2nd World Congress and Expo on

Nanotechnology and Materials Science

April 04-06, 2016, Dubai, UAE

Scientific Programme(Day 1 : Apr-04-2016)

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Keynote Speakers

Der-jang Liaw
National Taiwan University of Science and Technology, Taiwan
Title: Novel Functional Polymeric Nanomaterials : Synthesis, Optoelectronic, Selective Dispersion of SWNTs and Photovoltaics Applications

Biography: Professor Der-Jang LIAW, Polymer Science Doctor (Ph.D. Polymer), is currently a Chair professor of Chemical Engineering at National Taiwan University of Science and Technology (NTUST). He holds his Master and Ph.D degrees in polymer science at Osaka University (Japan) and published about 360 SCI papers (h-index = 44 from ISI Web of Knowledge), 180 conference papers and 60 patents. In 2009, he was a recipient of the International Award from the Society of Polymer Science, Japan along with Prof. J. M. J. Frechet (USA) and Prof. K. Muellen (Germany). He received the Outstanding Polymer Academic Research Prize in 2012 and Lifetime Achievement Prize from The Polymer Society of Taiwan in 2013. He has been a fellow of The Polymer Society of Taiwan since 2014 and has been Academician of the Russian Academy of Engineering since 2011. Prof. LIAW is on the Editorial Advisory Board of Polymer (UK), Polymer Journal (Japan), Polymer International (UK), Journal of Polymer Research (1994~2001), High Performance Polymers (UK) (NASA Editor-in-Chief), Materials (Switzerland) and Soft Nanoscience Letters (USA). He has also served on the International Advisory Board for Polycondensation 2014 (Tokyo) and Polycondensation 2016 (Moscow), IUPAC Macro2008 (Polymer Synthesis, Session Chairman), International Advisory Board of European Polymer Congress 2009 (Graz, Austria), International Advisory Committee of Pacific Polymer Federation (PPF), International Advisory Board of International Symposium on Olefin Metathesis (ISOM 19 [France], ISOM20 [Japan] and ISOM21 [Austria]). He was an honorable guest at Nanotechnology-2015 (Dubai, UAE), Federation of Asian Polymer Societies Polymer Congress, 4FAPS-IPC 2015 (Kuala Lumpur, Malaysia), member of Asia Polymer Association, APA-2015 (India) and on the Organizing Committee of Nanotechnology and Material Science, Nanotechnology-2016 (Dubai, UAE). Currently, Prof. LIAW’s research includes: 1) synthesis of conjugated polymers used for carrier transporting materials of solar cells, 2) nanographenes-containing polymers, 3) selective dispersion of carbon nanotubes by conjugated polymer wrapping and 4) synthesis and characterization of high performance polyimides (PIs) and polyamides (PAs) with organo-soluble, thermal stable and favorable optoelectronic properties. He studies the synthesis of all possible functional polymers via precision polymerization techniques including free radical polymerization, ring-opening metathesis polymerization (ROMP), UV curing and moisture curing polymerizations for adhesives and coatings, and polycondensation or polymer reaction for optoelectronic devices, biomaterials, next-generation semiconductor materials and solar energy applications.

Abstract: Novel nanomaterials such as polyimides (PIs), polyamides (PAs), conjugated polymers and polynorbornenes (PNBs) were successfully prepared from various polymerization techniques including low temperature polycondensation, Suzuki coupling and ring-opening metathesis polymerization (ROMP). PIs derived from different architecture designs revealed unique physical-mechanical, electrical and chemical properties. In addition, the PIs films also exhibited high thermal stability (Tg > 300oC), transparency above 90% in visible light region (400-700 nm) and flexibility which are important for optoelectronic applications. PAs with the pyridine moiety displayed good film forming abilities, flexibility, high thermal resistance and yellow emission at 552 nm due to excimer generated by protonation. Conjugated polymers were used for single-walled carbon nanotube (SWCNT) wrapping to separate metallic and semiconducting nanotubes. Their chiralities such as (6,5), (9,5) or (8,7) were identified by photoluminescence-excitation (PLE) maps as well as UV/vis/NIR absorption spectra. Polytriarylamines- or poly(triarylamine-fluorene)-based conjugated polymers with water/alcohol solubility were applied for the hole-transporting materials of solar cells including perovskite solar cells and organic photovoltaics (OPVs). When alcohol soluble polytriarylamine-based conjugated polymers were used in perovskite solar cells, the overall power conversion efficiency (PCE%) (6.3%) was higher than that of PSS:PEDOT -based solar cells (3.9%). The conjugated polymers and PNBs containing hexa-peri-hexabenzocoronene (nanographene) were well dispersed in cyclohexylpyrrolidone (CHP) by bath sonication and possessed exfoliation emission in PLE maps. PNBs synthesized via ROMP showed excellent transparency (90 %) and high thermal stability (Tgs > 160 oC). Triarylamine-containing polymers had electrochromic properties and capacity for multiple colour change reversibilities. These polymeric materials had high organo-solubility in common solvents and as a result can be used for solar cells, organic field effect transistors, polymer memories, and smart windows applications.


Masaru Matsuo
Dalian University of Technology, China
Title: Dielectric response behavior of Zn and Mg doped Fe3O4 nanoparticles and application to anode for lithium ion batteries

Biography: Masaru Matsuo has completed his PhD at Kyoto University in Japan and he was a professor of Nara Women’s University. After his retirement, he became a full time professor of Dalian University of Technology in China. Since September 1st 2014, he is a visiting professor of Dalian University of Technology. He has published more than 200 papers in refereed journal articles. He is IUPAC fellow and he received Paul Flory Polymer Research Prize on April 2010.

