Photomechanical Response of Azobenzene Containing Monolayers on Water Surface
Photomechanical Response of Azobenzene Containing Monolayers on Water Surface
复制标题
含偶氮苯单分子膜在水面上的光机械响应
DOI：
10.1246/bcsj.69.2375
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发表时间：
1996
影响因子：
4
通讯作者：
K. Ichimura
中科院分区：
文献类型：
--
作者：
T. Seki;R. Fukuda;M. Yokoi;T. Tamaki;K. Ichimura
将两亲性聚（乙烯醇）和含有光致变色偶氮苯（Az）的相关低分子量化合物的单层铺展在水面上。研究了它们由紫外线（365 nm）和可见光（436 nm）光照射引起的光机械响应。紫外光照射诱导 Az 单层面积扩大至约 100%。数量级的三倍，这在很大程度上取决于材料、监测表面压力和亚相条件。这些分子膜的膨胀膜在可见光照射下恢复到原始区域。人们发现，使用聚合物材料有利于获得足够的机械强度，从而实现完全的再现性和更快的响应。在固定区域，在交替的紫外线和可见光照射下观察到可逆的表面压力变化，并且在 10-15 mN m−1 的 6Az10-PVA 单层中，通过观察樟脑颗粒的运动可以清楚地看到变化。如果 Az 两亲物具有...
Monolayers of amphiphilic poly(vinyl alcohol)s and related low-molecular-mass compounds containing photochromic azobenzene (Az) were spread on a water surface. Their photomechanical responses induced by photoirradiation of UV (365 nm) and visible (436 nm) light were investigated. Illumination by UV light induced area expansion of Az monolayers up to ca. three times in magnitude, which strongly depended on the material, monitoring surface pressure, and subphase conditions. The expanded film of these molecular films reverted to the original area upon illumination with visible light. Use of a polymeric material was found to be advantageous to attain sufficient mechanical strength for full reproducibility and faster response. At a fixed area, reversible surface pressure changes were observed upon alternate UV and visible light illumination, and at 10—15 mN m−1 with the 6Az10-PVA monolayer the changes could be visualized plainly by watching motions of camphor grains. In the case of an Az amphiphile having the ...