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Sandeep G. Yenchalwar Rami Reddy Devarapalli Ashvini B. Deshmukh Dr. Manjusha V. Shelke 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(24):7402-7409
The visible‐light response of Au nanoparticles (AuNPs) assembled on rGO through different molecular bridges was investigated by transient photocurrent generation. We prepared rGO with two self‐assembled monolayers (SAMs), one linear and the other with aromatic triazoles through a click cycloaddition reaction. A fivefold photocurrent enhancement was observed for triazole linkers over the aminopropyltrimethoxysilane (APTMS) linker. Cyclic voltammetry (CV) and impedance measurements also suggest fast electron transfer on account of the low resistance offered by the click‐modified rGO surface whereby introduction of triazoles offers the efficient bridge between the donor AuNPs and acceptor rGO. 相似文献
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Lokhande A. C. Shinde N. M. Shelke A. Babar P. T. Kim Jin Hyeok 《Journal of Solid State Electrochemistry》2017,21(9):2747-2751
Journal of Solid State Electrochemistry - Green synthesis of optically active silver nanoparticles (Ag) containing thin film on flexible plastic strip substrate has been carried using guava leaf... 相似文献
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In this paper we have analyzed the Kaluza-Klein type Robertson Walker (RW) cosmological models by considering three different
forms of variable Λ:
,
and Λ∼ρ. It is found that, the connecting free parameters of the models with cosmic matter and vacuum energy density parameters are
equivalent, in the context of higher dimensional space time. The expression for the look back time, luminosity distance and
angular diameter distance are also derived. This work has thus generalized to higher dimensions the well-known results in
four dimensional space time. It is found that there may be significant difference in principle at least, from the analogous
situation in four dimensional space time. 相似文献
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Recently, by proposing a new variant of Random Sequential Adsorption (RSA) namely Random Sequential Ballistic Adsorption (RSBA) model [Pradip B. Shelke, A.G. Banpurkar, S.B. Ogale, A.V. Limaye, Surf. Sci. 601 (2007) 274], we addressed the issue of adsorption dynamics of extended objects where the objects, upon adsorption, protrude outside the substrate. This study brought out the role of the arriving trajectory in the adsorption dynamics. In the present work the possible role of the orientational distribution of the arriving objects in the RSBA dynamics is investigated. The dynamics of RSBA of needles (line segments) is studied analytically and by computer simulation for different types of θ distributions of arriving needles, θ being the angle made by the arriving needle with normal to the substrate. Three types of θ distributions, namely a uniform distribution over the range (0, π/2), a Gaussian distribution and a distribution uniform over the solid angle, are considered. Analytical treatment establishes that in all the three cases, the number n(t) of adsorbed objects at a late time t follows a power law n(t) ∼ tα, and the exponent α depends on the specifics of the θ distribution. In general, for distribution f(θ) ∝ θβ, for θ → 0, α is found to be 2/(β + 3). The simulation results are in excellent agreement with the analytical findings and together they reveal that the orientational distribution of arriving objects has significant consequences for the Random Sequential Ballistic Adsorption (RSBA) process. 相似文献
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Ceric Ammonium Nitrate as the Novel Oxidizing Agent for the Facile Synthesis of (Dichloroiodo)arenes
Ceric ammonium nitrate (CAN) has been found to be a remarkable oxidizing agent for the oxidative conversion of iodoarenes to (dichloroiodo)arenes in acetic acid using aqueous HCl. The reaction of CAN with HCl generates in situ molecular chlorine, which is responsible for the oxidation. This method avoids the use of hazardous, toxic, and corrosive gaseous chlorine. 相似文献
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Sanjay A. Jadhav Shashikant B. Landge Samadhan S. Shelke Navanath C. Niphade Raghavendra K. Panchangam Vijayavitthal T. Mathad Saroj R. Bembalkar 《Chromatographia》2010,71(11-12):1055-1061
A rapid and sensitive gas chromatographic method using flame ionization detection (GC–FID) has been developed and validated for five process related non-chromophoric impurities viz, 2-(2-chloroethoxy)ethanol (2-CEE), piperazine, 2-(piperazin-1-yl)ethanol (HEP), 2-[2-(piperazin-1-yl)ethoxy]ethanol (HEEP), 2,2-[piperazine-1,4-diylbis(ethane-2,1-diyloxy)]diethanol (DEEP) observed during the process development of quetiapine hemifumarate, an antipsychotic drug is presented. All five non-chromophoric impurities ranging from 0.05 to 0.1% were detected using DB-5 (30 m × 0.53 mm, 5 μm) column with a good peak separation. The method was fully validated according to the ICH Q2 (R1) guidelines. The investigated validation protocols showed that the method has acceptable specificity, accuracy, linearity, precision, robustness and high sensitivity with detection limits and quantitation limits ranging from 0.001 to 0.01% and 0.004 to 0.03%, respectively. These non-chromophoric impurities generated during the process were identified by GC–MS and are characterized by MS, 1H NMR and FT-IR spectroscopy. 相似文献
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Vilas Shelke Subhash Khatarkar Rashmi Yadav Avneesh Anshul R.K. Singh 《Journal of magnetism and magnetic materials》2010,322(9-12):1224-1227
The divalent substitutions in rare-earth manganites create quenched disorders; those are responsible for the modification of magnetoelectronic properties through competition of two phases. In this regards, the substitution of divalent Hg is rarely studied. Here, we present the results on effect of Hg2+ substitution in LCMO manganites. We have synthesized polycrystalline samples with nominal compositions La0.7Ca0.3?xHgxMnO3 (0?x?0.2) by the standard solid-state reaction method. The X-ray diffraction data revealed monophasic nature without a signature of Hg related or any other impurity phase. The ac susceptibility measurement showed variation in the magnetic transition temperature as well as the transition width. The electrical resistivity measurement showed variation in metal-insulator transition temperature. The magnetoresistance (MR) measurements were carried out at 5 T magnetic field. The samples show varying magnitude of magnetoresistance as high as 74.48%. The distinct feature seen with Hg substitution is the increase in the magnitude of MR and temperature range over which MR value is sustained. It also improves the microstructure of the samples. 相似文献
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Suryakant B. Sapkal Kiran F. Shelke Bapurao B. Shingate Murlidhar S. Shingare 《中国化学快报》2010,21(12):1439-1442
<正>l-Methyl-3-ethyl imidazolium bromide[meim]Br/basic alumina(Al_2O_3) has been found to promote the cyclocondensation of chloroacetone/chloroethyl acetate with salicylaldehydes under conventional as well as microwave irradiation to yield benzofuran derivatives. 相似文献