1D10 光学的に等方なヒドラジン系キュービック液晶の圧力下の相転移(2004年日本液晶学会討論会)

概要

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Phase transitions of optically isotropic, thermotropic cubic mesogens, 1, 2-bis-(4-n-alkoxybenzoyl) hydrazine, BABH(n) (n=8, 10, 11, 12), were investigated under hydrostatic pressures up to 200 MPa using high-pressure DTA, wide-angle X-ray diffraction equipped with a high-pressure cell, and polarizing optical microscope equipped with a high-pressure optical cell. In the T vs. P phase diagrams for BABH(8) and BABH(10), the Cub-SmC transition lines have negative slopes (dT/dP) and the Cub phases disappear at very low pressures of about 32 and 11 MPa, respectively. Clausius-Clapeylon equation suggests that the Cub-SmC transition is accompanied with negative volume of transition. In BABH(11) and BABH(12), SmC phase is found to appear at pressures above about 10-11 MPa and 16-17 MPa, respectively.
日本液晶学会の論文
2004-09-26