Thermochromic coefficient

Ghosh [38,86] has calculated the thermochromic shift of PANI and POT at different temperatures. The exciton peak of PANI was found to show a blue shift almost linearly with increasing temperature in the range 25-55° C. The coefficient of the shift was calculated to be 6.2 cm K for DMF and 11.9 cm K"" for... 

The use of thermochromic liquid crystals in qualitative studies of heat transfer is relatively common [44—48] hot and cold regions are discriminated, but precise temperatures are not necessarily deduced from the results. Quantitative measurements were first made by Cooper et al. [49, 50], who evaluated the variation of the Nusselt number around a heated cylinder in cross-flow (the Nusselt number of a body, Nu=hl/KQ, where h is heat loss per unit area, / is a typical dimension, 0 the temperature difference between the body and surroundings and K is the thermal conductivity). Local heat transfer coefficients for plates in air jets have also been measured [51] and the temperature shift of the colour band due to the shearing action of the air flow determined [52] this is particularly important in making quantitative measurements from ex-... 

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