Anomalous behaviours of the heat capacity in a liquid crystal showing a re-entrant isotropic phase

作者：Ema K^*; Yao H; Takanishi Y; Takezoe H; Kusumoto T; Hiyama T; Yoshizawa A

来源：Liquid Crystals, 2002, 29(2): 221-225.

DOI：10.1080/02678290110099448

High resolution a. c. calorimetric measurements have been carried out on a liquid crystal 2-{4-[(R)-2-fluorohexyloxy]phenyl}-5-{4-[(S)-2-fluoro-2-methyldecanoyloxy]phenyl}pyrimidine (RSFPPY), determined the present measurement revealed precise temperature dependence of the heat capacity over a wide temperature range including the phase transition temperatures. The isotropic-chiral smectic C transition was anomalous in that it showed quite different behaviours depending on whether the measurement was made on heating or cooling; that is attributed to the relaxational character of the transition. A new non-transitional feature in the isotropic phase was found, corresponding to a very broad heat capacity peak over a 30 K temperature range. This indicates an existence of a new phase, possibly some kind of blue phase, at the lower temperature side of the isotropic phase.

• 出版日期2002-2