Pre-Transitional Surface Ordering and Disordering at Liquid Crystal-Isotropic Liquid Interface
作者:
A.K. George,
K.P. Mohandas,
期刊:
Physics and Chemistry of Liquids
(Taylor Available online 1995)
卷期:
Volume 30,
issue 4
页码: 233-242
ISSN:0031-9104
年代: 1995
DOI:10.1080/00319109508030670
出版商: Taylor & Francis Group
关键词: Liquid crystals;surface order;interfacial tension
数据来源: Taylor
摘要:
The existence of pre-transitional surface ordering and disordering at the liquid crystal-isotropic liquid interface has been established from the surface tension measurements. A spinning-drop technique has been used for this study. Measurements were carried out in the smecticA(SA), nematic (N) and isotropic (I) phases of the liquid crystals and reproducible results were obtained. The results suggest that the equilibrium value of γ changes discontinuously in theNandSAphases. The slopedγ/dTis positive for both the isotropic phase just aboveTNIas well as for the nematic phase just below it. Similar positive slope has been obtained in the vicinity ofTAN. A positive value of dγ/dt implies excess surface order than that of the bulk interior. From the density measurements it has been observed that there is a correlation between the anomalies in the temperature dependence of surface tension and density in the isotropic phase.
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