro-catalytic properties towards the oxidation of DA and 5-HIAA and the electrochemical potential difference between DA and HIAA was measured to be 230 mV, which was large enough to determine DA and 5-HIAA individually and simultaneously. The anodic peak current of DA and 5-HIAA were found to be linear in the concentration range of 0.2–100 µM and 0.5-500 µM with the detection limit of 8 nM and 22 nM, respectively. The effect of common metabolites presents in human urine such as ascorbic acid, uric acid on electrochemical response of DA (10 µM) and 5-HIAA (20 µM) were also analyzed. It was found that 10-fold concentration of ascorbic acid does not interfere with the determination of DA and 5-HIAA, while higher concentration of UA (more than 60 µM), anodic peak signal for 5-HIAA start to broaden, but the peak of DA remained same. The analytical utility of developed protocol was evaluated by performing the recovery experiments in human urine and plasma samples of healthy persons, showing the recovery in the range 99.20-101.33%.

Biography:

Prashant Jindal has been working extensively in the area of characterization of polymer based nano-composite materials. He completed his PhD in 2014 from Panjab University, Chandigarh, India. He has many publications in journals like Composites Part B: Engineering, Materials & Design, etc.

Abstract:

In this paper, we aim to enhance the static and dynamic mechanical strength of Acrylonitrile-Butadiene-Styrene (ABS) terpolymer by constituting it with small compositions of Multi Walled Carbon Nanotubes (MWCNTs). Composites of ABS/MWCNT were fabricated with various MWCNT compositions (1, 3, 5, 7, 10 wt%) in ABS. These were then characterized to obtain quasi-static mechanical properties like hardness and elastic modulus using nano-indentation technique. It was observed that hardness and modulus for 10 wt% MWCNT composition in ABS/MWCNT composites were enhanced by 49% and 61% respectively in comparison to pure ABS. The visco-elastic nature of ABS/MWCNT composites was also investigated at nano scale using Dynamic Mechanical Analysis (DMA). Properties of ABS/MWCNT composites and pure ABS specimen were compared in dynamic mode for a loading frequency upto 200 Hz and it was observed that modulus of 10 wt% ABS/MWCNT composite was consistently higher by nearly 58% to 75% (upto 200 Hz) in comparison to that of pure ABS. The maximum strength for these composites under variable loading frequencies was achieved at lower loading frequencies, which indicated that properties of these composites enhanced up to loading frequencies of 100 Hz. Therefore, significant enhancement in mechanical strength of ABS was observed by composing minor compositions of MWCNTs (upto 10 wt%) without noticeable alteration in their weights, hence improving the prospects of ABS being used for engineering applications.

Biography:

Hanan Abd Ali Thjeel Al-Ogaili has completed her Master’s and BSc from Baghdad University in Physical Science. Now, she has scholarship to complete PhD in United Kingdom. She is a tutor at Wassit University College of Science in Physics Department for ten years. She has published more than 8 papers in reputed journals and has been working in Nanotechnology Group in the University of Baghdad.

Abstract:

In this work, the zinc sulfide (ZnS) nanoparticles were synthesized by simple chemical route at room temperature and using zinc chloride powder (ZnCl2) and sodium sulfide powder (Na2S) as basic materials, ZnS nanocrystals were measured by X-ray diffraction (XRD), ultraviolet–visible spectroscopy (UV-VIS) and fluorescence (PL) spectrophotometry. The optical properties and structure of nanoparticles had been investigated. The results showed high absorbance in near UV regions of spectrum, while the grain size of ZnS nanoparticles had calculated to be approximately (1.94- 2.75) nm from XRD test and optical energy gap of the nanoparticles was found to be in the range of 3.8eV. Photo luminescence (PL) spectra of the samples had illustrated blue-light emission when the samples were excited by UV light with wave length at 250 nm. Also, the PL results observed that the bands emission (multiple peaks) were broad and strong and were centered at three positions at 310 nm, 350 nm and 400 nm.

