INTERNATIONAL JOURNAL OF CHEMICAL AND PHYSICAL SCIENCES

1-11

Authors: SRIVASTAVA K.P., SINGH INDU AND KUMARI ANUPMA

A microwave-promoted new easy, efficient, clean and environmentally benign method for the synthesis of 1,7- naphthyridineand its derivatives from 2-cyano-3- pyridylacetonitrile has been developed. The desired products were isolated in excellent yields and high purity under eco-friendly conditions. The synthesized compounds were characterized by the IR, UV-Visible and 1H NMR spectral analyses along with elemental analysis.

22-28

Authors: SHARAD TRIPATHI,, S K DUBEY, V. S. UPADHYAY

In this study, un-doped GaAs were uniformly implanted with 325 keV Mn+ ions for the various fluences varying from 1x 1015 to 2 x 1016 ions cm-2 using 1.7 MV Tandetron accelerator at IGCAR, Kalpakkam. RBS technique was used for their characterization and was found to decrease in scattering yield between the channel numbers 650 to 750 with falling edge showed reduction in the volume concentration of the GaAs due to the presence of implanted manganese ions in the region. UV-VIS-NIR spectra of nonimplanted and samples implanted for various fluences ranging from 1 x 1015 to 2 x 1016 ions cm-2 were performed in the spectral region 150 nm to 3300 nm. The values of the absorption coefficient of Mn+ ion implanted GaAs samples estimated from the transmission spectra were found to increase with ion fluence. The increase in absorbance with respect to ion fluence indicates the increase in defects and disorder in the ion implanted layers. The band gap energy of the samples implanted with the fluence of 1 x 1015, 5 x 1015, 1 x 1016 and 2 x 1016 ions cm-2 estimated from the 2 versus photon energy curve were found to be 1.370, 1.332, 1.323 and 1.309 eV respectively.

43-48

Authors: VIJAY SHANKAR UPADHYAY*, S. K. DUBEY, ARVIND SINGH, SHARAD TRIPATHI

The addition of inorganic nanoparticles to polymers allows the modification of the polymer physical properties as well as the implementation of new features in the polymer matrix. Thin films of pure Poly Vinyl Alcohol (PVA) and PVA mixed with 4 %, 8 % & 12 % by weight of Fe2O3 nanoparticles (NP) were prepared by spin coating technique. The average size of Fe2O3 nanoparticles were 30nm – 40 nm. Structural, Optical and Morphological properties of the prepared nanocomposite films were studied by using Fourier Transform Infra Red Spectrophotometer,(FTIR) Ultra Violet Visible Spectrophotometer (UV-Vis) and Atomic Force Microscopy (AFM). The peaks in FTIR spectra of the prepared films show interaction between PVA and NP. Film of PVA with 8% concentration of NP was found to be better than other prepared samples. There is a decrease in optical band gap of prepared films with increase in concentration of NP. Morphological studies using AFM shows uniform grain structures of pure PVA and change in surface morphology with addition of NP. RMS roughness of PVA decreases with addition of 4 % and 8 % concentration of NP which could be due to more nucleation sites produced by NP. However RMS roughness of PVA increases for 12 % concentration of NP as compared to pure PVA. This could be due to agglomeration of NP.

54-62

Authors: N. MANJULA, A.R. BALU*

Highly transparent and conducting cadmium oxide thin films were deposited on glass substrates by a simplified spray technique using perfume atomizer. The films were prepared with different molar concentrations of cadmium acetate. The effect of molar concentration on the structural, morphological, optical and electrical properties was studied. XRD analysis showed that the films exhibit cubic crystal structure with (1 1 1) preferred orientation. With higher solution concentration, the orientation changes to (2 0 0) plane. A slight angle shift of 0.03º to 0.22º for the (1 1 1) peak and a shift of 0.003º to 0.015º for the (2 0 0) peak was observed in the films as the molar concentration changes from 0.025M – 0.1M. The film surface modifies, with grains taking different forms with increased molar concentration.

69-79

Authors: ASHOK KUMAR DASH, RITA PAIKARAY

The ultrasonic velocity (U),density (ρ) and coefficient of viscosity(η) of the ternary mixture of mixture of dimethyl acetamide in acetone and isobutyl methyl ketone at frequencies 2MHZ, 4MHZ, 6MHZ AND 8MHZ have been measured at temperature 308K. Adiabatic compressibility (Ks), intermolecular free length (Lf), free volume (Vf), internal pressure (πi) and their respective excess values have been computed for entire range of mole fraction and are interpreted to explain molecular interaction occurring in the liquid mixture. Relaxation time (τ), excess enthalpy (HE) and absorption coefficient (α/f2) have been calculated and discussed. The negative excess values of coefficient of viscosity ηE indicate the presence dispersion, induction and dipolar forces in ternary liquid mixture.the negative values of excess adiabatic compressibility Ks E, excess free length Lf E, excess free volume Vf E and excess enthalpy HE and the positive values of excess internal pressure πi E indicate the presence of specific interactions in the ternary liquid mixture.