Abstract: Zinc (Zn) and magnesium (Mg) doped Fe3O4 nanoparticles representing as ZnxFe3-xO4 and MgxFe3-xO4 ( ) were analyzed in terms of dielectric response behavior and the application to anode for lithium ion batteries. The crystal unit volume (Vc) by Zn-doping was expanded up to x = 0.4 as the acceptable limit, which was attributed to the large difference between doping Zn2+ ion radius and replaced Fe3+ ion radius. On the other hand, Vc by Mg-doping at was constant but the crystal size decreased with increasing x. Doping beyond x = 0.6 provided small amorphous power aggregates. Such difference affected on the dielectric response behavior of permittivity ( ) and electrical loss ( ). To analyze the behavior, the real (Z’) and imaginary (Z”) of impedance were measured for five nanoparticles, Fe3O4, Zn0.2Fe2.8O4, Mg0.1Fe2.9O4, Mg0.6Fe2.4O4 and MgFe2O4 and the fitting between experimental and theoretical curve was carried out by using three connected arrangement of normal parallel circuit with resistance and capacitance and two parallel circuits with resistance and constant phase elements (CPE) reflecting the phase lags of resistance between domain, domain boundary in addition to the phase lags of resistance between gains and two electrodes. In this case, the good fitting could be realized for doped particles with crystal domains, while the good fitting for doped particles with amorphous powder by crystal domain destruction was achieved by universal dielectric response (UDR) associated with power-law frequency dependence of AC conductivity reflecting high disordered system by heavy doping. The composites adhering the doped nanoparticles on the sidewalls of multiwall carbon fibers (MWNTs) were used to study the stability of capacity as anode of lithium ion batteries. Among the composites, Zn0.2Fe2.8O4 with the maximum saturation magnetization provided the highest capacity with good stability under discharge and charge cycles. The charge and discharge of lithium ions for ferrite crystal units of Zn0.2Fe2.8O4 are thought to be similar to those for MWNTs and then the expansion of the Zn0.2Fe2.8O4 crystal unit by zinc doping causes the significant effect on the charge and discharge of lithium ions.


Jorge M. García
Instituto de Microelectronica de Madrid -CNM, CSIC, Spain
Title: MBE-grown nanostructures, thermoelectric nanomaterials and nanomechanical systems

Biography: Dr. Garcia has received his PhD in Physics in 1995 from Universidad Autónoma de Madrid. He did his Post-Doc at the University of California, Santa Barbara, USA. In 1998 he joined Instituto de Microelectronica de Madrid (IMM), CSIC. He also worked from 2007-2008 at Bell Labs (USA) and from 2009-2012 at Columbia University (USA). His work focuses on fabrication by Molecular Beam Epitaxy of self assembled nanostructures and graphene and their electronic and optical properties. He is co-author of >160 publications and 3 patents with >5840 citations. H factor 40. Presently is Director of the IMM.

Abstract: The revolution of nanotechnology is already around us. As an example, the information technologies (IT), which are already reshaping our world, are possible due to an accumulative knowledge in which nanotechnology is crucial. One of these technologies is Molecular Beam Epitaxy (MBE) which was developed on the late 60´ and that still stands as a fundamental nanotool. At the Instituto de Microelectronica de Madrid we take advantage of the exciting possibilities of nanotechnoly and nanoscience applied to the fields of IT, energy harvesting and health. I will show, for example, how a deep understanding of MBE growth processes enables the fabrication of self-assembled III-V nanostructures such as quantum rings, quantum dots, and quantum wires that can be on-will tuned to cover a wide range of the spectrum from 0.98 mm to 1.6 μm. Another example is the possibility of nano-engineer thermoelectric materials that enables the fabrication of high performance devices and systems where quantum size effects provide additional ways to enhance energy conversion efficiencies in nanostructured materials. Another exciting field in which nanotechnology is allowing new possibilities is biological functionalization of nanomechanical systems and design of novel approaches for cancer sensing with unprecedented sensibility.


Mohammad A. Qasaimeh
New York University Abu Dhabi, Abu Dhabi, UAE
Title: Microfluidic systems for single cell studies

Biography: Dr. Qasaimeh is an Assistant Professor of Engineering at New York University Abu Dhabi (NYUAD). He established the Advanced Microfluidics and Microdevices Laboratory (AMMLab), where his group are focused in developing microfluidic and MEMS devices for biomedical applications. Prior to joining NYUAD, he was a Postdoctoral Research Associate at Massachusetts Institute of Technology and Harvard Medical School, and earned his PhD degree in Biomedical Engineering from McGill University. Dr. Qasaimeh received several prestigious fellowships and awards during his career including the NSERC Postdoctoral Fellowship, and his research has been published in several peer-reviewed journals including Nature Communications and PLOS Biology.

Abstract: Microfluidics has emerged as a technology with significant impact on medical research and clinical applications. The ability to manipulate fluids at the microscale has led to innovative and powerful techniques to manipulate and study cells at the single cell level. This talk will cover three different microfluidic systems that we developed to study different biological systems at the single cell level. The first system intended to study cancer cell survival and death following stimulation with Tumor Necrosis Factor (TNF). Using the system, cells were selectively exposed to brief pulses of TNF, as short as 8 s. We studied the survival and death pathways in cells, and preliminary results suggested that short pulses of TNF stimulation can provoke early cancer cell death. The second system is the Microfluidic Quadrupole (MQ), which constitutes the first experimental demonstration and characterization of fluidic quadrupoles. We used the MQ to manipulate concentration gradients of Interleukin-8 atop human neutrophils cultured in Petri-dishes. We challenged neutrophils with stationary and moving gradients and studied their dynamics during adhesion, polarization, and migration. Finally, I will discuss our recent experiments in using the microfluidic technology to capture circulating tumor cells from blood samples taken from cancer patients.


