Vivek Bhusari; Amit Bansiwal; Sadhana Rayalu
Abstract
Mixed oxide nanoparticles of iron and aluminium (FeAlO) were synthesized by combustion process and evaluated for the removal of chromium by adsorption from aqueous solution. The FeAlO were characterized for various physico-chemical properties using x ray diffraction, particle size, SEM, TEM, FTIR analysis. ...
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Mixed oxide nanoparticles of iron and aluminium (FeAlO) were synthesized by combustion process and evaluated for the removal of chromium by adsorption from aqueous solution. The FeAlO were characterized for various physico-chemical properties using x ray diffraction, particle size, SEM, TEM, FTIR analysis. The adsorbent was evaluated to study the effect of different parameters like dose, pH and interference of other ion on removal efficiency. The data was fitted in Langmuir and Freundlich adsorption parameters were computed to determine adsorption capacity. The adsorption isotherm was best fitted for Freundlich adsorption model and adsorption capacity was 0.824mg g-1 for Cr (VI). The FeAlO has good potential for the removal of Cr(VI) from water and wastewater.
Suhad Sbeih; Werner Steffen; Michael Kappl
Abstract
The demand for new advanced functional materials has driven scientific work over the past decades. Nature has been inspiring in the creation of different types of self-cleaning and super repellent surfaces mimicking those of plants (lotus leaves), animals (shark skin) or insects (butterfly wings, water ...
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The demand for new advanced functional materials has driven scientific work over the past decades. Nature has been inspiring in the creation of different types of self-cleaning and super repellent surfaces mimicking those of plants (lotus leaves), animals (shark skin) or insects (butterfly wings, water strider). To produce and maintain super repellent materials, chemical modification of the surface by using low surface energy materials such as fluoropolymers and/or siloxanes is necessary. Also, physical modification of surface roughness enhances super-repellency against various liquids. The surface roughness can be achieved e.g., by the deposition of nano particles (NPs) using Liquid Flame Spray (LFS). Industrial applications like paper coatings, oil-water separation, and microfluidic devices have benefited from the fabrication of super-hydrophobic surfaces by LFS. In our work, glass substrates were fluorinated by chemical vapor deposition (CVD) method, and others were additionally pre-coated with silica NPs by LFS. The coated glass surfaces were characterized for their anti-wettability by measuring the contact angles of water and compare that to bare glass. The influence of the produced coatings on the wettability of surface with different liquids was examined through measuring advancing/receding contact angles as well as the roll off angle. Results showed that compared to bare glass only fluorination of glass increased the water static contact angle from 18 to almost 112 . This is indicative of hydrophobic behaviour. Coating glass with silica NPs by LFS before fluorination, enhanced the water anti-wetting property for super hydrophobicity. LFS coating provided good oleophobic characteristic.
Jitendra Pal Singh; So Hee Kim; Weon Cheol Lim; Sung Ok Won; Keun Hwa Chae
Abstract
In the present work, we have reported the synthesis of calcium hydroxide from calcium nitrate. Synthesized nanoparticles were characterized using X-ray diffraction, scanning electron micrographs, and near edge X-ray absorption fine structure measurements. Synthesized nanoparticles exhibit tetragonal ...
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In the present work, we have reported the synthesis of calcium hydroxide from calcium nitrate. Synthesized nanoparticles were characterized using X-ray diffraction, scanning electron micrographs, and near edge X-ray absorption fine structure measurements. Synthesized nanoparticles exhibit tetragonal phase with space group P3m1. These nanoparticles exhibit almost spherical shape. Particle size of these nanoparticles are 55 nm and 69 nm for two different treatment of precursor. Microscopic studies shows that size distribution is affected by the change of thermal history. Local electronic structure measured at Ca (L- & K-) and O K-edges exhibit presence of spectral features that are characteristics of calcium hydroxide. Moreover, strength and magnitude of crystal field parameter is unaffected by thermal treatment utilized for synthesis of these materials. Copyright © 2018 VBRI Press.
Swati Tapdiya; Ashwani K. Shrivastava; Sarika Singh
Abstract
Manganese substituted Cobalt Ferrite Co1-xMnxFe2O4() nanoparticles were prepared using low temperature chemical co-precipitation method. All the samples were annealed at 900°C for 3 hours. The crystal lattice symmetry and phase purity were performed by X-ray diffraction (XRD). The varying dopent ...
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Manganese substituted Cobalt Ferrite Co1-xMnxFe2O4() nanoparticles were prepared using low temperature chemical co-precipitation method. All the samples were annealed at 900°C for 3 hours. The crystal lattice symmetry and phase purity were performed by X-ray diffraction (XRD). The varying dopent concentration affects the crystalline size, surface morphology and magnetic properties of the cobalt ferrite. The particle sizes are found to be in the range of 29-37 nm. SEM with EDAX examines the morphological and compositional analysis of the nanoparticles. EDAX confirms the presence of Co, Mn, Fe and O. Fourier transform infrared spectroscopy (FTIR) study confirms the formation of spinel ferrite. The saturation magnetization, magnetic remanence and coercive field of CoMn nanoparticles are obtained at room temperature. Saturation magnetization initially increases and then decreases for higher value of dopent, which shows applicability of these materials for recording media and magnetic data storage. Copyright © 2017 VBRI Press.