Biography:

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Abstract:

Silver nanoparticles were successfully prepared by eco-friendly and cost effective aerial roots of Rhaphidophora aurea (Linden ex Andre) extract which act as a reducing agent by green synthesis method. The visual color change from colorless to yellow to brown was helpful in confirmation of AgNPs formation. UV Visible (UV-vis) spectroscopy was used to follow the gradual formation of NPs and power X-ray diffraction (XRD) confirmed the face centre cubic crystal structures in software in JANA2006, Edit+3. XRD studies revealed a gradual crystal-lite size reduction at different molar ratios of extract silver salt. The crystallite size was calcu-lated using Debye-Scherer’s formula and found to be in the range 30 nm. Morphology and characterization of AgNPs was done by using FESEM, HRTEM, FTIR and EDAX techniques. FESEM and HRTEM analysis showed that the morphology of the obtained AgNPs was spherical shaped which can be used in variety of biomedical and pharmaceutical applications. The antibacterial actives and mechanism of silver nanoparticles are examined using Escherichia coli, Streptococcus mutants, Bacillus subtilis and Pseudomonas aeruginosa respectively by analyzing the growth permeability and morphology of the bacterial cells following with AgNPs.

Biography:

M A Jafarov was a student in Faculty of Physics, Baku State University, Baku, Azerbaijan from 1977 to 1982. He received the M.Sc. degree (with highest Honors) from the same university in 1982. He was a Post-graduate student in Institute of Photo-electronics, Azerbaijan National Academy of Sciences, Azerbaijan from 1982 to 1986. He received the PhD degree in the field of Semiconductor Physics from the same institute in 1989 and was a D.Sc. degree in the field of “electronic processes in single crystals of any A2B6 type compounds and in films on their basis, chemically deposited from solution” and is a Professor since 2010.

Abstract:

The II–VI semiconductor nano-crystals exhibit interesting properties and their emission spectra is narrow (spectrally pure) and the emission color is simply tuned by changing their size. As the nano-crystal size decreases, the energy of the first excited state decreases qualitatively following a particle-in-a-box behavior. This size dependence and the emergence of a discrete electronic structure from a continuum of levels in the valence and conduction bands of the bulk semiconductor result from quantum confinement; hence, semiconductor nano-crystals are referred to as quantum dots). Nanostructure ZnCdS thin film was fabricated onto cleaned glass substrates with thickness 100 nm by flash deposition technique. Cleaning of substrate is important in fabrication of thin films, because it greatly influences the properties of the films deposited on it and has strong effect on the adhesion properties of the deposited films. The electrolyte was prepared by dissolving 6mM CdCl2, 5mM CdSO4, 0.15mM Na2S2O3 and 0.2M NaOH in water. Due to the low solubility of Na2S2O3 continuous heating and stirring for several hours is required. The pH of the final electrolyte was adjusted to 3.5 with H2SO4.. After preparing the nPS samples by using the Electrochemical etching process, the Nanostructure ZnCdS thin films with thickness 100 nm were deposited on the porous silicon layers; this is achieved by using Flash evaporation technique for preparation Nano-ZnCdS/PS hetero-junction. The crystallographic structure of films was analyzed with x-ray diffractometer using Cu-Kα (λ=1.54Å) radiation. Diffraction patterns have been recorded over the 2θ range of 20o to 60o. The surface morphology and roughness of prepared samples were obtained by atomic force microscopy (Scanning probe Microscope type AA3000), supplied by Angstrom Advanced Inc. in non-contact mode. The transmission spectrums of Nanostructure ZnCdS thin film was obtained using UV-Visible recorder spectrophotometer in the wavelength range (200-1100) nm. The electrical measurement for Nano-ZnCdS/PS hetero-junction, which was prepared at constant substrate temperature with different etching times of nPS layers, includes current-voltage characteristic measurements in the dark and under illumination conditions.

Biography:

Michaela Jakubickova is PhD student from Technical university of Liberec. She is in the third year of study. She focuses on photocatalysis in her disertation work. She had a traineeship in the Ireland like researcher in microbiology laboratory. She has published more than 5 papers reputed jurnals.

Abstract:

The most frequently used photoactive composite materials are based on titanium dioxide. These composites are capable to convert solar energy into chemical energy to oxidize or completely mineralize the adjacent molecules. This work is focused on the photocatalytic degradation of microorganisms by the prepared TiO2/SiO2 nanocomposite and on its antibacterial characterization. The intention of this work is the nanocomposite application on the building objects and other available surfaces in order to improve their quality and to reduce deteriorating processes caused by biology pollutants such as algae, lichens, bacterias etc. The photocatalytic material TiO2/SiO2 was prepared. For the antibacterial activity characterization the ISO standard method was used - test method for antimicrobial activity of photocatalytic Semiconducting materials. The antibacterial effect was tested on the bacteria Escherichia coli. We proved the strong antibacterial efficiency of the prepared TiO2/SiO2 composite and its ability to improve building surfaces conditions.