Adnen Mlayah
CNRS-Université de Toulouse, France
Title: Exciton-Plasmon interaction in Hybrid Transition Metal Dichalcogenide/Gold Nanostructures

Biography: Adnen Mlayah is a Professor of Physics at Paul Sabatier University of Toulouse and a researcher at the Centre d'Elaboration de Matériaux et d'Etudes Structurales-CNRS, working in the field of Nanoscience and Nanotechnology. Main research interests are centred around the optical properties of nanomaterials and nanostructures. He authored 110 research papers reporting experimental and theoretical investigations of the light-matter interaction at the nanoscale.

Abstract: Monoatomic layers of Transition Metal Dichalcogenide materials have recently triggered a strong interest due to their unique optical, electronic and spintronic properties. These properties arise from the combination of ultimate exciton confinement in two dimensions, strong spin-orbit interaction at the valence band edges and non-centrosymmetric crystal structure. Transition Metal Dichalcogenide (TMD) MX2 (where M is Mo or W and X is S, Se or Te) are very promising for applications as they might be exploited in a new class of opto-electronic devices based not only on the charge and spin degrees of freedom but also on the valley polarization induced by circularly polarized light pumping. On the other hand, surface plasmons sustained by metal nanoparticles have been extensively investigated in recent years because of their ability to capture, confine and guide light at the nanoscale and in a broad spectral range. Hence, it is very interesting to fully integrate TMD monolayers and metallic resonators within hybrid excitonic/plasmonic nanostructures with the aim of generating new optical excitations based on the near-field interaction between localized surface plasmons and confined excitons.Various applications are targeted : plasmonic enhanced sensitivity of field-effect transistors and photodetectors, enhanced photocatalytic water splitting, enhanced photoluminescence emission via direct plasmon-to-exciton conversion. In this presentation, I will discuss the physics of the plasmonic-excitonic near-field interaction in various hybrid TMD/Metal nanostructures and present recent experimental results obtained by optical spectroscopy techniques and simulations.


Arun Bansil
Northeastern University, USA
Title: Topological Phases of Quantum Matter as Novel Platforms for Fundamental Science and Applications

Biography: Bansil is a University Distinguished Professor in physics at Northeastern University. He served at the US Department of Energy managing the Theoretical Condensed Matter Physics program (2008-10), is an academic editor of the international Journal of Physics and Chemistry of Solids (1994-), the founding director of Northeastern University’s Advanced Scientific Computation Center, and serves on various international editorial boards and commissions. He has authored/co-authored over 300 technical articles and 18 volumes of conference proceedings covering a wide range of topics in theoretical condensed matter and materials physics, and a major book on X-Ray Compton Scattering (Oxford University Press, Oxford, 2004).

Abstract: I will discuss how topological phases arise in quantum matter through spin-orbit coupling effects in the presence ofprotections provided by time-reversal, crystalline and particle-hole symmetries, and highlight our recent work aimed at predicting new classes of topological insulators (TIs), topological crystalline insulators, Weyl semi-metals, and quantum spin Hall insulators. [1-10] Surfaces of three-dimensional (3D) topological materials and edges of two-dimensional (2D) topological materials support novel electronic states. For example, the surface of a 3D TI supports gapless or metallic states, which are robust against disorder and non-magnetic impurities, and in which the directions of momentum and spin are locked with each other. Similarly, in 2D TIs, also called quantum spin Hall insulators, the 1D topological edge states are not allowed to scatter since the only available backscattering channel is forbidden by constraints of time-reversal symmetry. The special symmetry protected electronic states in topological materials hold the exciting promise of providing revolutionary new platforms for exploring fundamental science questions, including novel spin textures and exotic superconductors, and for the realization of multifunctional topological devices for thermoelectric, spintronics, information processing and other applications. Work supported by the U. S. Department of Energy


Nanomaterials
Nanoelectronics
Session Chair:
Adnane Abdelghani
INSAT, Tunisia


Session Introduction

H. Chammem, I. Hafaid, A. Abdelghani
Carthage University, Tunisia
Title: Impedance Spectroscopy and Surface Plasmon Resonance for C-Reactive Protein Detection

Biography: Prof.Dr.A.Abdelghani is a Full Professor at the National Institute of Applied Science and Technology (INSAT, Tunisia) working mainly in the field of Microsensors and Microsystems. He obtained the master degrees in "Microelectronic Devices" at the INSA of Lyon (France) in 1994, then a Ph.D thesis from Ecole Centrale of Lyon (France) in 1997. He obtained a post-doc position in Germany between 1997-2000. He obtained the Habilitation in Physics in Tunisia (faculty of Science of Tunis) in 2004 and a Habilitation (worlwide recognition for conducting and leading research) in "Sciences pour l’Ingénieur" in 2009 at the Ecole Normale Supérieur de Cachan (France). He organized three International Conferences in Tunisia in the Field of Nanotechnology (2009, 2012 and 2014) with the Alexander Von Humboldt Foundation (Germany). He is now the leader and principal investigator of a research group working mainly on gas sensors based on functionalized carbon nanotubes (metallic oxides, nanowires, nanoneedles, polymers) and on the development of interdigitated gold microelectrodes integrated in microfluidic cell for bacteria analysis in biologic medium. He published more than 85 papers in International Journals and supervised more than 10 Ph.D thesis and 30 masters student. Prof. Abdelghani is part of worldwide renowned scientists as editorial member of several peer-reviewed scientific journals. He was a coordinator of Science For Peace NATO Project (2009-2011), National science Fondation Project (2009-2013), of Tempus-Project (2013-2016) and coordinator of a recent NATO-SFP project (2013-2016). He is deeply involved in industrial applications in his field of research with implications for the design and the development of affordable and cost-effective sensing devices for diagnostics and theranostics which will have an effective impact in the developing countries.

