Time filter

Source Type

Amrāvati, India

Kalyamwar V.S.,Bharatiya Mahavidyalaya | Raghuwanshi F.C.,Vidyabharati Mahavidyalaya
Advanced Materials Letters | Year: 2013

Zinc oxide nanostructures were synthesized by chemical route method. The XRD spectrum indicates that the sample is wurtezite (hexagonal) structured ZnO with lattice constants of a = 3.249A0, c = 5.206 A0. Thick films of synthesized ZnO were prepared by screen printing technique. The TiO2 modified ZnO were obtained by dipping them into an aqueous solution of titanium tetrachloride for different interval of time. Gas sensing properties of pure and modified ZnO thick films were investigated. The TiO2 modified ZnO thick film dipped for 5 min were observed to be more sensitive as compared to other modified thick films at 1250C. The effect of surface microstructure and TiO2 concentrations on the sensitivity, selectivity, response and recovery of the sensor in the presence of NH3 and other gases ware studied and discussed. © 2013 VBRI press.

Mandakmare A.U.,Bharatiya Mahavidyalaya | Narwade M.L.,Vidyabharati Mahavidyalaya | Tayade D.T.,G.V. I. H. S | Naik A.B.,Sant Gadge Baba Amravati University
Russian Journal of Physical Chemistry A | Year: 2014

Density, ultrasonic velocity of pure dioxane (Dx) and ligands, 4,6-dimethyl-7-hydroxycoumarin (L1), 6-ethyl-7-hydroxy-4-methylcoumarin (L2), and 3-chloro-7-hydroxy-4-methylcoumarin (L3) in different percent of Dx-water mixture have been investigated at 303.15 K. Acoustical parameters such as adiabatic compressibility (β), intermolecular free length (L f ), acoustical impedance (Z), relative association (R A ), apparent molar compressibility (Φβ), and apparent molar volume (Φ V ) have also been evaluated from the experimental data of density and ultrasonic velocity. An excellent correlation between a given parameters is observed at all percent of dioxane-water and the result suggests nature of intermolecular interactions between the components. © 2014 Pleiades Publishing, Ltd.

Bandgar B.P.,University of Solapur | Adsul L.K.,University of Solapur | Chavan H.V.,University of Solapur | Jalde S.S.,University of Solapur | And 5 more authors.
Bioorganic and Medicinal Chemistry Letters | Year: 2012

A novel series of 3-(substituted)-aryl-5-(9-methyl-3-carbazole)-1H-2- pyrazolines (5a-o) has been synthesized and the structures of newly synthesized compounds were characterized by IR, 1H NMR and mass spectral analysis. All the synthesized compounds were evaluated for their in vitro and in vivo anti-inflammatory activity, and also for their antioxidant activity. Compounds 5b, 5c, 5d and 5n were found to be selective COX-2 inhibitors. Compound 5c was found to potent inhibitor of the carrageenin induced paw edema in rats. Most of the compounds exhibited good DPPH and superoxide radical scavenging activity, while compounds 5c, 5d, 5i and 5k exhibited good hydroxyl radical scavenging activity. Molecular docking result, along with the biological assay data, suggested that compound 5c was a potential anti-inflammatory agent. © 2012 Published by Elsevier Ltd.

Sonar A.S.,Lc Kherde Arts And Science Junior College | Solanki P.R.,Vidyabharati Mahavidyalaya
Asian Journal of Chemistry | Year: 2012

One of the most attractive concept in chemistry for sustainability is green chemistry, which is the utilization of a set of principles that reduces or eliminates the use or generation of hazardous substances in the design, manufacture and applications of chemical product. Microwave heating has attracted the attention of today's research worker. Reactions in microwave are currently in use for synthesis of medicinally important compounds. Within the framework of green chemistry we had synthesized 6-(substituted phenyl)-2H-imidazo[1,2- a] imidazol-3-one by cyclocondensation of 4-(substituted phenyl)-1H-imidazol-2(5H)-one/thione/imine with amino acids using PTC and triethyl benzyl ammonium chloride. Synthesized compounds have been tested for antimicrobial activity against Staphylococcus aureus, Escherichia coli, Salmonella typhi, Proteus vulgaris using cup-plate methodand their minimum inhibitory concentration (MICs) were determined using broth macrodilution method.

Kapse S.D.,G S College | Raghuwanshi F.C.,Vidyabharati Mahavidyalaya | Kapse V.D.,Science and Commerce College | Patil D.R.,Rl College
Current Applied Physics | Year: 2012

Nanocrystalline powders of Zn1-xCoxAl 2O4 (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) mixed oxides, with cubic spinel structure were successfully prepared by the ethylene glycol mediated citrate sol-gel method. The structure and crystal phase of the powders were characterized by X-ray diffraction (XRD) and microstructure by transmission electron microscopy (TEM). X-ray diffraction results showed that the samples were in single phase with the space group Fd-3m. TEM analysis showed that the powders with spherical shape were uniform in particle size of about 17-24 nm with mesoporous in nature. Further investigations were carried out by FT-IR. Thick films of as-prepared Zn1-xCoxAl 2O4 powders were fabricated using screen-printing technique. The response of Zn1-xCoxAl 2O4 based thick films towards different reducing gases (liquefied petroleum gas, hydrogen, hydrogen sulfide, ethanol gas and ammonia) was investigated. The sensor response largely depends on the composition, temperature and the test gas species. The Co (cobalt) content has a considerable influence on the gas-sensing properties of Zn1-xCo xAl2O4. Especially, Zn0.4Co 0.6Al2O4 composition exhibited high response with better selectivity to 100 ppm C2H5OH gas at 150 °C. The instant response (∼7 s) and fast recovery (∼16 s) are the main features of this sensor. © 2011 Elsevier B.V. All rights reserved.

Discover hidden collaborations