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Structural and electrical properties of new core-shell silver poly(m-toluidine-co-2-bromoaniline) nanocomposites

Abstract

In this article, we report the synthesis and characterization of silver dispersed poly(m-toluidine-co-2-bromoaniline) copolymer synthesized by chemical oxidative polymerization method. The synthesized copolymer composites were subjected to different analytical characterization methods, such as FT-IR, UV, XRD, SEM, photoluminescence and electrical conductivity studies. All the polymer samples are found to be soluble in common organic solvents. UV absorption spectra show a red shift when silver nanoparticles are dispersed in the copolymer. The characteristic peaks observed in FT-IR spectra confirm the formation of the copolymer. XRD pattern reveals the crystalline nature of the copolymer composites and sharp peaks in the spectra confirm the presence of silver particles. The silver nanoparticles change the surface morphology in the form of perfect encapsulation. The electrical conductivity of the polymer composites is found to vary from 10−4 S/cm to 10−6 S/cm. PL study reveals the charge transfer between the copolymer and the silver particles.

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Intercept-Reactant Method for the Determination of Aromatic Amines in Mainstream Tobacco Smoke

Abstract

A method for the determination of aromatic amines in mainstream smoke of mechanically smoked cigarettes has been developed. The fast reaction of aromatic amines with other smoke constituents formed during the combustion process can be significantly reduced by the addition of an excess of p-toluidine to the acidic collecting solution. From this point the p-toluidine as intercept reactant immediately stabilizes the originally formed amines and results in high recovery rates. The method allows the gas chromatographic determination of aniline, o- and m-toluidine, 1- and 2-aminonaphthalene, 2- and 4-aminobiphenyl, 1-, 2- and 4-aminofluorene, 3-aminofluoranthene, 1-aminopyrene and 6-aminochrysene in the mainstream smoke of a single cigarette. d5-Aniline, d7-2-aminonaphthalene, d9-4-aminobiphenyl as well as fluoranthene and chrysene were used as internal standards. By this new method, 21 ng of 2-aminonaphthalene and about 3,6 ng of 4-aminobiphenyl have been detected in the mainstream smoke of a common blend filter cigarette. As expected, these contents were higher in cigarettes manufactured from alkaline tobacco.

Open access
Trace Analysis of Mutagenic Heterocyclic Aromatic Amines in Cigarette Smoke Condensate and its Base Fractions via Silylation-GC-MS

(accessed 19 th March 2013). 5. Poindexter, E.H. and R.D. Carpenter: The Isolation of Harman and Norharman from Tobacco and Cigarette Smoke; Phytochemistry 1 (1962) 215–212. 6. Hada, N., Y. Totsuka, T. Enya, K. Tsurumaki, M. Nakazawa, N. Kawahara, Y. Murakami, Y. Yoko-yama, T. Sugimura, and K. Wakabayashi: Structures of Mutagens Produced by the Co-Mutagen Norharman with o - and m -Toluidine Isomers; Mutat. Res. 493 (2001) 115-126. 7. Levitt, R.C., C. Legraverend, D.W. Nebert, and O. Pelkonen

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