Abstract: C-reactive protein (CRP) is a protein present in plasma and is one of the most expressed proteins in acute phase inflammation cases, being a known biomarker of inflammatory states. Detection and quantification of CRP in an easy, cheap, and fast way can improve clinical diagnostics in order to prevent serious inflammatory states. In this work, we study the electrochemical and optical properties of protein G layer grafted on gold microelectrodes with impedance spectroscopy and surface plasmon resonance imaging techniques for C-reactive protein detection. Two CRP-antibody immobilization methods were used: the first method is based on direct physisorption of CRP-Antibody onto gold microelectrodes; the second one is based on oriented CRP-antibody with protein G intermediate layer. The two developed immunosensors were tested in presence of CRP antigen in phosphate buffer saline solution with impedance spectroscopy and surface plasmon resonance imaging The reproducibility was tested against five substrates prepared in the same conditions at room temperature. The negative control was obtained after different injection of antigen-rabbit onto gold microelectrode coated only with anti-CRP antibody.


Nekane Guarrotxena
Spanish National Research Council (CSIC), Spain
Title: Efficient Ag-nano assemblies separation for practical applications

Biography: Nekane Guarrotxena Ph.D. from the University of Complutense, Madrid-Spain in 1994 and has been post-doctoral research at the EcoleNationaleSuperieured´Arts et Metiers, Paris-France (1994-1995) and the University of ScienceII, Montpellier-France (1995-1997). From 2008-2011, she was visiting professor in the Department of Chemistry, Biochemistry and Materials at University of California, Santa Barbara-USA and the CaSTL at University of California, Irvine-USA. She is currently Research Scientist at the Institute of Polymers Science and Technology, CSIC-Spain. Her research interest focuses on the synthesis and assembly of hybrid nanomaterials, nanoplasmonics, and their uses in nanobiotechnology applications (bioimaging, drug delivery, therapy and biosensing).

Abstract: Rational assembly of nanoparticles (NPs) is relevant for effective exploitation of structure-dependent material properties and for making nanostructured materials with specific activity in optical (sensing) and electronic (nanodevices) applications. Despite relevant improvements on solid surfaces, fabrication and organization of narrow size- and shape distributions of NPs in solution remain a challenge. One of the most successful approaches for their fabrication involves use of colloids and well-established thiolate adsorption chemistry. The general difficulty in this controlling aggregation methodology is that, the linking process is random by nature and is difficult to control, generating a statistical distribution of aggregated NPs. An alternative to non-ideal NPs assembly would be an effective postsynthetic purification method. In this presentation, we will focus on this approach for collecting efficient and intense optical SERS active nanostructure for novel applications fromNP-assemblies pool.


Nicholas Adkins, Dmytro Shevchenko and William Griffith
University of Birmingham, United Kingdom
Title: The Production of Light Alloy Metal Matrix Composites Containing Nanoparticles

Biography: Dr. Nicholas Adkins is a Senior Research Fellow in the Advanced Materials & Processing Laboratory at the University of Birmingham, UK. Having received his PhD in Metallurgy in 1986 from the University of Surrey he has over 30 years experience in Powder Metallurgy and the application of Hot Isostatic Pressing. Nick now works at the University on several large, EU-funded, projects including “AMAZE”, the largest EU project on Additive Manufacturing, “AccMet” a large programme on combinatorial metallurgy and “Exomet” on metal matrix nano-composites. He is co-author of over 60 publications and 6 patents

Abstract: Development of high performance light alloys is key for the aerospace and automotive industries. This paper introduces a way to increase the properties of current alloys by introduction of nanomaterials into the metal matrix. Industrial scale application of metal matrix composites (MMC) is usually limited by the complexity of MMC production and the scalability of the manufacturing process. A novel method of production of master alloys has recently been developed at the University of Birmingham. This method includes fabrication of porous media from nanomaterial (preform) andfurther infiltrationof preform with the liquid metal. Magnesium master alloys with the loading from 15vol% to 30vol% of SiC nanomaterial have been produced. The method of production of the preform using starch consolidation is described. Hot Isostatic Pressing (HIP) of a specially designed mild steel container has been used to infiltrate the preform. The high pressure available during HIP process (up to 150MPa) ensures infiltration of the magnesium alloy to full density. The preform is at the same temperature as the metal during infiltration. The master alloy could be diluted during convention melting process to produce a nanocomposite with 2% loading. Some preliminary mechanical properties for the composite are presented. This work was undertaken as a part of the European Community funded FP7 research project ExoMet “Physical Processing of Molten Light Alloys under the Influence of External Fields”.


V. Sverdlov, J. Ghosh, A. Makarov, T. Windbacher, and Siegfried Selberherr
Institute for Microelectronics, Austria
Title: Nanoelectronics with Spin

Biography: Professor Siegfried Selberherr was born in Klosterneuburg, Austria, in 1955. He received the degree of Diplomingenieur in electrical engineering and the doctoral degree in technical sciences from the Technische Universität Wien in 1978 and 1981, respectively. Dr. Selberherr has been holding the venia docendi on computer-aided design since 1984. Since 1988 he has been the Chair Professor of the Institut für Mikroelektronik. From 1998 to 2005 he served as Dean of the Fakultät für Elektrotechnik und Informationstechnik. Prof. Selberherr published more than 350 papers in journals and books, where more than 100 appeared in Transactions of the IEEE. He and his research teams achieved more than 1000 articles in conference proceedings of which more than 150 have been with an invited talk. Prof. Selberherr authored two books and co-edited more than 30 volumes, and he supervised, so far, more than 100 dissertations. His current research interests are modeling and simulation of problems for microelectronics engineering. Prof. Selberherr is a Fellow of the IEEE, a Fellow of the Academia Europaea, a Fellow of the European Academy of Science and Arts, and a Distinguished Lecturer of the IEEE Electron Devices Society.

