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A Review on Nanoparticles: Their Synthesis and Types …

Abstract:
Integrating multiple functionalities into a single nanoparticle (NP) is an important strategy to design hybrid materials for advanced applications. Recently, there has been a growing interest in the synthesis of heterodimeric metal–metal oxide NPs comprising nonprecious metal oxides owing to their unique magnetic, optical, and catalytic properties. The production of shape-controlled heterometallic NPs consisting of Pt and nonprecious metal oxides is crucial to demonstrate the composition–property relationship of NPs. Herein, a facile one-pot approach for the controlled synthesis of dumbbell-like Pt–Fe3O4–MnOx and dendritic Pt–MnOx NPs were reported. The key to the success of this synthesis is in changing the quantity of Fe(CO)5 additive to control the reaction kinetics. In the absence of Fe(CO)5, dendritic Pt–MnOx NPs were synthesized through the assembly of small seed NPs. On the other hand, dumbbell-like Pt–Fe3O4–MnOx NPs were obtained in the presence of Fe(CO)5 through controlling the nucleation and growth of Fe and Mn on the Pt NPs, followed by air oxidation. Compared to a Pt/graphene oxide (GO) catalyst, dumbbell-like Pt–Fe3O4–MnOx NPs on GO showed an enhancement of specific activity toward the oxygen reduction reaction owing to the compressive-strain effect exerted on the Pt lattice.

Biography:
Dr. Shah Mohd Ashraf after completing doctorial studies in Condensed Matter Physics, was appointed as Assistant Professor in National Institute of Technology Srinagar in year 1999. Here, Shah embarked upon new research programme, pioneered the synthesis of broad range of nanomaterials and established World Bank Funded Research Centre (Special Centre for Nanosciences) and laid the foundations to learn the new sciences-Nanotechnology in early twenties. In year 2009, shah moved to Middle East on deputation for a short period of two years and published book titled, "Principles of Nanoscience & Nanotechnology" with Dr. T. Ahmad, an eminent Chemist. Dr. Shah is teaching Nanotechnology, Materials Science and Materials Characterization from the last two decades and is actively engaged as reviewer /editor of many scientific journals. Shah has authored more than 75 international peer reviewed scientific papers in National and International journals and has written 5 Books on Nanotechnology and many Book Chapters with reputed international publishers. In his research, he has targeted bio-compatible and energy harvesting nano-materials, which has applications in day to day life. Shah has been awarded two major projects by the Govt of India under Nano-Mission and leadership qualities in taking lead role in innovative programmes have been acknowledged on many occasions. Shah has delivered invited talks in number of international forums. Dr. shah is also a member of many science academies and societies and his work has been cited by number of scientific reporters as well as scientific media. Organiser and Chair of several national and international symposia, schools and conferences which includes 3rd Int. Conference on "Nanotechnology for Better living" from 25-29 May 2016 in collaboration with IIT Kanpur. In his spare time, Dr. Shah is regularly organising INSPIRE internship programme launched by Hon’ble Prime Minister of India for the bright and genius students of the Kashmir Valley, which aims to attract talented students for the study of Science and Technology in early age which ultimately will bring peace across the globe.

A Review on Nanoparticles: Their Synthesis and Types

A Review on Nanoparticles: Their Synthesis and Ty pes .

Biopolymer-assisted synthesis of yttrium oxide nanoparticles ..

Abstract:
Electrochemical sensors for glucose can be divided into enzymatic and non-enzymatic. Enzymatic sensors are more specific in glucose determination. On the other hand non-enzymatic sensors are more chemically and thermally stable. Devices based on the synergistic effect of carbon nanostructures, conductive polymers and noble metal nanoparticles can be successfully used as enzymatic (using GOx) and non-enzymatic (without GOx) sensors for glucose detection. In this work, composite material containing GQDs, PPyNPs and AuNPs was synthesized and applied in both types of electrochemical sensors. Constructed systems were electrochemically characterized by voltammetric methods and their sensitivity towards glucose was examined.