Kate Kotlhao; Moloko D.T. Madiseng; Fanyana M. Mtunzi; Vusumzi E. Pakade; Sekomeng J. Modise; Neelan Laloo; Michael J. Klink
Abstract
Three different types of nanoparticles were synthesised in this study, viz silver (Ag), zinc oxide (ZnO) and titanium dioxide (TiO2) using different chemical methods. These materials were then characterised using Transmission Electron Microscopy (TEM), Fourier Transform Infra-Red Spectroscopy (FTIR), ...
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Three different types of nanoparticles were synthesised in this study, viz silver (Ag), zinc oxide (ZnO) and titanium dioxide (TiO2) using different chemical methods. These materials were then characterised using Transmission Electron Microscopy (TEM), Fourier Transform Infra-Red Spectroscopy (FTIR), Ultraviolet Visible Spectroscopy (UV-Vis) and Thermal Gravimetric Analysis (TGA). The materials were also tested for anti-bacterial activity. TEM showed that the particles were in the nano-size range (1 – 100 nm). FTIR and UV-Vis Spectroscopy showed the different absorption bands of the synthesised nanoparticles, respectively. Silver nanoparticles showed greater antibacterial activity against several bacteria than titanium dioxide and zinc oxide nanoparticles. The highest inhibition was observed for Klebsiella pneumoniae. The results showed that antimicrobial activity of nanoparticles increases with increasing concentration of the nanoparticles. Copyright © 2017 VBRI Press.
Praveenkumar R. Upadhyay; Vivek Srivastava
Abstract
Stable, well dispersed and agglomeration free Ru metal doped TiO2 nanoparticles were produced by a sol gel method (with and without ionic liquid reaction medium). Such unique physiochemical properties of Ru-TiO2-IL catalyst were utilized as catalysts for CO2 hydrogenation reaction in task specific ionic ...
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Stable, well dispersed and agglomeration free Ru metal doped TiO2 nanoparticles were produced by a sol gel method (with and without ionic liquid reaction medium). Such unique physiochemical properties of Ru-TiO2-IL catalyst were utilized as catalysts for CO2 hydrogenation reaction in task specific ionic liquid medium. Low catalysts loading, moisture/air stability, high selectivity, easy catalyst synthesis protocol as well as stress-free reaction condition along with 5 times catalysts recycling are the major outcomes of the proposed report. Copyright © 2017 VBRI Press.
Nandini Sharma; Ranjana Jha
Abstract
Zinc oxide nanoparticles were synthesized utilizing a green and simple sonochemical route. The synthesized ZnO nanoparticles were characterized for the analysis of structural and optical properties. Characterization with XRD and TEM shows that the synthesized particles were uniformly distributed, crystalline ...
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Zinc oxide nanoparticles were synthesized utilizing a green and simple sonochemical route. The synthesized ZnO nanoparticles were characterized for the analysis of structural and optical properties. Characterization with XRD and TEM shows that the synthesized particles were uniformly distributed, crystalline in nature with spherical shape and narrow size distribution of particles (48-50 nm). UV-Vis and PL spectra shows optical band gap to be 3.5 eV and ZnO sample possess fewer defect states. ZnO nanoparticles synthesized shows good optical properties and was observed to be a promising candidate to be used in thin film solar cells. Copyright © 2017 VBRI Press.
Paviter Singh; Manpreet Kaur; Gurpreet Kaur; Bikramjeet Singh; Kulwinder Singh; Harpreet Kaur; Mandeep Singh; Manjeet Kumar; Rajni Bala; Ramovatar Meena; Akshay Kumar
Abstract
Boron carbide is well known metallurgical product used in cutting/coating tool industry. Nanostructured boron carbide finds its application in medical, optical and defence industry due to its structural, mechanical and optical properties. In present paper, we report the effect of processing parameters ...
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Boron carbide is well known metallurgical product used in cutting/coating tool industry. Nanostructured boron carbide finds its application in medical, optical and defence industry due to its structural, mechanical and optical properties. In present paper, we report the effect of processing parameters (reaction time and temperature/pressure) on the synthesis of nanostructured boron carbide. Detailed X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM and TEM) analysis was done along with theoretical studies of pressure. Results show that the best temperature for synthesis of nanoscale boron carbide is 800 °C. Copyright © 2017 VBRI Press.
Shiva Sharma; Pratima Chauhan; Shahid Husain
Abstract
Mn2O3 nanoparticles have been synthesized using chemical co-precipitation method. The as synthesized nanoparticles were characterized by X-ray diffractometer (XRD), UV-Visible spectrophotometer (UV-Vis) and Fourier Transform Infra-Red (FTIR) spectrophotometer method. The results indicate that synthesized ...
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Mn2O3 nanoparticles have been synthesized using chemical co-precipitation method. The as synthesized nanoparticles were characterized by X-ray diffractometer (XRD), UV-Visible spectrophotometer (UV-Vis) and Fourier Transform Infra-Red (FTIR) spectrophotometer method. The results indicate that synthesized Mn2O3 nanoparticles possessed crystallites having sizes 12.56 nm and 11.90 nm with cubic and orthorhombic structures respectively. The two samples are named as M1 and M2. The gas response of both the samples was investigated for different concentrations of NH3 gas at room temperature. Sample M2 based thick film sensor showed enhanced sensing performance in comparison to sample M1. This is attributed to smaller crystallite size of sample M2. The sample M2 based sensor showed the response of 67.1% with the response and recovery times 65 and 71 sec respectively. The fabricated nanoparticles show promising use as room temperature NH3 sensors.