Abstract: The breath-taking increase in performance of nanoelectronic circuits has been continuously supported by the uninterrupted miniaturization of devices and interconnects. Among the most crucial technological changes lately adopted by the semiconductor industry is the introduction of a new type of multi-gate three-dimensional (3D) transistors [1]. This technology combined with strain techniques and high-k dielectrics/metal gates offers great performance and power saving advantages over the planar structures and allows continuing scaling down to 14nm feature size and beyond. In order to continue with scaling further, a new material with improved transport characteristics for the channel must be introduced [2]. Although single devices with gate length as short as a few nanometers have been demonstrated [3], fabrication, control, and integration costs combined with reliability issues will gradually bring conventional transistor scaling to an end. The principle of transistor operation is fundamentally based on the charge of an electron interacting with the gate voltage induced electrostatic field. Another intrinsic electron characteristic, the electron spin, attracts at present much attention as a possible candidate for complementing or even replacing the charge degree of freedom in future electronic devices. The electron spin state is characterized by two projections on an axis and could be potentially used in digital information processing. In addition, it takes an amazingly small amount of energy to invert the spin orientation. The key advantages of all spin-based computing as compared to a conventional processor with equivalent functions are zero static power, small device count, and low supply voltage, as listed in a recent review [4]. Silicon, the most important material of electronics, predominantly consists of nonmagnetic 28Si nuclei and is characterized by weak spin-orbit interaction. Because of these properties the electron spin lifetime in silicon is relatively long. This makes silicon a perfect candidate for spin-driven device applications. However, even a demonstration of basic elements necessary for spin-related applications, such as spin injection, detection, and propagation was missing until recently. The fundamental reason has been identified as an impedance mismatch problem [5]. Even though there is a large spin imbalance between the majority and minority spins in a metal ferromagnet, both channels with spin-up and spin-down are equally populated in a semiconductor due to the small density of states as compared to that for the minority spins in a ferromagnet. In other words, because of the large resistance of the semiconductor, the voltage applied to the contact between the ferromagnet and the semiconductor drops completely within the semiconductor, and the properties of the contact are dominated by the non-magnetic semiconductor, thus resulting in a current without spin polarization. A solution to overcome this problem is to use the hot electron injection [6]; however, the efficiency of spin injection and detection is low. Another solution to the impedance mismatch problem is the introduction of a potential barrier between a metal ferromagnet and a semiconductor [7]. In this case the influx of carriers from the ferromagnet into the semiconductor is reduced proportionally to the ration of the densities of states in a semiconductor and a ferromagnet. This guarantees the spin injection into the semiconductor. A successful experimental proof of spin injection at low temperature from an iron electrode through aluminium oxide [8] was demonstrated in 2007. At room temperature spin injection into n- and p-doped silicon was shown in 2009 [9]. The authors used heavily doped silicon samples to avoid an extended depletion layer causing large tunnel barriers. The problem of making good contacts with low resistance per area is critical for spin injection. Tunnel contacts made of a single layer graphene [10] have been shown to be close to optimal [11]. Electrical spin injection through silicon dioxide at temperatures as high as 500K has also been demonstrated [12]. Regardless of an ultimate success in demonstrating spin injection into silicon at room temperature, there are unsolved issues, which may compromise the present understanding of the spin injection process in general. One problem is a several orders of magnitude discrepancy between the signal measured in a scheme where the same ferromagnetic contact is used to inject and to measure the spin accumulation and its theoretical value [11]. Similar observations were also made for germanium [13] as well as for other semiconductors [14]. These discrepancies are heavily debated [15], [16], [17] and more research is needed to resolve the controversies. The excess spin is not a conserved quantity: While diffusing, it gradually relaxes to its equilibrium value which is zero in a nonmagnetic semiconductor. Spin can propagate 350 microns through a silicon wafer at 77K [6]. The spin diffusion length in silicon at room temperature is around 200nm [11]. In a confined electron structure the spin lifetime is further reduced due to the additional spin relaxation at the interfaces [18]. This shortens the spin diffusion length further, which represents a threat for using CMOS transistors for spin-driven applications. Technologies to boost the spin lifetime are needed. The spin lifetime is determined by the spin-flip processes. Several important spin relaxation mechanisms are identified [19, 20]. The Elliot-Yafet mechanism is mediated by electron-phonon interaction and the intrinsic interaction between the orbital motion of an electron and its spin is responsible for the spin relaxation in silicon [21]. The main contribution to the spin relaxation is due to optical phonon scattering between the valleys residing at different crystallographic axis, or f-phonon scattering [22]. Stress lifts the degeneracy between the non-equivalent valleys and can suppress the spin relaxation by a factor of three. The theory of spin relaxation in inversion layers and thin films must account for the most relevant scattering mechanisms, namely electron-phonon interaction and surface roughness scattering. It turns out that in (001) silicon films, where the non-equivalent valley degeneracy is lifted by confinement, the spin lifetime is controlled by the intervalley scattering processes between the equivalent valleys [23]. This is in contrast to the effect on the momentum relaxation time which is determined by the elastic intravalley scattering. Uniaxial stress along [110] direction lifts the remaining degeneracy between the two equivalent valleys thus reducing the intervalley spin relaxation [24]. This results in a giant, close to two orders of magnitude, spin lifetime enhancement [23] at saturation for shear strain values of about 1.5%. At the intermediate strain values the spin lifetime increase is almost exponential. Strain techniques are now routinely used to boost the electron mobility. It is therefore straightforward to apply the same techniques to obtain a spin lifetime close to 1ns required for spin-driven applications in CMOS transistor technology. For building a SpinFET [25] purely electrical spin manipulation in the channel is required. However, the channel length required to rotate the spin substantially in silicon is several microns and thus too large [26]. The only viable option left to use nanoscale CMOS is likely to convert a MOSFET to a SpinFET by adding the spin degree through introducing ferromagnetic source and drain contacts [27]. The current in this structure depends on the relative orientation of the magnetizations of source and drain paving the path towards programmable nonvolatile logic. The contact magnetization direction can be switched electrically by using spin torque transfer. However, due to the low spin injection efficiency at room temperature, a SpinFET has not yet been realized. Although significant progress in understanding spin injection, transport, and detection in silicon has been achieved, more research is urgently needed to increase the spin injection efficiency at room temperature and to resolve the issue of spin manipulation by pure electrical means. The most viable option for practical spin-driven applications in the near future is to use magnetic tunnel junctions (MTJs). MTJ-based spin transfer torque MRAM is CMOS compatible, non-volatile, and scalable. It is fast and, in addition, characterized by an infinite endurance and high density. 64Mb MRAM arrays are already in production. A combination of an MTJ with a MOSFET opens a new opportunity to built non-conventional non-volatile logic-in-memory systems [28].


