MULTILAYER FORMATION IN THIN-FILMS OF THERMOTROPIC LIQUID-CRYSTALS AT THE AIR-WATER-INTERFACE
MULTILAYER FORMATION IN THIN-FILMS OF THERMOTROPIC LIQUID-CRYSTALS AT THE AIR-WATER-INTERFACE
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DOI：
10.1021/la00019a048
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发表时间：
1994-07-01
期刊：
影响因子：
3.9
通讯作者：
MANN, JA
中科院分区：
文献类型：
--
作者：
DEMUL, MNG;MANN, JA
当热致液晶分子在空气-水界面上扩散时，可以形成有序的薄膜。这种有序性是由于它们的高偶极矩和棒状结构。我们报告了一个高度有序的4 '-辛基[1，1'-联苯基]-4-腈（8 CB）的薄膜相比，其他单层系统的空气-水界面的相关等温线测量和观察布鲁斯特角显微镜。从单层到三层的一阶相变被示出发生，在此期间，形成由单层顶部的叉指型双层组成的圆形域。的三层崩溃致密的均匀域，这被解释为堆叠的叉指状双层的结构类似的近晶层形成在散装的近晶8 CB的表面附近。动态现象合并过程中的域具有不同的层数的描述可能有类似的其他多层系统。
Molecules that form thermotropic liquid crystals can form well-ordered thin films when spread at the air-water interface. This ordering is due to their high dipole moment and rodlike structure. We report a high degree of order compared to other monolayer systems in thin films of 4'-octyl[1,1'-biphenyl]-4-carbonitrile (8CB) spread at the air-water interface by correlating isotherm measurements and observations by Brewster angle microscopy. A first-order phase transition from a monolayer to a trilayer is shown to occur, during which circular domains are formed consisting of an interdigitated bilayer on top of the monolayer. The trilayer collapses to dense homogeneous domains, which are interpreted as stacked interdigitated bilayers with a structure similar to that of the smectic layers formed in bulk nematic 8CB near the surface. Dynamical phenomena during coalescence of domains with a different number of layers are described which may have analogs in other multilayered systems.