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Kamble S.,Yashavantrao Chavan Institute of Science | Kumbhar A.,P.A. College | Jadhav S.,Shivaji University | Salunkhe R.,Shivaji University
Materials Today: Proceedings

The organic transformation carried out in suitable solvent as well as in presence of catalyst is more important due to its environmental impact. We try to optimize the organic transformation in aqueous hydrotropic solution because of it is a sustainable technique. Now days, the glycerine used as hydrotrope and it shows excellent hydrotropic properties. Glycerine has been show combine advantages of water like non-toxic, colourless, odourless liquid, large availability, renewability due to this important properties it recently proposed as a valuable green solvent. © 2015 Elsevier Ltd. Source

Kumbhar V.S.,Shivaji University | Lokhande A.C.,Sinhgad Institute of Technology | Gaikwad N.S.,Yashavantrao Chavan Institute of Science | Lokhande C.D.,Shivaji University
Materials Science in Semiconductor Processing

In the present letter, a novel aqueous chemical method is employed to prepare thin film of Sm2S3 material containing porous network of interconnected nanoparticles for super-capacitive application. The orthorhombic phase formation of Sm2S3 film is concluded from X-ray diffraction study. The chemical states of samarium and sulfur are determined using X-ray photoelectron spectroscopy study. The pseudocapacitive behavior of Sm2S3 showed a maximum specific capacitance of 248 F g-1 in 1.5 M LiClO4 electrolyte prepared in propylene carbonate electrolyte. The nature of charge and discharge curves confirmed pseudocapacitive behavior of film electrode. The highest power and energy densities of 15.6 kWh kg-1 and 54.6 Wh kg-1, respectively are obtained. An electrochemical stability of 94% is retained after 1500 cycles. © 2015 Elsevier Ltd. All rights reserved. Source

Kumbhar V.S.,Shivaji University | Lokhande A.C.,Sinhgad Institute of Technology | Gaikwad N.S.,Yashavantrao Chavan Institute of Science | Lokhande C.D.,Shivaji University
Ceramics International

The Sm2S3 thin films with diffused nanoflakes morphology are prepared by an environment-friendly facile chemical synthesis method and used in electrochemical supercapacitors. The structural, elemental and surface morphological characterization are carried out using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM) and wettability techniques. The FESEM images show tree root like distribution of flakes with average flake width of about 80 nm. The film surface is lyophilic with propylene carbonate contact angle of 21°. The supercapacitive measurements are carried out through cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy (EIS) techniques. The Sm2S3 film electrode exhibited a highest specific capacitance (Cs) of 213 Fg-1 at 5 mVs-1 scan rate in LiClO4-propylene carbonate electrolyte. Asymmetric nature of charge-discharge curves confirmed pseudocapacitive behavior of electrode with energy and power densities of 39.39 Whkg-1 and 4.33 kWkg-1, respectively. An equivalent series resistance of 0.44 Ωcm-2 indicated negligible ohmic losses in charge storage. An electrochemical stability of 81.47% is retained after 1000 cycles indicating that Sm2S3 is a promising candidate for supercapacitor application. © 2015 Elsevier Ltd and Techna Group S.r.l. Source

Ahire M.L.,University of Pune | Ahire M.L.,Yashavantrao Chavan Institute of Science | Laxmi S.,University of Pune | Walunj P.R.,University of Pune | And 2 more authors.
Journal of Plant Biochemistry and Biotechnology

Growth, osmotic adjustment, antioxidant enzyme defense and principle medicinal component bacoside A was studied in in vitro raised shoots of Bacopa monnieri under different concentrations of KCl and CaCl2 (0, 50, 100, 150 or 200 mM). Significant reduction was observed in shoot number per culture; shoot length, fresh weight, dry weight and tissue water content (TWC) when shoots were exposed to increasing KCl and CaCl2 concentrations (50–200 mM) as compared to control. Minimum damage to the membrane as assessed by malondialdehyde (MDA) content was noticed in control in contrast to sharp increase in KCl and CaCl2 stressed shoots. Higher amounts of free proline, glycine betaine and total soluble sugars (TSS) accumulated in KCl and CaCl2 exposed shoots compared to the controls. Among different concentrations of KCl and CaCl2, increasing concentration of CaCl2 showed more increase in osmolyte accumulation. Na+ content decreased with increasing concentrations of KCl and CaCl2. Accumulation of K+ increased significantly in KCl (50–100 mM) stressed shoots as compared to control, while it decreased in CaCl2 treated shoots indicating that it prevents the uptake of K+ ions. Ca2+ accumulation significantly increased with increasing concentrations of CaCl2 up to 150 mM but decreased at higher concentrations. Shoots treated with KCl and CaCl2 (0–100 mM) showed higher antioxidant enzyme (SOD, CAT, APX and GPX) activities but KCl suppressed the activities at higher concentrations. Accumulation of bacoside A was enhanced with an increase in KCl and CaCl2 concentration up to 100 mM. It appears from the data that accumulation of osmolytes, and elevated activities of antioxidant enzymes play an important role in osmotic adjustment in shoot cultures of Bacopa and the two salts tested have a positive effect on bacoside accumulation. © 2013, Society for Plant Biochemistry and Biotechnology. Source

Chavan J.J.,Yashavantrao Chavan Institute of Science | Gaikwad N.B.,Shivaji University | Kshirsagar P.R.,Shivaji University | Dixit G.B.,Shivaji University
South African Journal of Botany

The aim of present work was to assess the total phenolic content (TPC), total flavonoid content (TFC), phenolic compounds and antioxidant properties of various extracts of three Ceropegia spp.: Ceropegia spiralis, Ceropegia panchganiensis and Ceropegia evansii from Western Ghats of India. TPC of the samples varied from 0.3. ±. 0.2 to 28.5. ±. 0.3. mg TAE/g FW, whereas, TFC of the samples ranged between 0.1. ±. 0.1 and 15.3. ±. 0.3. mg RE/g FW. The major phenolic compounds identified were gallic acid, vanillin, cathechol and ferulic acid. All the extracts possess 1,1-diphenyl-2-picryl hydrazyl (DPPH) radical scavenging activity, ferric reducing antioxidant power (FRAP) as well as metal chelating ability and this was also supported by significant correlation with TPC and TFC. To the best of our knowledge, this is the first paper presenting comprehensive data on TPC, TFC, phenolic profile and antioxidant properties of the Ceropegia spp. © 2013 South African Association of Botanists. Source

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