Farah Benyettou
New York University Abu Dhabi, Abu Dhabi, United Arab Emirates
Title: Chemotherapeutic Silver Nanoparticles: Input of Drug Combinations

Biography: Dr Farah Benyettou explored the chemical processes for drug delivery and the synthesis and modification of commercial anti-cancer drugs from the Bisphosphonate family. Subsequently, shee developed new and innovative anticancer superparamagnetic nanoparticles for drug delivery from the synthesis, to the characterizations and the biological evaluations. Dr Benyettou’s research approach is to use complementary properties such as porosity and magnetism, and develop new multifunctional and smart nanoplatforms for simultaneously imaging and therapy.

Abstract: Cytotoxic drugs are used during cancer chemotherapy to inhibit tumor growth and metastasis. However, many chemotherapeutic drugs, such as doxorubicine (Dox), have limited cellular uptake and a strong tendency to bind to off-target macromolecules. Together these characteristics lead to low therapeutic indices. Increasing the intracellular uptake of cancer drugs could prevent these complications. Another pitfall of chemotherapy is drug resistance. One strategy for avoiding drug resistance is drug combination. This approach can prevent side effects by allowing for reduced dosages and can improve efficacy if the chosen drugs act synergistically. For example, bisphosphonates act synergistically with many other anti-cancer agents. Alendronate (Ald), one of the most potent bisphosphonates, has been shown to increase cancer cell death in vitro when combined with Dox in breast cancer cells. We present here the synthesis of a silver nanoparticle-based drug delivery system that improves the anticancer therapeutic indices of doxorubicin (Dox) using alendronate (Ald) as an adjuvent. Water, under microwave irradiation, was used as the sole reducing agent for the size-controlled, bisphosphonate-mediated preparation of silver nanoparticles (AgNPs). The AgNPs were coated with and stabilized by the bisphosphonate alendronate (Ald). The bisphosphonate group of Aldtemplated the formation of the AgNPs, and was the site of the drug’s attachment to the nanoparticles. The free primary ammonium group of Ald was subsequently functionalized with either Rhodamine B (RhB) by amide linker formation or Dox through imine bond formation. The RhB-conjugated nanoparticles (RhB-Ald@AgNPs) were studied in HeLa cell cultures. Confocal fluorescence microscopy studies determined the main mechanisms of cellular uptake of the nanoparticles. The imine linker of the Dox-modified nanoparticles had significantly greater anti-cancer activity in vitro than either Ald or Dox alone. Thus, the ability of Ald to promote the assembly of Ald@AgNPs in a one step reaction, and the straightforward post-modification of Ald@AgNPs, offer an easy and environmentally friendly strategy for the formation of stable nanoparticles that couple the antiproliferative properties of the AgNPs, themselves, to those of the drug mixtures they carry. This system features a high degree of functionality and potency and is of potential therapeutic benefit


Mohamed A. Elblbesy
University of Tabuk, Saudi Arabia
Title: Hemocompatibility of albumin nanoparticles as drug delivery system, In vitro study

Biography: Mohamed Elblbesy Ph.D. Alexandria University, Alexandria - Egypt in 2005. He is assistant professor of Medical Biophysics in Medical Research Institute, Alexandria University, Egypt. He works now as associate professor in faculty of Applied Medical Science, University of Tabuk, Saudi Arabia. After studying physics as an undergraduate, He opted to follow a research career in the biophysical sciences. His PhD was initially in biophysical properties of blood and hemorheology. His work at Alexandria University initially revolved around analysis of the physical properties of red cells, and their effect on blood flow. He tried to understand red blood cells aggregation and electrical and magnetic properties of red blood cells in normal and abnormal states. As development of His work and knowledge He went toward nanotechnology. His research in nanotechnology focus on the study of the effect of the synthetic nanoparticles on the rheological properties of the blood specially the natural synthetic nanoparticles like albumin and chitosan nanoparticles

Abstract: Nanoparticles are colloidal particles, which are less than 1 µm in diameter. They have the unique property to accumulate at the site of inflammation and therefore, are very suitable for targeted drug delivery. As a major plasma protein, albumin has a distinct edge over other materials for nanoparticles preparation. It is cheap and easily available. The present work was aimed to prepare bovine albumin nanoparticles (BAN) with simple coacervation method and test their hemocompatibility. Albumin nanoparticles obtained by this method were in size range 250-350 nm at pH= 7.4 with. In vitro hemocompatibility tests of the prepared (BAN) had been done after incubation of BAN with normal blood for two hours at 37°C. Hemocompatibility tests showed that reduction of hemolysis percentage of erythrocytes due to exposure to BAN. The other blood parameters such as hemoglobin (HG), mean corpuscle hemoglobin (MCH), mean corpuscle hemoglobin concentration (MCHC) were in the normal. Prothrombin time (PT) and erythrocytes sedimentation rate (ESR) decreased as the concentration of BAN increase. Due to the results obtained in this study it was proven that BAN could be used safely and without abnormal effect when interacted with blood through many biomedical applications.


