Heat capacity studies of phase transitions in a series of homologous liquid crystals using the AC heat capacity technique
Smaardyk, John Edward
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https://hdl.handle.net/2142/25640
Description
Title
Heat capacity studies of phase transitions in a series of homologous liquid crystals using the AC heat capacity technique
Author(s)
Smaardyk, John Edward
Issue Date
1976
Doctoral Committee Chair(s)
Mochel, J.M.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
heat capacity
phase transitions
homologous liquid crystals
AC heat capacity
Language
en
Abstract
A new calorimeter has been developed for organic liquids which utilizes the AC heat capacity technique. It can measure heat capacity changes of 1 part in 104 with a temperature resolution of 0.3 mK. This calorimeter has been used to study the smectic A-nematic phase transition in a series of homologous liquid crystals. In addition to pure CBOOA, measurements were made on mixtures of CBOOA and the next longer homolog, CBNOA. The character of the transition was found to change from first to second order as the percentage of CBNOA was increased, as predicted by the microscopic theories of Kobayashi and McMillan.
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