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Kadam P.M.,Smt Kasturbai Walchand College | Tarwal N.L.,Shivaji University | Mali S.S.,Shivaji University | Deshmukh H.P.,Ym College | Patil P.S.,Shivaji University
Electrochimica Acta | Year: 2011

In the present investigation, the structural, morphological and electrochromic properties of multiwalled carbon nanotubes (MWCNT)-tungsten oxide (WO 3) composites were investigated. The WO 3 thin films were prepared by patented pulsed spray pyrolysis technique (PSPT) onto ITO coated glass substrates. A reticulated mesh like structure suitable for embedding is achieved by optimizing the deposition parameters. The functionalized MWCNT with 20-30 nm in diameter were embedded by drop casting/micro-injector method into the reticulated mesh-like morphology in WO 3 host lattice is exploited for enhanced optical modulation. Enhancement in electrochromic properties in terms of optical modulation (ΔOD), coloration efficiency (CE) and switching times (t b and t c) was studied and reported. © 2011 Elsevier Ltd. All rights reserved.

Nade D.P.,Sanjay Ghodawat Group of Institutions | Shetti D.J.,Smt Kasturbai Walchand College | Sharma A.K.,Shivaji University | Taori A.,National Atmospheric Research Laboratory | And 5 more authors.
Advances in Space Research | Year: 2015

This work about the zonal drift velocity and signature of equatorial plasma bubbles (EPBs) by measurements of global positioning system (GPS) receiver and all sky imager (ASI) operating in India, at the low latitude region. The optical and radio observations have been made from Kolhapur (16.8° N, 74.2° E) and Hyderabad (17.37°N, 78.48°E), respectively. The zonal drift velocity of EPBs has estimated using images of nightglow OI 630.0 nm emission recorded by ASI at Kolhapur. The measurements of total electron content (TEC) using the GPS have carried from the nearby station, Hyderabad. When depletions occurred about 00:37 h (IST) in TEC, the EPBs were found to occur about 5:30 h in optical data of OI 630.0 nm emission. This work focuses on simultaneous measurements of TEC and intensity of OI 630.0 nm emissions for EPBs during nighttime. The occurrence period of EPBs in TEC and OI 630.0 nm has found to be different. To study this difference, the zonal drift velocity of EPBs has established. The averaged eastward velocity of EPBs was found to be 138 m/s. The calculated values of zonal drift velocities are well correlated with that of the empirical model values. This work may be helpful in finding the growth of EPBs over low latitude. © 2015 COSPAR. Published by Elsevier Ltd. All rights reserved.

Kadam P.M.,Smt Kasturbai Walchand College | Tarwal N.L.,Shivaji University | Shinde P.S.,Shivaji University | Mali S.S.,Shivaji University | And 4 more authors.
Journal of Alloys and Compounds | Year: 2011

Surface plasmon resonance (SPR) phenomenon of metal-dielectric composite thin films formed by embedding the noble metal nanoparticles in a dielectric matrix offers a high degree of flexibility and enables many applications such as surface enhanced spectroscopes, numerous biological and chemical sensing fields. A remarkable enhancement in optical modulation after embedding the gold nanoparticles in a reticulated mesh like matrix of WO3 thin films was observed. WO3 films were prepared onto the conducting ITO coated glass substrates by a novel pulsed spray pyrolysis technique (PSPT). A reticulated mesh like morphology of WO3 was achieved by optimizing the deposition parameters of PSPT and the gold nanoparticles were embedded in the WO3 matrix by a drop casting method. Enhancements in electrochromic properties of WO3 in terms of optical modulation (ΔOD), coloration efficiency (η) and response times (tc and tb) were attributed to the assistance of SPR in gold nanoparticles during coloration and electric field induced quenching of SPR during bleaching. © 2010 Elsevier B.V. All rights reserved.

Sawant V.J.,Metal Oxide Research Laboratory | Bamane S.R.,Raja Shripatrao Bhagwantrao College Aundh | Kanase D.G.,Metal Oxide Research Laboratory | Ghosh J.,Smt Kasturbai Walchand College
RSC Advances | Year: 2016

The surface engineering of rutile phase TiO2 nanoparticles was performed by carbogenic carbon dots for biological applications. Carbon dots were synthesized by a green hydrothermal method from the ginger herb and TiO2 nanoparticles were synthesized by co-precipitation of TTIP. The carbon dots were successfully coated over the surface of TiO2 nanoparticles and the hydrophobic multi-therapeutic drug curcumin was wet loaded chemically. These nanostructures were characterized using UV-Vis, PL and FTIR spectroscopy and XRD and TEM analysis. The curcumin loaded C dot coated TiO2 nanoparticles have shown higher anticancer potential than unloaded nanoparticles on MCF-7 breast cancer cells and anti-psoriatic potential on HaCaT keratinocyte skin cells. The enhancement in biocompatibility was observed for curcumin after loading on TiO2 nanoparticles, thus destroying the hydrophobicity after C dot surface engineering. © The Royal Society of Chemistry 2016.

Pinjari R.K.,Smt Kasturbai Walchand College | Aldar B.A.,Smt Kasturbai Walchand College | Burange N.M.,Smt Kasturbai Walchand College | Bhosale C.H.,Shivaji University
Indian Journal of Pure and Applied Physics | Year: 2016

Magnetoelectric (ME) composites of ferrite and ferroelectric phase with y(Ni0.7Co0.2Cd0.1Fe2O4) + (1-y)Ba0.9Sr0.1TiO3 with y=0.15, 0.30 and 0.45, respectively were prepared by standard double sintering ceramic method. The constituent phases, i.e., ferrite and ferroelectric phase presence were confirmed by X-ray diffraction pattern. Scanning electron micrographs were studied to understand microstructure of the prepared samples. The dielectric constant (ϵ) and loss tangent (tanδ) were measured as a function of frequency and also function of temperature at the fixed frequencies 1, 10, 100 kHz and 1 MHz. The AC conductivity was studied to understand conduction mechanism. © Copyright 2015 The Council of Scientific and Industrial Research, New Delhi. All rights reserved.

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