Investigation of the Smectic-A–Smectic-C* Transition in Liquid Crystals by Adiabatic Scanning Calorimetry

Autor:	Jan Thoen, Guido Pitsi, B. Van Roie, Katleen Denolf
Rok vydání:	2006
Předmět:	Phase transition Materials science Differential scanning calorimetry Liquid crystal Latent heat Resolution (electron density) Analytical chemistry General Materials Science General Chemistry Calorimetry Condensed Matter Physics Adiabatic process Ferroelectricity
Zdroj:	Molecular Crystals and Liquid Crystals. 449:47-55
ISSN:	1563-5287 1542-1406
DOI:	10.1080/15421400600580204
Popis:	We performed Adiabatic Scanning Calorimetry (ASC) measurements on two ferroelectric liquid crystals: S-(-)-4-(2′ -methylbutyloxy)phenyl 4-n-octyloxybenzoate and S-(-)-2-methylbutyl 4-n-nonanoyloxybiphenyl-4′-carboxylate. Our experiments showed that no latent heat was present for the smectic-A – smectic-C* (AC*) transition to within the experimental resolution. Therefore the AC* transition in both samples can be classified as a continuous one. By fitting the specific heat data we showed that this phase transition can be described by an extended mean-field model.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::edb2a3036e11f0fc6995808c82a40a30 https://doi.org/10.1080/15421400600580204 Zobrazit plný text záznamu