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Meerut, India

Sharma N.,Nas College | Sharma L.K.,Indian Central Glass and Ceramic Research Institute | Kaur H.,Nas College
Asian Journal of Chemistry | Year: 2012

Crystalline glazes give amazing and spectacular results in ceramic. Their actual chemical makeup is remarkably simple. Two parts frit, one part zinc and one part silica are the constituents needed to make it to workable base glaze. Variations in proportions or addition of other oxides affect the crystal size, shape, colour and number. In this paper we have added 1, 3 and 5 wt % of calcium oxide to basic willemite crystal forming glaze. The samples were examined by scanning electron microscopy for morphological changes and energy dispersive X-ray spectrometer (EDAX-link ISIS 300) attached to SEM was used for chemical analysis. Source


Khasa A.,Nas College | Sharma R.G.,Nas College | Rai A.,Jodhpur National University
Asian Journal of Chemistry | Year: 2011

Four Schiff base metal complexes of Cu(II), Ni(II), Co(II) have been synthesized from a new tetradentate ligand, 2-((E)-1,5-dimethyl-2-phenyl-3-((E)- quinolin-8-methyl)-2,3-dihydro-1 H-pyrazol-4-ylimino)methyl)phenol. The ligand and its metal complexes have been characterized on the basis of elemental analysis, electronic, infrared, 1H NMR and 13C NMR spectral studies. On the basis of electronic spectral studies, for Cu(II) complex, deformed tetrahedral, Co(II) complex, tetrahedral and Ni(II) complex octahedral geometry has been proposed. The in vitro antimicrobial activity of the investigated compounds was tested against the bacteria such as Staphylococcus aureus, Escherichia coli, Klebsiella pneumoniae and fungi-Candida albicans and Rhizopus stolonifer. The data indicate that most of the metal complexes have higher antimicrobial activity than the free ligand. Source


Sharma I.D.,Nas College | Sharma I.D.,National Physical Laboratory India | Sood K.N.,National Physical Laboratory India | Sharma S.K.,Nas College
International Journal of Applied Engineering Research | Year: 2014

Polyaniline (PANI)/dodecylbenzenesulfonic acid (DBSA) salt was synthesized by chemical oxidative polymerization reaction and its structural attributes, surface morphology, thermal stability, and electric properties were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and DC electrical conductivity measurements. The results revealed the variation in surface morphology, thermal stability and microstructure properties is the reason for molecular ordering and electrical conductivity in these polymers. © Research India Publications. Source


Naseema K.,Mangalore University | Shyma M.,Nas College | Manjunatha K.B.,National Institute of Technology Karnataka | Muralidharan A.,Nas College | And 2 more authors.
Optics and Laser Technology | Year: 2011

The molecular charge complex urea picrate (UP) was synthesized and its third order nonlinear optical properties have been investigated using a single beam Z-scan technique with nanosecond laser pulses at 532 nm. Open aperture data of the compound indicates two photon absorption at this wavelength. The nonlinear refractive index n2, nonlinear absorption coefficient β, magnitude of effective third order susceptibility χ(3), the second order hyperpolarizability γh and the coupling factor ρ have been estimated. The experimentally determined values of β, n2, Re χ(3) and Im χ(3), γh and ρ of the compound UP are 2.146 cm/GW, -1.258×10-11 esu, -1.347×10-13 esu, 0.377×10-13 esu, 0.69×10-32 esu and 0.28, respectively. The compound exhibits good optical limiting at 532 nm with the limiting threshold of 80 μJ/pulse. Our studies suggest that compound UP is a potential candidate for optical device applications such as optical limiters. © 2011 Elsevier Ltd. All rights reserved. Source

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