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Title: Measurement of thermal transport and optical properties of conducting polyaniline
Authors: Joshi, G P
Saxena, N S
Sharma, T P
Mishra, S C K
Keywords: Polyaniline;Effective thermal conductivity;Effective thermal diffusivity;Transient plane source technique
Issue Date: Oct-2006
Publisher: CSIR
IPC Code: G01N25/18
Abstract: Measurements of effective thermal conductivity (λe) and effective thermal diffusivity (e) of twin pellets of conducting polyaniline, prepared under a load of 5 ton were carried out from room temperature to 170°C at normal pressure using transient plane source (TPS) technique. The values of λe and e by the use of an empirical relation at various fixed temperature in the above mentioned range have been calculated. The calculated values are in good agreement with the experimental results over the entire range of temperatures of investigation. Besides, the optical band gap of the sample is determined using reflection spectra in the wavelength region 300-800 nm. From the analysis of reflection spectra, polyaniline is found to have energy band gap 3.1 eV. The results indicate that band gap values are dependent on annealing temperatures of the samples and λe and e vary with annealing temperature in the range from room temperature to 170°C. The effective thermal conductivity and effective thermal diffusivity are maximum at about 100°C, whereas the optical band gap is minimum for the sample annealed at 100°C as compared to other annealing temperatures.
Page(s): 786-790
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.44(10) [October 2006]

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