Influence of thermal and optical properties on the visibility of liquid-crystal phase transitions in photoacoustic spectroscopy

Germain Puccetti; Roger M. Leblanc

doi:10.1063/1.476143

Influence of thermal and optical properties on the visibility of liquid-crystal phase transitions in photoacoustic spectroscopy

Germain Puccetti, Roger M. Leblanc

Chemistry

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

The thermal, optical light absorption and light scattering properties of a liquid crystal can be distinguished and separately studied by a single technique, pulsed photoacoustic spectroscopy (PPAS), by using different excitation/detection configurations. The advantages of performing complementary thermal and optical measurements without modifying the sample environment are demonstrated in the case of a typical liquid crystal: 4-octyl-4′-cyanobiphenyl (8CB). Results show that light scattering can strongly influence the PPAS response signal through the light absorption profile, especially at phase transitions subjected to small changes in thermal properties, such as the Nematic/isotrope phase transition.

Original language	English (US)
Pages (from-to)	7258-7265
Number of pages	8
Journal	Journal of Chemical Physics
Volume	108
Issue number	17
DOIs	https://doi.org/10.1063/1.476143
State	Published - May 1 1998

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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abstract = "The thermal, optical light absorption and light scattering properties of a liquid crystal can be distinguished and separately studied by a single technique, pulsed photoacoustic spectroscopy (PPAS), by using different excitation/detection configurations. The advantages of performing complementary thermal and optical measurements without modifying the sample environment are demonstrated in the case of a typical liquid crystal: 4-octyl-4′-cyanobiphenyl (8CB). Results show that light scattering can strongly influence the PPAS response signal through the light absorption profile, especially at phase transitions subjected to small changes in thermal properties, such as the Nematic/isotrope phase transition.",

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