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首页> 外文会议>Liquid Crystals and Applications in Optics; Proceedings of SPIE-The International Society for Optical Engineering; vol.6587 >Photochemical manipulation of colloidal structures in liquid-crystal colloids
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Photochemical manipulation of colloidal structures in liquid-crystal colloids

机译：液晶胶体中胶体结构的光化学处理

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We investigated photochemical manipulation of physical properties and colloidal structures of liquid-crystal (LC) colloids containing azobenzene compounds. In a LC suspension where polymeric particles were dispersed in a host LC, we achieved photochemical control of light-scattering properties of the suspension. In a nematic phase, when the suspension was sandwiched with two glass plates, the film became opaque. This would be attributable to an appearance of both multidomain structures of LC alignment and mismatches of refractive indices between the materials. The opaque state turned into a transparent one when a nematic-to-isotropic phase transition was induced by the trans-to-cis photoisomerization of the azo-dye. This will result from a disappearance of both the multidomain structures and the refractive-index mismatches in the isotropic phase. The transparent film went back into the initial opaque film when the nematic phase was obtained by the cis-to-trans photoisomerization. In a LC emulsion in which glycerol or water droplets were dispersed in liquid crystals, we examined photochemical change of defect structures and inter-droplet distances by the photochemical manner. At the initial state, Saturn ring and hedgehog defects were formed around the droplets. For the glycerol droplets, we observed structural transformations between Saturn ring and boojums on irradiation with ultra-violet and visible light. For the water droplets, the inter-droplet distances varied by changing defect size on the irradiation. These phenomena would result from modulation of anchoring conditions of the droplets by the photoisomerization of the azo-dyes.
机译：我们研究了含有偶氮苯化合物的液晶（LC）胶体的物理性质和胶体结构的光化学处理。在将聚合物颗粒分散在主体LC中的LC悬浮液中，我们实现了悬浮液光散射特性的光化学控制。在向列相中，当悬浮液被两个玻璃板夹在中间时，薄膜变得不透明。这归因于LC取向的多畴结构的出现和材料之间的折射率的失配。当偶氮染料的反式-顺式光异构化诱导向列相向各向同性的相变时，不透明状态变为透明状态。这将归因于多畴结构的消失和各向同性相中折射率的不匹配。当通过顺式至反式光异构化获得向列相时，透明膜又回到初始的不透明膜。在甘油或水滴分散在液晶中的LC乳液中，我们通过光化学方法检查了缺陷结构的光化学变化和液滴间距离。在初始状态下，在液滴周围形成土星环和刺猬缺陷。对于甘油液滴，我们在紫外线和可见光照射下观察到土星环和布胡姆之间的结构转变。对于水滴而言，液滴间距离通过改变照射时的缺陷尺寸而变化。这些现象将归因于偶氮染料的光异构化对液滴的锚定条件的调节。

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