Hassan A. Hemeg
Taibah University, Kingdom of Saudi Arabia
Title: Nanomaterials for alternative antibacterial therapy

Biography: Dr. Hassan A. Hemeg pursued Masters in Pathological Science from Sheffield University, UK and received his Ph.D. fromKing Abdulaziz University, Saudi Arabia. He also completed Diploma in National Association of Safety Professionals from USA. He has earned several honors such as Fellow of the Institute of Biomedical Science, UK andCertified Canadian Accreditation Specialist for Health Care Facilities. He also acquired training in Microbiology from SheffieldUniversity and Bristol University, UK and,U.S Department of Labor Occupational Safety and Health Administration. He has also worked asEducational Instructor and Supervisor in Clinical Molecular Microbiology Laboratories at King Abdulaziz University Hospital, Jeddah and as Head of Environmental Health and Safety Unit at King Abdulaziz University Hospital.He has served as a member, Secretary and Chairman of several Committees and is a permanent representative of Ministry of Higher Education in Safety Traffic Committee. Presently, he is also the Vice Dean of Medical Applied Science College at Taibah University. Hisresearch interest is antimicrobial. He has published several papers in Journals of International repute.

Abstract: Despite numerous potent antibiotics, bacterial infections, particularly those caused by nocosomial pathogens are a major cause ofmorbidityand mortality around the globe.These affect the severely ill, hospitalized and immunocompromised patients who are vulnerable to infections. The option for treatment with antimicrobials is mostly empirical and not bereft of toxicity, teratogenicity and/ormutagenicity, hypersensitivity. The appearance of multi-drug resistant bacterial strains further aggravates the clinical problem as the microorganisms spread epidemically among the patients. Moreover, there is a growing concernregarding biofilm-associated infections that are refractoryto the currently available antimicrobial armory, leaving almost no treatment option. Thus, there is an urgent need to develop additional bactericidal agents.The attention has been especially devoted to new and emerging nanoparticle-based materials in the field of antimicrobial chemotherapy. The past decade has witnessed a substantial surge in the global use of nanomedicines as antimicrobials. Several metal and metal oxide nanoparticles have been reported for their antibacterial activity. The microbes are eradicated either by the microbicidal effects of the nanoparticlesitself, or by microbistatic effects followed by killing potentiated by the host's immune system. Theeffect of nanoparticles on the microbial biofilms along with the molecular mechanisms by which the nanoparticles annihilate multidrug-resistant bacteriawill be discussed. Combinatorial therapeutic approach with the metallic nanoparticles may serve as adjunct to the existing antibiotics and may help to curb the mounting menace of bacterial resistance and nocosomial threat.


N. Kamoun-Turki
Université de Tunis El Manar/ Tunis, Tunisia
Title: Growth of Cu2ZnSnS4 , ZnO by spray pylolysis and CdS by Chemical Bath Deposition for solar cell devices

Biography: Prof. Dr Najoua-Turki Kamoun is a full Professor at the Faculty of Sciences of Tunis (FST)/ University of Tunis El-Manar Tunisia. She obtained her Ph.D thesis in 1992 from FST and the Habilitation in Physics in Tunisia (FST) in 2000 and she is a Professor since 2007. Her academic research focuses on Transparent conductive oxides (TCO: ZnO, SnO2, In2O3,TiO2), binary semiconductors ( In2S3, SnS, CdS, Cu2S, ZnS, PbS), ternary (CuInS2, In(2-x)GaxS2, P3HT) and quaternary compounds(CuIn(1-x)GaxS2:CIGS and Cu2ZnSnS4:CZTS) for optoelectronic applications such as photocatalysis, gaz sensors, solar cells, UV and IR detectors. Nanomaterials and thin films are grown by different low cost techniques (spray pysolysis, chemical bath deposition, spin coating). She published more than 90 papers in International Journals and supervised more than 20 Ph.D thesis. Since 1989 she is a researcher in Physics Condensed Matter Laboratory (LPMC) where she is a head since 2011. In the period 2013-2014 she occupied the post of General Director of Physico-Chemical Analysis Institute in the Technopole of Sidi Thabet

Abstract: We have studied the effect of the flow rate on the physical properties of CuInS2 thin films. But as the indium is anexpensive element and rare in the earth’s crust, CuInS2 is replaced by Cu2ZnSnS4 (CZTS) which has received considerable attention as one of the promising absorbers for the fabrication of solar cells with conversion efficiency close to 12.6%[1]. In order to improve its structural, morphological, electrical and optical properties, we started by preparing CZTS thin film using an aqueous solution at various substrate temperatures by spray pyrolysis technique. Next Sprayed CZTS thin film prepared under the optimised conditions is annealed in nitrogen atmosphere at 450, 500 and 550 °C during 60 min. In another hand, we have prepared the CZTS thin films using an ethanolic solution atvarious sulfur concentration then the film deposited at the optimised condition was annealed under nitrogen atmosphere for an hour at different annealing temperatures. Finally, as ultimate test it is useful to finish some solar cells and test them accordingly. In our next researches, we can test our findings through the proposed following solar cell: Ag/CZTS/CdS/ZnO/ZnO:Al. The CZTS thin films will be elaborated under the optimized experimental spray parameters for both solution types. In our laboratory, cadmium sulfide nanomaterial is grown by Chemical bath deposition it is a buffer layer and Zinc oxide material is synthetised by spray pyrolysis it is an optical window in solar cell devices.


Alicja Porenczuk, Piotr Firlej, Grażyna Szczepańska, Adam Kolenda and Dorota Olczakn Kowalczyk
Warsaw Medical University, Poland
Title: The laboratory comparison of shear bond strength and microscopic assessment of failure modes for a glass-ionomer cement and dentin bonding systems combined with silver nanoparticles

Biography: Alicja Porenczuk (born 21-03-1986, Torun, Poland), is a graduate from the Warsaw Medical University in Poland (D.D.S degree in 2010 and PhD in 2015). She is also a trained specialist in restorative dentistry and endodontics. She lives and works in Warsaw. Her scientific studies focus on the laboratory assessment of metal nanoparticles’ features and their influence on dental materials, especially resin adhesives. She is the author of 6 articles on nanomaterials, ex. shear bond strength, antibacterial properties, and is planning to widen the range of research in the future. As a private person, she is happily married, loves dancing and yachting.

