Government Holkar Science College

Indore, India

Government Holkar Science College

Indore, India
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Shivhare S.,Shri VaishnavSM Institute of Technology and Science | Gautam M.D.,Government Holkar Science College
Journal of Chemical and Pharmaceutical Research | Year: 2011

The synthesis of Cu(II) and Ni(II) complexes with thiosemicarbazone(L) ligand have been reported. The ligand was characterized by elemental analysis and spectral (IR and 1H NMR) studies and its complexes were characterized by electronic, UV/VIS, EPR and IR studies. At room-temperature EPR spectrum of Cu(II) complex was recorded, indicated distorted octahedral structure. The electronic spectrum of Ni(II) complex indicated the octahedral geometry around the Ni(II) ion. Their antibacterial activities were evaluated by the diameter of zone of inhibition (mm) against four bacteria such as B. subtilis, S. aureus, E. coli and K. pneumonia. The ligand and the 6-coordinate Ni(II) complex did not inhibit the growth of the test organisms, while the Cu(II) complex showed good antibacterial activity than parent ligand against the same bacteria.


Shivhare S.,Shri VaishnavSM Institute of Technology and Science | Gautam M.D.,Government Holkar Science College
Journal of Chemical and Pharmaceutical Research | Year: 2011

The synthesis of Cu(II) and Ni(II) complexes with thiosemicarbazone(L) ligand and their characterization have been reported in our previous research paper, J. Chem. Pharm. Res., 2011, 3(5):682-688. By this research work we tried to monitor UV-VIS spectral and structural changes accompanying electron transfer, the electrochemical properties of metal complexes particularly with sulphur donor atoms have been studied. The polarograph measurements were made on the degassed (all solution) was deoxygenated by passing nitrogen into DMF(dimethyl formamide) solution (10-3 M) for 10 minutes prior to the recording of polarograms. Solution (10- 2 M) containing TEAFB (Tetraethyl ammonium fluroborate) was used as the supporting electrolyte. The three-electrode system consisting of drooping mercury (working), platinum wire (counter) and K/KCI (reference electrodes).


Okram G.S.,UGC-DAE Consortium for Scientific Research | Kaurav N.,Government Holkar Science College | Lalla N.P.,UGC-DAE Consortium for Scientific Research
Faraday Discussions | Year: 2015

Nickel nanoparticles (NPs) of different shapes and sizes in polydispersed as well as monodispersed forms were synthesized using trioctylphosphine (TOP), triphenylphosphine (TPP), oleylamine (OA) and their combinations as surfactants to study their self-assembly inducing capabilities. Randomly agglomerated polydispersed NPs were found for TPP and OA, and TPP or OA separately. However, in consolidation with the earlier report of Singh et al., J. Mater. Chem. C, 2014, 2, 8918, NPs formed using TOP only and a combination of TOP with OA naturally exhibited monodispersed NPs associated with natural nanolattice formation without any other external force or surfactants, demonstrating clearly the self-inducing capacity of TOP into monodispersed NPs and their self-assembled nanolattices. Fourier-transformed infra-red (FTIR) data clearly indicated the capping of these surfactants along with acetylacetonate ligands from nickel acetylacetonate precursor on the surface of the NPs. Remarkably, the narrowest zeta potential (ζ) base-widths were observed for samples possessing a self-assembled nanolattice, compared to the broader ones for randomly agglomerated particles. This journal is © The Royal Society of Chemistry 2015.


Kaurav N.,Government Holkar Science College | Lalla N.P.,UGC-DAE Consortium for Scientific Research | Okram G.S.,UGC-DAE Consortium for Scientific Research
Journal of Materials Chemistry C | Year: 2014

This is the first report on the critical nature of nanolattice formability of different particle sizes (∼4-10 nm) of monodispersed nickel nanoparticles. They exhibit strikingly hexagonal close-packed (hcp) nanolattices without extra forces whenever trioctylphosphine (TOP) is one of the surfactant(s). This clearly establishes the unique role of nanolattice formability of TOP. The c/a ratios are interestingly identical to those of atomic lattices. An attempt has also been made to explain them based on the balanced attractive and repulsive forces of the surfactant-generated cation-anion pairs on the surface of the nanoparticles. The present findings therefore will provide a far-reaching vista for the fabrication of varieties of natural nanolattices and their understanding on applications in a new paradigm. This journal is © the Partner Organisations 2014.


Jain A.,Government Holkar Science College | Dixit R.C.,Government Holkar Science College
Journal of Physics: Conference Series | Year: 2017

This paper is dealing with the high pressure behavior of alkali halide (NaH) and a structural phase transition from NaCl to CsCl phase is predicted under high pressure. We have adopted an effective interionic interaction potential, which includes the long range Coulomb, van der Waals (vdW) interaction and the short-range repulsive interaction upto second-neighbor ions within the Hafemeister and Flygare approach. The thermodynamic requirement, for the equality of free energies, at a phase boundary, suggests that the transition pressure of NaH occur at 37 GPa. The transition involves the coordination number increasing from 6 for the NaCl-type structure to 8 for the CsCl-type structure. © Published under licence by IOP Publishing Ltd.