Abstract:
Heterogeneous photo-catalysis is an advanced oxidation process (PAO), which has been the subject of numerous studies and applications, particularly using the commercial oxide of TiO2 (P25, Evonik). Zinc oxide (ZnO) has often been considered a valid alternative to TiO2 due to its good opto-electronic, catalytic and photochemical characteristics along with its low cost. In order to improve the photocatalytic performance of ZnO for practical applications, various types of synthetic approaches have been developed, including, among others, the hydrothermal / solvothermal growth method, sol-gel method, ultrasonic assisted method, deposition chemistry in vapor phase, etc. with the aim of preparing ZnO particles with different sizes and morphologies. However, all of these methods require relatively severe reaction conditions such as high temperature, sophisticated techniques, high purity of gases, adjustable gas flow, expensive raw materials, etc. Therefore, it is important to find a simple and cost-effective method for the synthesis of crystalline nano-particles of ZnO. For this reason, in the present work, the ZnO has been synthesized by three different procedures: conventional aqueous precipitation method, hydrothermal method (H) and microwave assisted method (MW). In all three processes, the same material is obtained, hydrocincite [Zn5(CO3) 2(OH)6], which evolves to crystalline ZnO after calcination thermal treatments. We investigated the effect of the calcination temperature, at the same time (2 h), on the optical, textural and structural properties. Photo-catalytic studies were performed using two selected substrates, Methyl Orange and Phenol, as toxic model substrates (one colorant and the other transparent). The catalysts prepared were characterized by several techniques: DRX, SBET, FE-SEM, TEM and UV-Vis (in diffuse reflectance mode).From the results of XRD, it has been possible to establish that a minimum difference between the relative intensities of exposed faces (I100 and I002) is a crucial factor to obtain good photocatalytic properties. This minimum difference is achieved, in our cases by thermal treatments of calcination at 400ºC, 2 h. When this temperature is chosen, there is no appreciable variation between the photocatalytic activities of the oxides of zinc obtained by the three processes, and there are small differences depending on the nature of the substrate chosen, which can be attributed to the textural differences between the oxides. In any case, the obtained zinc oxides show, for each substrate, photo-catalytic activities in the UV that are superior to those presented by the widely used commercial oxide TiO2 (P25) used as reference.

Synthesis and thermal characterization of Al2O3 nanoparticles

Abstract:
Heterogeneous photo-catalysis is an advanced oxidation process (PAO), which has been the subject of numerous studies and applications, particularly using the commercial oxide of TiO2 (P25, Evonik). Zinc oxide (ZnO) has often been considered a valid alternative to TiO2 due to its good opto-electronic, catalytic and photochemical characteristics along with its low cost. In order to improve the photocatalytic performance of ZnO for practical applications, various types of synthetic approaches have been developed, including, among others, the hydrothermal / solvothermal growth method, sol-gel method, ultrasonic assisted method, deposition chemistry in vapor phase, etc. with the aim of preparing ZnO particles with different sizes and morphologies. However, all of these methods require relatively severe reaction conditions such as high temperature, sophisticated techniques, high purity of gases, adjustable gas flow, expensive raw materials, etc. Therefore, it is important to find a simple and cost-effective method for the synthesis of crystalline nano-particles of ZnO. For this reason, in the present work, the ZnO has been synthesized by three different procedures: conventional aqueous precipitation method, hydrothermal method (H) and microwave assisted method (MW). In all three processes, the same material is obtained, hydrocincite [Zn5(CO3) 2(OH)6], which evolves to crystalline ZnO after calcination thermal treatments. We investigated the effect of the calcination temperature, at the same time (2 h), on the optical, textural and structural properties. Photo-catalytic studies were performed using two selected substrates, Methyl Orange and Phenol, as toxic model substrates (one colorant and the other transparent). The catalysts prepared were characterized by several techniques: DRX, SBET, FE-SEM, TEM and UV-Vis (in diffuse reflectance mode).From the results of XRD, it has been possible to establish that a minimum difference between the relative intensities of exposed faces (I100 and I002) is a crucial factor to obtain good photocatalytic properties. This minimum difference is achieved, in our cases by thermal treatments of calcination at 400ºC, 2 h. When this temperature is chosen, there is no appreciable variation between the photocatalytic activities of the oxides of zinc obtained by the three processes, and there are small differences depending on the nature of the substrate chosen, which can be attributed to the textural differences between the oxides. In any case, the obtained zinc oxides show, for each substrate, photo-catalytic activities in the UV that are superior to those presented by the widely used commercial oxide TiO2 (P25) used as reference.

Abstract:
Widely spread of chemically industry producing many types of environmentally pollutants (e.g dyes, herbicides, pesticides, insecticides, drugs, bacteria and others), most of these pollutants reach our drinking water resources, different strategies have been followed to purify contaminated water, one of the low-cost technology is using semiconductors as catalyst for photodegradation of water-organic contaminants. TiO2 nano- and microparticles have been used for photo-degradation of widely spread water organic contaminants. Due to its wide band gap (~3.2 eV) TiO2 photo-catalytic activity is limited to shorter wavelengths only (UV region). As only ~4% of the solar spectrum falls in the UV region, smaller bandgap semiconductors (e.g. CdS, with 2.3 eV) are used to sensitize TiO2 particles. The TiO2/CdS system has been used as a catalyst in water purification by photo-degradation of organic contaminants such as methyl orange and Phenazopyridine (Medically active compound). However, the TiO2/CdS system is unstable under photodegradation conditions yielding hazardous Cd2+ ions. Alternative ZnO nanoparticles naked and substrate to different materials like (clay, sand, and activated carbon) were used in photodegradation process; also natural dyes (anthocyanin & Curcumin) were used as a sensitizer for the TiO2 nanoparticles. The different prepared nano-catalyst systems were used to photo-degrade various contaminants of water and soil, such as methyl orange, phenazopyridine, paracetamol, phenols, and halo-phenols, with solar radiation. Furthermore, the ZnO nanoparticles were used in water purification and disinfection (from bacteria that cause water contamination) by complete mineralization under solar light. Different reaction parameters (such as catalytic efficiency, effects of catalyst concentration, catalyst recovery, contaminant concentration, temperature, pH and complete mineralization) will be discussed together.

