Varshney, Swati and Ohlan, Anil and Jain, Vinod Kumar and Dutta, Ved Prakash and Dhawan, Sundeep K. (2014) In Situ Synthesis of Polypyrrole-gamma-Fe2O3-Fly Ash Nanocomposites for Protection against EMI Pollution. Industrial and engineering chemistry research, 53 (37). 14282-14290. ISSN 0888-5885

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Abstract

The present paper reports utilization of an industrial byproduct fly ash for potential application by designing nanostick shaped polypyrrole composites decorated with gamma-Fe2O3 and fly ash particles via in situ emulsion polymerization. The structural, magnetic, and electromagnetic shielding properties of the composites with varying loading of gamma-Fe2O3 and fly ash particles have been investigated. The result indicates that these properties can be optimized by modulating the concentration of the constituents in a polymer matrix. Polypyrrole-gamma-Fe2O3-fly ash nanocomposites have a superparamagnetic nature with an M-s value of 1335 emu/g, electrical conductivity of the order of 10(-2) S/cm, and a maximum SE due to absorption (SEA(max)) being ca. 17.4 dB. The overall shielding effectiveness (SE = SEA + SER) up to 25.5 dB (similar to 99.7% attenuation) has been recorded for polypyrrole nanocomposites having pyrrole, gamma-Fe2O3, and fly ash in a 1:1:0.5 wt. ratio in the frequency range of 12.4-18 GHz (Ku-band).

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/S American Chemical Society.
Subjects:	Engineering
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	13 Oct 2015 10:33
Last Modified:	13 Oct 2015 10:33
URI:	http://npl.csircentral.net/id/eprint/1343

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