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Smectic A-Nematic and Nematic-Isotropic Liquid Transitions in 8CB Liquid Crystal: Comparative Analysis |
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| Authors: | J. Font J. Muntasell J. Li. Tamarit E. Rojas |
| Affiliation: | 1. Departament de Fisica , E.T.S.E.I.B. Universitat Politècnica de Catalunya , Diagonal 647, 08028, Barcelona, Spain;2. Departament de Termologia , Facultat de Fisica, Universitat de Barcelona , Diagonal 645, 08028, Barcelona, Spain |
| Abstract: | A differential heat flux calorimeter has been used to study the Smectic A-Nematic and Nematic-Isotropic Liquid transitions in 8CB liquid crystal. The Faktor and Hanks model under our working conditions enables us to distinguish first-order from second-order transitions by analysis of differential signal. The critical exponent values obtained justify the proportionality between Cp evolution and the normalized differential signal (differential signal divided by the scanning rate). |
| Keywords: | liquid crystals thermal analysis mesophases heat capacity pretransitional effects critical exponents |