Dubey P.,Government Holkar Science College | Kaurav N.,Government Holkar Science College
Journal of Physics: Conference Series | Year: 2017

Non-stoichiometric nickel oxide was synthesized by the thermal decomposition method at different sintering temperatures upto 1100 °C. The samples were analyzed by thermogravimetric analysis (TGA). Wherein, the stoichiometry of the sample was analyzed by calculating the excess oxygen. It was found that as the sintering temperature of the precursor increases the excess oxygen present in the sample decreases, and at temperature above 700 °C, the sample becomes stoichiometric. These results were interpreted as the decomposition temperature increases, which heals the defects present in the non-stoichiometric nickel oxide. Thus, highly defective nickel oxide at lower decomposition temperature approaches stoichiometric nickel oxide as the temperature is increases above 700 °C. © Published under licence by IOP Publishing Ltd.


Jain P.,Mata Jija Bai Government Girls Post Graduate College | Kumar Jain P.,Government Holkar Science College
Journal of Chemical and Pharmaceutical Research | Year: 2012

Hibiscus rosa sinensis is a species of family Malvaceae. Indicators are very special chemicals, they change colour of the solution with change in Ph by adding acid or alkali. In the present work acid base titration has been performed by using natural indicators. The natural indicator is prepared from the most commonly occurring flower Hibiscus rosa sinensis. Aqueous and methanolic extract of flower were used as natural indicator. Two acids (H2SO4 and CH3COOH) and two bases (KOH and NH4OH) were selected for acid base titration. 1.0N, 0.1N and 0.5N strength of these acids and bases were prepared. The results obtained by the natural indicators are almost similar to the results given by the synthetic indicator. Thus natural indicators from flowers can be used for acid base titration at any dilution. Titration with aqueous extract of natural indicator has not yet been done by any research team. Using aqueous extract of flower as indicator is more economical and with the same accuracy of result as that given by synthetic indicator.


Okram G.S.,UGC-DAE Consortium for Scientific Research | Kaurav N.,Government Holkar Science College
Journal of Applied Physics | Year: 2011

Nanocrystalline copper (NC-Cu) of average particle size (D) ranging from 29 to 55 nm was prepared using the polyol method. The compacted pellets of these nanoparticles were investigated using electrical resistivity (ρn) and thermopower (Sn) measurements in the temperature range from 5 to 300 K. The observed electrical resistivity and thermopower data for all the samples are typical of a good metal and the ρn(T) data are analyzed in the framework of the Bloch-Grüneisen theory. Our analysis indicates systematic departure from the bulk property for NC-Cu samples, decreasing effective Debye temperature, exponential decay of both the residual resistivity ratio (RRR) and the temperature coefficient of resistivity [α = (1/ρ)dρ/dT] as D decreases, yet the Boltzmann theory of electron transport still holds true (kFl ≫ 1). Further, the validity of the Nordheim-Gorter rule is also discussed. The temperature dependence of S n is found to be quite sensitive as compared to bulk thermopower SBulk behavior, revealing the evolution of Sn and exhibiting a significant enhancement of the phonon drag peak as D decreases. The present findings overall suggest the significant influence of the grain boundaries, surface atoms, and phonon confinement. © 2011 American Institute of Physics.


Kaurav N.,Government Holkar Science College
Physica Scripta | Year: 2013

Pressure-induced structural aspects of ZnS-type (B3) to NaCl-type (B1) structure in XC (X = Si, Ge, Sn and Pt) compounds are presented. An effective interionic interaction potential with long-range Coulomb, van der Waals (vdW) interaction and the short-range repulsive interaction up to second-neighbor ions within the Hafemeister and Flygare approach with modified ionic charge is developed. Particular attention is devoted to evaluate the vdW coefficients following the Slater-Kirkwood variational method, as both the ions are polarizable. Our results on vast volume discontinuity in pressure volume phase diagram identify the structural phase transition from B3 to B1 structure. The estimated value of the phase transition pressure (Pt) and the magnitude of the discontinuity in volume at the transition pressure are consistent as compared to the reported data. The variations of elastic constants with pressure follow a systematic trend identical to that observed in other compounds of ZnS and NaCl-type structure family and the Born relative stability criteria are valid in XC compounds. © 2013 The Royal Swedish Academy of Sciences.


Kumar C.S.,Government Holkar Science College
Disaster Advances | Year: 2011

Topographical maps are indispensable tools for geologists, geographers, foresters, civil engineers, military personnel etc. The process of finding the sheet numbers for irregular polygons like district boarders, watershed boundaries etc. is bit tedious and cumbersome. With the launching of websites like Google Earth and ISRO Bhuvan, finding the latitudes and longitudes of the points and areas of interest has become very easy. Further geo-referenced data in popular GIS software formats are also available from other sources. Recently Survey of India has brought out Open Series Maps (OSMs) on WGS-84 Datum, which have slightly different numbering system than that of the Topographical maps on Everest Datum. Keeping this in mind, an interactive computer programme has been developed for quick and accurate calculation of number of both Topographical Maps and OSMs published by Survey of India. The data input and output are compatible with popular GIS file formats like shape and KML.

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