Dr CHETANKUMAR KANUBHAI CHAUHAN
@mnc.edu.in
Associate Professor in Physics
M. N. College, Visnagar
EDUCATION
M.Sc., M.Ed., Ph.D.
RESEARCH, TEACHING, or OTHER INTERESTS
Materials Science, Biomaterials
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Rakesh Hajiyani, Bhoomika Jogiya, Chetan Chauhan, Harshkant Jethva, and Mihir Joshi
Author(s)
Rakesh R. Hajiyani, Chetankumar K. Chauhan, and Mihir J. Joshi
Asian Journal of Chemistry
Bis-thiourea nickel barium chloride was synthesized and crystals were grown by slow aqueous solvent evaporation technique. The powder XRD analysis of grown crystal was suggested to have orthorhombic crystal structure. The unit cell parameters of grown crystal as: a = 9.70 Å, b = 10.68 Å and c = 17.95 Å. The contents of nickel and barium in the grown crystals was analyzed using EDAX. The presence of various functional groups was confirmed by FTIR spectroscopy studies. From the UV-visible spectrum, the material has about 90 % optical transparency in the entire visible region. From the thermogravimetric analysis, it was found that the crystals remained stable up to 170 ºC. The endothermic reactions were identified from the differential thermal analysis.
K. R. Rathod, B. V. Jogiya, C. K. Chauhan, and M. J. Joshi
AIP Publishing LLC
Struvite, Ammonium Magnesium Phosphate Hexahydrate [(AMPH) - (NH4)MgPO4.6(H2O)], is one of the fascinating inorganic phosphate minerals. Struvite is one of the components of the urinary stones. Struvite occurs as crystallites in urine and grows as a type of kidney stone. In this study, struvite nano particles were synthesized by wet chemical technique. The aqueous solutions containing dissolved Mg(CH3COO)2.4H2O and (NH4)H2PO4 mixed at the Mg/P molar ratio of 1.00. The synthesized struvite nano particles were characterized by XRD, FT-IR, Thermal Analysis and TEM. From XRD, crystal structure of the nano particle was found to be orthorhombic and crystalline size was found to be within 11 to 26 nm. The FT-IR spectrum for the struvite nano particles confirmed the presence of a water molecule and metal-oxygen stretching vibration, O-H stretching and bending, N-H bending and stretching, P-O bending and stretching vibrations. The Thermal Analysis was carried out from room temperature to 900°C. From TEM analysis, ...
Chetan K. Chauhan and Mihirkumar J. Joshi
Elsevier BV
Chetan K. Chauhan and Mihir J. Joshi
Elsevier BV
C. K. Chauhan, P. M. Vyas, and M. J. Joshi
Wiley
AbstractStruvite‐K is the natural potassium equivalent to Struvite. Struvite‐K crystals were grown by single diffusion gel growth technique in silica hydro gel medium. Struvite‐K crystals with different morphologies having transparent to translucent diaphaneity were grown with different growth parameters. The phenomenon of Liesegang rings was also observed with some particular growth parameters. The crystals were characterized by powder XRD, FT‐IR, TGA and dielectric study. The powder XRD results of Struvite‐K confirmed the orthorhombic crystal structure. The FT‐IR spectrum proved the presence of water of hydration, metal – oxygen bond and P – O bond. The TGA, DSC and DTA were carried out simultaneously. It was found that crystals started dehydrating and decomposing from 75 °C and finally at 600 °C temperature it became 64.14% of the original weight and remained almost constant up to the end of analysis. From the thermo‐gravimetry, the numbers of the water molecules associated with the crystal were calculated and found to be 5. The kinetic and thermodynamic parameters of dehydration / decomposition process were calculated. The variation of dielectric constant with frequency of applied field was studied in the range from 400 Hz to 100 kHz, which exhibited the decreasing nature of the dielectric constant as frequency increased. The dielectric study showed that a.c. conductivity increased and consequently the a.c. resistivity decreased with the increase in frequency. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
R. R. HAJIYANI, D. J. DAVE, C. K. CHAUHAN, P. M. VYAS, and M. J. JOSHI
World Scientific Pub Co Pte Lt
Bis-thiourea strontium chloride was synthesized and single crystals were grown by the slow solvent evaporation technique using aqueous solvent. The solubility curve was obtained and the determination of the induction period as well as the evaluation of kinetic parameters of nucleation was carried out. The powder XRD analysis suggested orthorhombic crystal structure. The FT-IR spectrum confirmed the presence of various functional groups. The thermo-gravimetry analysis was carried out and the crystals were found to be stable up to 170°C. Applying Coats and Redferm relation to the thermo-gram, the kinetic and thermodynamic parameters of dehydration were calculated. The dielectric study was carried out in the frequency range of applied field from 500 Hz to 1 MHz. The variations of dielectric constant, dielectric loss, AC resistivity and AC conductivity were studied with frequency. It was found that the dielectric constant and the dielectric loss decreased as the frequency of applied field increased, whereas the AC resistivity increased as the frequency increased.
C. K. Chauhan, M. J. Joshi, and A. D. B. Vaidya
Springer Science and Business Media LLC
C.K. Chauhan, M.J. Joshi, and A.D.B. Vaidya
Science Publications
C. K. Chauhan and M. J. Joshi
Springer Science and Business Media LLC