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SYNTHESIS,CHARACTERIZATION AND ENHANCED ELECTRICAL PROPERTIES OF CTAB-DIRECTED POLYANILINE NANOPARTICLES

Chinese Journal of Polymer Science 2011年第2期29卷 181-190页

作者： lal said jan Mohamed Ahmed Siddig Department of Physics Postgraduate College Mardan23200Khyber PakhtunkhwaPakistan School of Physics and Applied Physics Faculty of Science and TechnologyEL Neelain UniversityKhartoumSudan

Inverse microemulsion system of cetyltrimethylammonium bromide（CTAB） molecules is utilized for virtually monodispersed and controlled growth of HCl polyaniline（PANI） nanoparticles at room temperature（ca.300 K）.The templated electroconductive polymer reveals lamellar crystalline structure under X-ray diffraction signifying marked sub-chain alignment of the polymerized *** nanostructured polymer has spherically symmetric morphology in a size range of 2.0 nm to 6.0 nm under electron microscope *** permeation chromatography gives polydispersity index of 1.02 for nanostructured polymer in agreement with the size monodispersity transpired by electron *** *** conductivityσ_（dc） of PANI at room temperature is 10.11 S/cm whereas the variation of conductivity with temperature in the range 227-303 *** that the conducting mechanism can be considered as three-dimensional variable-range-hopping（3D-VRH）.UV-Vis spectrum indicates two broad absorption bands due to polaron formation that contributes to enhanced electrical conductivity of the *** fundamental absorption edge in the polymer is formed by direct allowed transitions to the extent that the optical band gap value was found to be 2.35 *** crystalline nanostructure and homogeneous doping attained in the cationic template of amphiphile are argued as contributing factors to the enhanced conductivity of the polymer.

关键词： Polyaniline Nanostructured Band gap energy Electrical conductivity

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Assessment of Road Dust Contamination in India

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Atmospheric and Climate Sciences 2016年第1期6卷 77-88页

作者： Dhananjay Sahu Shobhana Ramteke Nohar Singh Dahariya Bharat lal Sahu Khageshwar Singh Patel Laurent Matini Jose Nicolas Eduardo Yubero jan Hoinkis JK Laxmi Cement Ahiwara Durg CG India School of Studies in Chemistry/Environmental Science Pt. Ravishankar Shukla University Raipur India Department of Exact Sciences E.N.S. Marien Ngouabi University Brazzaville Congo Atmospheric Pollution Laboratory Applied Physics Department Miguel Hernandez University Elche Spain Karlsruhe University of Applied Sciences Karlsruhe Germany

The road dusts (RD) are fugitive in nature causing potential health hazards to people living in highways. They are generated from different sources on the roads and being a valuable archive of environmental information. In the present work, contamination assessment of 18 heavy metals and ions in road dusts of the country are described. Techniques i.e. ion selective, ion chromatography and atomic absorption spectrophotometers were used for analysis of the ions and metals. The content of F-, Cl-, , , , Na+, K+, Mg2+, Ca2+, As, Cr, Mn, Fe, Ni, Cu, Zn, Pb and Hg in the road dusts was ranged from 75 - 895, 276 - 12718, 48 - 1423, 243 - 10,580, 11 - 539, 290 - 46,484, 110 - 7716, 84 - 1771, 595 - 15,955, 24 - 42, 164 - 526, 1711 - 5218, 63,850 - 144,835, 47 - 62, 81 - 720, 166 - 450, 92 - 295 and 0.05 - 0.12 mg/kg with mean value of 224 ± 43, 3734 ± 895, 592 ± 895, 2859 ± 662, 143 ± 29, 4826 ± 2049, 1565 ± 411, 837 ± 121, 8545 ± 1288, 31 ± 4, 246 ± 82, 3002 ± 851, 91,331 ± 18,587, 54 ± 4, 206 ± 145, 241 ± 64, 171 ± 42 and 0.08 ± 0.02 mg/kg, respectively (at 95% probability). The enrichment, variation, correlation and sources of the contaminants are discussed.

关键词： Ions Heavy Metals Sources Road Dust

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Contamination of Water, Dust, Soil, Rock and Urine with Fluoride in Central India

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Journal of Environmental Protection 2015年第12期6卷 1347-1359页

作者： Khageshwar Singh Patel Dhananjay Sahu Nohar Singh Dahariya Bharat lal Sahu Shobhana Ramteke Borislav Blazhev Laurent Matini Eduardo Yubero jan Hoinkis School of Studies in Chemistry/Environmental Science Pt. Ravishankar Shukla University Raipur India Central Laboratory for Chemical Testing and Control Sofia Bulgaria Department of Exact Sciences Marien Ngouabi University Brazzaville Congo Applied Physics Department Miguel Hernandez University Elche Spain Karlsruhe University of Applied Sciences Karlsruhe Germany

At least 15% of 0.1 million people residing in 117 villages of Tamnar block (Chhattisgarh, central India) are suffering from fluorosis diseases. In this work, the contamination of F- in the environment (i.e. water, soil, rock and urine) of the Tamnar block is described. The concentration variations of F-, Cl-, NO3-, SO42-, Na+, K+, Mg2+, Ca2+, Al, Mn, Fe and Zn in the groundwater are reported. The F- content in the water was ranged from 1.7 - 17 mg/L with mean value of 9.0 ± 3.7 mg/L. Fluoride was enriched up to 3-, 54-, 69- and 244-folds in the urine, soil, dust and rock, respectively. The cluster and factor analysis models were used to apportion sources of F- and other elements in the water.

关键词： Fluoride Contamination Groundwater Soil Rock India

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