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Alumina Al2O3 Powder / Aluminum Oxide Powder (Al2O3…


Aluminum Oxide Nanoparticles Al2O3 ..

Title of Talk: Iron oxides magnetic nanoparticles - catalysts that mimic enzymes and causes the effects of magnetic field on the viscosity, the deposition of paraffin and a number of other industrial processes.

Modifying the Surface Properties of Superparamagnetic …

Abstract:
Inorganic fertilizers along with high yielding varieties have contributed immensely for success of green revolution. Increasing pressure towards food production globally demands unconscientious fertilizer usage in future as well. Nitrogenous fertilizers are the extensively used fertilizers but also suffer huge losses from agriculture ecosystem due to faster rate of release which is not synchronized with crop demand. Thus resulting in low nitrogen use efficiency. In order to have a sustained release of nitrogen from fertilizer, nanoparticle coated with urea is an effective option. We report urea coated hydroxyapatite based nanofertilizer and its performance on aerobic paddy. In this study hydroxyapatite (HA) nanoparticles were synthesized by adding orthophosphoric acid to calcium hydroxide solution under constant vigorous stirring. Saturated urea solution was added to the HA particle suspension and was stirred continuously for 12 hours for surface modification. The urea modified HA particles were washed and dried at 65ºC. Hydroxyapatite nanoparticles (HA) and urea coated hydroxyapatite nanoparticles (UHA) were characterized using Dynamic Light Scattering (DLS), Scanning Electron Microscope (SEM), Powder X-ray Diffraction (PXRD) and Fourier Transform Infrared (FTIR) Spectroscopy. Nitrogen content of UHA was analyzed using Kjeldahl method. Nitrogen content of UHA particles was found to be 36% and Zeta potential was 165.0 mV indicating stable nanodispersion. PXRD pattern of UHA particles indicated the presence of peaks due to hydroxyapatite and urea. SEM images of UHA particles exhibited oblong structures resembling rice grains with diameter less than 90 nm. FTIR spectroscopy showed prominent peaks around γmax/cm–1 1041 indicating phosphate group in hydroxyapatite and γmax/cm–1 3336 and 3432 indicating presence of urea. Synthesized nanofertilizer was evaluated on aerobic paddy under completely randomized design and was compared with recommended dose of conventional urea (100kgN/ha) in aerobic paddy. Nanofertilizer at 25% of recommended dose recorded highest grain yield. Nanofertilizer@ 50% dose showed similar performace to 100% dose of conventional urea. The results indicate amount of fertilizer application into soil can be reduced than regular dosage with nanofertilizer without affecting the yield. This will reduce environmental pollution of water and soil without compromising agricultural production.

SAPO-34 - Molecular Sieves - Materials

Biography:
M. Kraini received a Phd Degree in Physics in 2016 from the University of Monastir. Currently, he is a membre at the Laboratory of Physics of Materials and Nanomaterials Applied at Environment, Gabes, Tunisia. His main research interests are the synthesis and characterization of nanoparticles and thin films for a variety of applications.

Linear formula (SiO2)x(Al2O3)y(P2O5)z

Abstract:
In this study, both chemical precipitation and mechanical milling techniques were used to synthesize either Fe nano-particles or mixed Fe, Al, Ti nano-composites using iron rich industry waste such as red mud as precursor. Further heat treatment of chemically and mechanically treated red mud lead to in-situ formation of nano-sized particles or composites. Such metal matrix composites have attracted much attention due to its use as structural materials in automotive and transportation industries because of their low density, high specific modulus, strength, wear and corrosion resistance. The present work used iron and titanium rich fraction of chemically treated iron rich industrial rejects for preparation of value added Fe and Fe-Al-Ti nano-material. The structural transformation behavior from bulk to nano at different temperatures has been assessed by XRD and SEM. SEM results clearly show that chemical precipitation produced Fe nano-crystals that were obtained after using Fe enriched chemically treated red mud residue whereas mixed nano-material were obtained after mechanical milling.

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