Abstract: Dental caries is the most frequent oral disease worldwide. Due to the restorative materials’ technical imperfections and procedural mistakes, more than half of the cavity restorations are replaced due to bacterial microleakage. Therefore, the need for disinfection agents, such as silver nanoparticles (AgNPs), arises. The aim was to assess the shear bond strength (SBS) to dentin and failure modes of different dental materials (total-etch bonding system OptiBond Solo Plus® (Kerr Italia S.r.l. Scafati, Salerno, Italy), self-etch bonding system Clearfil SE Bond® (Kuraray Noritake Dental Inc., Kurashiki, Okayama, Japan), glass-ionomer cement Ketac Molar EasyMix® (3M ESPE Dental Products, St. Paul, USA)) following AgNPs (Nanocare Gold®; Dental Nanotechnology Ltd., Katowice, Poland) application. Forty-two non-carious extracted human third molars were chosen for the study comprising the SBS test followed by thermocycling of the probes used for an artificial ageing of the fillings, SEM/FIB, SEM/EDX and endodontic microscope evaluations. The AgNPs (shape mainly spherical of mean size 48 nm; concentration 3.96 µg/µl) in the material are attached to a liquid (isopropyl alcohol) and solid carriers. The results showed no impact of AgNPs addition to dental materials in terms of SBS to dentin. A change of the failure mode of the self-etch bonding system combined with AgNPs was observed, which may have a serious clinical impact. Also, the AgNPs were seen to be gathered in larger agglomerations in the dentin-adhesive border zone.


Sondes Machat
ESPRIT-Engineering School, Tunisia
Title: Nanotechnology and New ideas of Start-Up in Developing Countries

Biography: Sondes Machat obtained her Engineer diploma from the « Ecole Supérieure Privée d'Ingénierie et de Technologie » Tunisia in June 2014. She has a good experience in telecommunications, computing, maintaining websites, and management of administrative details of running a high-level conference meeting and workshops. She is now working on developping new ideas of start-up, business plan and implementation of nanotechnology in developing countries.

Abstract: In this work we present an approach for the use of devices for analyte (pesticides, bacteria, heavy ions, C-Reactive Protein, etc..) detection for different applications (food analysis, water anaylsis, medical diagnostic, etc..). Most of the analyte detection systems used in vivo are time consuming and need different steps of preparation (labeling, etc..) and which are currently used for diagnosis in intensive care units and Hospitals. The development of new device need laboratory experiment for stability, rabidity and reproducibility studies. We will show the need of the market for such kind of devices and namely for developing countries.


Rasha Ahmed Hanafy Bayomi
Kyoto Institute of Technology, Japan
Title: Measurement of Grain Size and Its Evolution on the Free Surface of SEBS Triblock Copolymer Film using AFM and Image Processing

Biography:

Abstract: Revealing structure-property relationship has been one of the key issues for development of novel functional or high-performance polymeric materials. We recently keep attention at “grain” of block copolymer microdomains because the grain of which size is several micrometers is considered to affect properties more directly. In this presentation, we focus on a grain in which spherical microdomains of block copolymers are regularly ordered in body-centered cubic (BCC) lattice. Especially, we discuss growth of the grain on a free surface of a thin film where (110) planes of the BCC lattice are spontaneously oriented parallel to the film surface. The sample used is PS-block-PEB-block-PS (SEBS8) triblock copolymer (PS (polystyrene) spherical microdomains embedded in the matrix of PEB (polyethylenebutylene); Mn = 6.7 104, Mw/Mn = 1.04, PS = 0.084 (volume fraction of PS). The sample was spin-cast on a silicon wafer from a toluene solution with a polymer concentration of 5.0 wt% at room temperature. Then, the as-spin-cast film was further subjected to the thermal annealing at 140˚C under the nitrogen atmosphere. The surface morphology was analyzed by atomic force microscopy (AFM), using apparatus Nano Scope IIIa with a cantilever (NANO WORLD) of which length was 125 mm and the spring constant was 42 N/m. The AFM observation was conducted with tapping mode by using J-Scanner (5654V).


Pitamber Mahanandia
National Institute of Technology Rourkela, India
Title: CuO/CdSe Core-Shell Nanowire Heterostructure for Photodetector Appl

Biography:

Abstract: Heterostructure core-shell nanomaterials photoconductors tend to exhibit high photoconductive gains and long recovery times mainly due to surface effects.We report the growth of CuO/CdSe core-shell heterostructures nanowires(NWs) synthesized by combining thermal oxidation deposition and chemical vapour deposition technique. Characterization of materials by scanning electron microscope, x-ray diffraction and and transmission microscope reveals the formation of highly dense crystalline semi-aligned CuO/CdSe core-shell heterostructure nanowires. The CuO/CdSe core/shell hetero structure NWs were then used as the active medium to fabricate a photo detector device. The CuO/CdSe core-shell heterostructure NWs as a photoelectrode with responsivity 10 A/W which corresponds to an external quantum efficiency of approximately 49 % have been obtained. The achieved high responsivity in the CuO/CdSe core-shell heterostructure NWs can mainly be attributed to the abrupt nature of the interface between CuO and CdSe, which effectively inhibits carrier recombination and facilitates an efficient carrier separation. Under illumination, the electron of CuO and CdSe present in their respective valence band are excited and move to their respective conduction band giving rise to current. The photo-generated electrons in the conduction band of CdSe are injected to the conduction band of CuO, leading to the high electron concentration in the conduction band of CuO. Due to the high carrier mobility, the high-crystalline CuO core makes it an effective channel for conducting electrons, while the holes are transported through CdSe. The separation of the charge carriers minimizes their recombination rate that results in increasing the photocurrent. These results demonstrate that the prepared heterostructured NWs can indeed serve as high performance photodetectors in the UV-Vis range