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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.44 [2006] >
IJPAP Vol.44(10) [October 2006] >
| 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) |
| Source: | IJPAP Vol.44(10) [October 2006]
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