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Interfacial Synthesis of Electrically Conducting …

Abstract:
The study of semiconductor nanocrystals (NCs) is a very active research field, due to the wide range of applications, related to light-emission and absorption, photodetection, solar cells, light emitting diode or tunable emitters for bio-labeling1. One area is the development of detection techniques with high spatial resolution enabled by the small size of nanomaterials. As a representative example, nanometer probes of temperature can be very useful to obtain an accurate local value of temperature, particularly in catalysis where the activity and selectivity are temperature dependent. The key is to obtain the value of the local temperature inside the solution or inside the solid at the surface of the reactants. Certain catalytic reactions require high temperatures to occur so another challenge is to build a high local temperature probe (> 373 K). In this context, semiconductor NCs are promising objects to provide this precision due to the temperature dependence of their optical properties. We present here the synthesis of different types of NCs (Cd3P22, InP@ZnS3 and CdSe@CdS4), their capacities as nanothermometers for high temperatures (>340 K) and the conditions which have to be fullfilled for accurate measurements. Different parameters such as the wavelength, the intensity, the area and the full width at half maximum of emission were studied as a function of temperature. The studied temperatures ranges from room temperature to 540 K and the comparison between the different NCs is discussed.

Title of Talk: Synthesis and characterization of gold nanoparticles supported on two different metal oxides prepared by impregnation with ionic exchange to form ferromagnetic nanostructures.

Title of Talk: Synthesis of Graphene Oxide under Differing Conditions and its Characterization

Synthesis of electrically conductive organic solids

Abstract:
Novel polyacrylonitrile (PAN) grafted sepiolite nanohybrids were synthesized via emulsion graft polymerization. The influence of synthesis parameters on the degree of grafting was studied by varying the concentrations of monomer, initiator and surfactant. The nitrile groups of PAN were chemically modified into amidoxime. Both the grafting and amidoxime percentages were determined gravimetrically and maximum grafting of 373% was achieved at 5% acrylonitrile, 1% surfactant and 0.1% initiator concentrations. The presence of vibration at 2242 cm-1 in Fourier transform infrared (FT-IR) spectrum and x-ray diffraction (XRD) reflection at 2θ = 16.9° (010) confirmed the grafting of PAN chains onto modified sepiolite. XRD patterns also indicated a decrease in crystallinity of sepiolite and appearance of new amorphous region in grafted nanocomposites. The morphological changes of sepiolite during silanization and grafting of PAN is also confirmed by field emission scanning electron microscope (FESEM). Transmission electron microscope (TEM) images clearly showed the shortening of fibers after silanization of sepiolite and the same were involved in heterogeneous nucleation in micelles. These developed amidoxime grafted sepiolite nanohybrids can be used as adsorbent for the metal recovery.

Abstract:
Zeolitic imidazolate frameworks (ZIFs), a subclass of metal-organic frameworks (MOFs), havebeen recently employed in various fields such as gas separation, catalysis, water purification anddrug delivery.1 Their high importance is due to their chemical and thermal stability in addition tothe flexibility of their design. ZIFs have been synthesized solvothermally or at room temperatureusing organic solvents (e.g. methanol, DMF) or pure water.2 The control of size and morphologyof crystals has been achieved using reverse microemulsion methods, microwave, ultrasoundassistedsyntheses and coordination modulation methods.1-3 Herein, we investigate a newsynthesis method where ZIF crystals are produced using the reaction-diffusion framework (RDF)in a gel medium at room temperature. The method is based on the diffusion of an outer solutionof the organic linker or mixed linkers into an agar gel containing the inner metal ions Zn(II)and/or Co(II) where a precipitation reaction takes place leading to the formation of the ZIFcrystals. A propagating supersaturation wave, initiated at the interface between the outer solutionand the gel matrix leads to a precipitation front endowed with a gradient of crystal sizes rangingbetween 100 nm and 55 μm along the same reaction tube. While the precipitation fronts of ZIF-8 and ZIF-67 travel the same distance for the same initial conditions, ZIF-8 crystals therein areconsistently smaller than the ZIF-67 crystals due to the disparity of their rate of nucleation andgrowth. The effects of temperature, the concentration of the reagents, and the thickness of thegel matrix on the growth of the ZIF crystals are investigated. We also show that by using RDF,we can envisage the formation mechanism of the ZIF crystals, which consists of the aggregationof ZIF nanospheres to form the ZIF-8 dodecahedrons. Moreover, using RDF the formation of asolid-solution ZIF via the incorporation of Co(II) and Zn(II) cations within the same frameworkis achieved in a controlled manner. Finally, we demonstrate that doping ZIF-8 by Co(II)enhances the photodegradation of methylene blue dye under visible light irradiation in theabsence of hydrogen peroxide.

Physical Properties of Synthetic High Polymers; ..

