Journal Title
Title of Journal: Int J Thermophys
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Abbravation: International Journal of Thermophysics
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Authors: Abhimanyu Sharma Rohtash Kumar K Asokan Kamla Rawat D Kanjilal
Publish Date: 2016/11/07
Volume: 38, Issue: 1, Pages: 6-
Abstract
We report variation in the dielectric relaxation profiles of an important class of commercially available Cloisite mathrmTM organoclays 25A 15A 30B and 10A which are extensively used as rheology modifiers A systematic and comprehensive comparison is made of their dielectric permittivity upvarepsilon prime and loss upvarepsilon prime prime conductivity upsigma prime and loss tangent tan delta parameters as function of temperature The dispersion profiles showed relatively higher values for upvarepsilon prime upvarepsilon prime prime upsigma prime and tan delta for the CloisitemathrmTM30B samples in lowfrequency region A clear temperaturedependent transition in the values of upvarepsilon prime and upvarepsilon prime prime was noticed for CloisitemathrmTM25A sample at 436 K which was independent of frequency omega The values of upvarepsilon prime and upvarepsilon prime prime showed 1/omega dependence with temperature CloisitemathrmTM30B sample showed a marked decrease in the value of tan delta with increase in temperature compared to other samples Thus it was concluded that these clays bear signature dielectric properties regardless of the fact that they all belong to the same structural class of clays Considering the largescale use of these clays in many industrial products the abovementioned results are of significant importanceThe authors acknowledge University Grants Commission and Department of Science and Technology Government of India for a research fellowship Authors acknowledge Dr P Kumar of Inter University Accelerator Centre New Delhi and are thankful to Mr I Singh of Special Centre for Nanosciences and Advanced Research Instrumentation Facility of Jawaharlal Nehru University New Delhi This work was supported by the Department of Science and Technology DST India KR is very thankful to Department of Science and Technology Government of India—Inspire Faculty Award
Keywords:
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