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Anwane S.W.,Shri Shivaji Science College
Advanced Materials Letters

Optimum alio-valent doping with yttrium sulphate creating 7% vacancy concentration provided promising features from sensor application view. This provides a better option over green Silver Sulphate. The sensors fabricated with the modified sulphate based silver ion conducting solid electrolyte, silver-silver sulphate reference electrode and test gas (Pt) electrodes has been tested over the range of 50-1000 ppm SO2 blended in constant oxygen-partial pressure and argon at 400°C. A promising sensor characteristic behaviour is exhibited by the modified electrolyte - solid solution of silver sulphate with yttrium. © 2012 VBRI Press. Source

Anwane S.W.,Shri Shivaji Science College
Advanced Materials Letters

Composite materials which are heterogeneous mixtures of two or more solid phases offer value added properties for device applications. When ion conducting Ag2SO4 is dispersed with insulating BaTiO3, enhanced electrical properties are observed along with improved surface morphology. The electrical properties have been derived from the Complex Impedance Spectroscopic studies. Arrhenius Plot, Concentration and Temperature dependent conductivity and activation energy have also been studied. The ionic transference number of the composite system remains unchanged on dispersion thereby retaining its category as Solid Ionic Conductor (SIC). Moreover, 30 Wt% BaTiO3 dispersed in Ag2SO4 offers promisingly enhanced ionic conductivity and reduced activation energy of ion migration. This material has further scope for its utilization as a silver ion conductor in electrochemical applications like solid state batteries, gas sensors etc. The results obtained fit well in the established theories of composites. © 2013 VBRI press. Source

Hete Y.V.,Rashtrasant Tukadoji Maharaj Nagpur University | Gholase S.B.,Rashtrasant Tukadoji Maharaj Nagpur University | Khope R.U.,Shri Shivaji Science College
E-Journal of Chemistry

This study is carried out for the removal of cobalt from aqueous solution using granular activated carbon in combination with p-nitro benzoic acid at temperature 25±1 °C. The adsorption isotherm of cobalt on granular activated carbon has been determined and the data fitted reasonably well to the Langmuir and Freundlich isotherm for activated carbon. Source

Thakare Y.S.,Shri Shivaji Science College | Malkhede D.D.,University of Pune
Separation Science and Technology (Philadelphia)

Gallium(III) was extracted at pH 3.5 by equilibrating eight min with 10 mL of 0.0001 M acetyl derivative of calix(6)arene in xylene. Gallium(III) was stripped quantitatively with 0.1 N hydrochloric acid and determined spectrophotometrically with 0.01% PAR at 510 nm. The nature of the extracted species was determined from the log-log plots and its stoichiometry was confirmed by numerical treatment to experimental data. The IR analysis of Ga(III) loaded organic phase was also studied. The conformational change of reagent during complex formation was studied from the 1H NMR treatment. The temperature dependence of the extraction equilibrium and metal loading capacity of the reagent was also evaluated. The proposed method was successfully applied for the extraction and separation of multicomponent mixtures, synthetic mixtures, and binary and ternary separation of gallium from the associated elements. The results obtained were reproducible and accurate. © 2014 Copyright Taylor & Francis Group, LLC. Source

Patil Sahadeo D.,Shri Shivaji Science College | Kamble Vilas A.,Adarsha Science
International Journal of Pharma and Bio Sciences

Essential oils are well known in traditional medicine as antiseptic and antimicrobial agents. This study determined the antimicrobial effects of eleven spice essential oils using a disc diffusion method against four Gram-positive and eight Gramnegative bacteria of spoilage and health significance. Cassia oil showed the largest zones of inhibition (12 to 54 mm) and the widest antibacterial spectrum, followed by essential oil of allspice, clove and nutmeg. Essential oils of mace, celery, ginger, cardamom, black pepper, fennel and turmeric were the least effective spice oils. Grampositive bacteria were shown to be more sensitive to the spice essential oils than Gramnegative bacteria. Staphylococcus aureus and Bacillus subtilis were the most sensitive bacterial strains tested; where as a strain of Escherichia coli (MTCC-118) was the least sensitive. These results showed that spice essential oils may prove useful in inhibiting bacteria of food spoilage and health significance. Source

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