The general theory of photoacoustic signals is adapted to the detection of liquid crystals' thermal parameters. The thermal-diffusion length to optical-absorption length ratio is given as a simple function of the phase, while the sample to gas effusivity ratio is given as a simple function of phase and normalized amplitude. A method allowing the determination of each thermal parameter separately is presented. Since it does not require strong thermal gradients in the sample, it is particularly well suited to the study of pretransitional effects in liquid crystals.
Photoacoustic Analysis of Liquid-crystals Thermal Parameters / M., Marinelli; U., Zammit; F., Scudieri; S., Martellucci; J., Quartieri; Bloisi, Francesco; Vicari, LUCIANO ROSARIO MARIA. - In: NUOVO CIMENTO DELLA SOCIETÀ ITALIANA DI FISICA. D CONDENSED MATTER, ATOMIC, MOLECULAR AND CHEMICAL PHYSICS, BIOPHYSICS. - ISSN 0392-6737. - STAMPA. - 9:(1987), pp. 557-568. [10.1007/BF02667949]
Photoacoustic Analysis of Liquid-crystals Thermal Parameters
BLOISI, FRANCESCO;VICARI, LUCIANO ROSARIO MARIA
1987
Abstract
The general theory of photoacoustic signals is adapted to the detection of liquid crystals' thermal parameters. The thermal-diffusion length to optical-absorption length ratio is given as a simple function of the phase, while the sample to gas effusivity ratio is given as a simple function of phase and normalized amplitude. A method allowing the determination of each thermal parameter separately is presented. Since it does not require strong thermal gradients in the sample, it is particularly well suited to the study of pretransitional effects in liquid crystals.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