Biography:
Mrs Shaista Taimur is a PhD scholar from Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences, Islamabad, Pakistan. Her PhD degree is in Materials Engineering (2017). She is scientifically skilled in polymeric nanohybrid composites synthesis and processing. Her reserach area and expertise are clay polymer nanocomposites (CPNs) synthesis and processing with special focus on chemical and radiation grafting, Organic-inorganic nanohybrids and their applications in toxic and precious metals removal and recovery and modification of nanoclay (sepiolite) for tailor made properties and applications. She has three international publications. She has teaching experience in different institutions of Pakistan.

Biography:
Assunta Marrocchi is currently Associate Professor at the Department of Chemistry, Biology and Biotechnology of the University of Perugia. She earned a PhD in Chemical Sciences at the same Institution. In 2008 she conducted research at Northwestern University, Evanston, IL (USA), as visiting scientist. Her research expertise and interests encompass the fields of 1) organic functional materials, with a special emphasis on the sustainable synthesis of photoactive organics for solar cells; 2) biomass sustainable conversion to high added value chemicals.

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"Synthesis and Characterization of Conducting ..


Electrically conductive polymers and process of ..

Abstract:
In this presentation, a particular focus will be given on our recent studies facing often-neglected critical aspects related to the costs and environmental impact - that is the sustainability- of organic electronics [1]. Thus, there will be discussed the development of clean chemical processes that can afford semiconducting materials with minimal production of waste and on a large scale. Also, studies on the development of (opto)electronically active layers integrating conjugated species and biodegradable/biocompatible insulating bulk polymers, in view to produce more sustainable and performing devices at remarkably low semiconductor content, will be shown.

Electrochemical synthesis of electrically conducting polymers from ..

Biography:
Assistant Professor Anthony Papathanassiou is leading the Dielectric Spectroscopy Laboratory at the Department of Physics, National and Kapodistrian University of Athens (NKUA), Greece. He got his PhD in Solid State Physics from NKUA. He worked as research associate in NKUA, Universität Bayreuth and Lyman Physics Laboratory, Harvard University as a research scholar and research fellow. His current research interest is on electric charge transport and relaxation in electron-conducting polymers and nano-composites, emphasizing on the role of pressure and temperature on electronic properties and phase transitions of condensed matter.

Synthesis of electrically conducting organic polymers: ..

Abstract:
Novel polyacrylonitrile (PAN) grafted sepiolite nanohybrids were synthesized via emulsion graft polymerization. The influence of synthesis parameters on the degree of grafting was studied by varying the concentrations of monomer, initiator and surfactant. The nitrile groups of PAN were chemically modified into amidoxime. Both the grafting and amidoxime percentages were determined gravimetrically and maximum grafting of 373% was achieved at 5% acrylonitrile, 1% surfactant and 0.1% initiator concentrations. The presence of vibration at 2242 cm-1 in Fourier transform infrared (FT-IR) spectrum and x-ray diffraction (XRD) reflection at 2θ = 16.9° (010) confirmed the grafting of PAN chains onto modified sepiolite. XRD patterns also indicated a decrease in crystallinity of sepiolite and appearance of new amorphous region in grafted nanocomposites. The morphological changes of sepiolite during silanization and grafting of PAN is also confirmed by field emission scanning electron microscope (FESEM). Transmission electron microscope (TEM) images clearly showed the shortening of fibers after silanization of sepiolite and the same were involved in heterogeneous nucleation in micelles. These developed amidoxime grafted sepiolite nanohybrids can be used as adsorbent for the metal recovery.

Color Control in π-Conjugated Organic Polymers for Use …

Biography:
Dr. Naoufel Khemiri is an Assistant Professor at El Manar Preparatory Engineering Institute in Tunisia. He obtained his Ph.D thesis in “Condensed Matter Physics” from the Faculty of Sciences of Tunis (FST), University of Tunis El Manar, Tunisia in 2012. He is now member of Photovoltaic and Semiconductor Materials Laboratory (ENIT, Tunis, Tunisia). He works mainly on the synthesis and the characterization of ternary and quaternary compounds (CuInS2, Zn(S,O), SnSb4S7, Cu2ZnSnS4 and Cu2ZnxFe1-xSnS4) for opto-electronic and solar cell applications. He published more than 20 papers in International Journals with impact factor and participated in several international conferences in materials science.

CHEMISTRY - University of Washington

Abstract:
In this work, we present experimental studies of two earth abundant thin film solar cell materials: Cu2ZnxFe1-xSnS4 and Zn(S,O). Cu2ZnxFe1-xSnS4 and Zn(S,O) are among the most promising candidates to substitute CIGS and CdS as aborber and buffer layers, respectively, in thin film solar cells. Using different characterization techniques such as UV-Vis-NIR spectroscopy, X-ray diffraction, atomic force microscopy, we demonstrate that both materials exhibit structural, morphological and optical properties that are suitable for solar cell applications. The optical constants of the films were calculated from the analysis of the transmittance and reflectance data in the spectral range 300-1800 nm. The band gap energy of both materials varied from 1.10 to 1.55 eV and from 3.27 to 3.08 eV depending on the sulphur and zinc content, respectively. X-ray diffraction patterns show that all Cu2ZnxFe1-xSnS4 and Zn(S,O) films were polycrystalline in nature with a preferential growth along (112) and (002) planes, respectively.

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