Determination of phase transitions in liquid crystals by optical absorption spectroscopy

Cristian Sarpe-Tudoran; Margareta Socaciu; Marcela Ursache; Johny Neamtu; G. Bratulescu; S. Radu

doi:10.1117/12.312817

2 July 1998 Determination of phase transitions in liquid crystals by optical absorption spectroscopy

Cristian Sarpe-Tudoran, Margareta Socaciu, Marcela Ursache, Johny Neamtu, G. Bratulescu, S. Radu

Proceedings Volume 3405, ROMOPTO '97: Fifth Conference on Optics; (1998) https://doi.org/10.1117/12.312817
Event: ROMOPTO '97: Fifth Conference on Optics, 1997, Bucharest, Romania

Abstract

Some interesting experimental results involving new synthesized liquid crystals, derivatives of 4,4'-dihidroxyazobenzene and 4,4'-dihidroxy-azoxybenzene inferred by means of optical absorption spectroscopy are exposed. The absorption spectra dependence on the sample temperature in both heating and cooling processes is investigated. At the same time, the optical density is recorded at a fixed wavelength and it presents significant variations at phase transition temperatures. These data complete the results correlated with mesomorphism, obtained by classical techniques (DTA and microstructural analysis in polarized light).

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Cristian Sarpe-Tudoran, Margareta Socaciu, Marcela Ursache, Johny Neamtu, G. Bratulescu, and S. Radu "Determination of phase transitions in liquid crystals by optical absorption spectroscopy", Proc. SPIE 3405, ROMOPTO '97: Fifth Conference on Optics, (2 July 1998); https://doi.org/10.1117/12.312817

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