Detection of molecular alignment in confined films
Detection of molecular alignment in confined films
复制标题
检测受限薄膜中的分子排列
DOI：
10.1126/science.287.5452.468
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发表时间：
2000
期刊：
影响因子：
56.9
通讯作者：
Michael Grunze
中科院分区：
文献类型：
--
作者：
F. Eisert;Martin Gurka;A. Legant;Manfred Buck;Michael Grunze
利用光学二次谐波技术研究了机械载荷作用下玻璃表面自组装硅烷单层膜的面内取向。测量允许作用在单层上的宏观力与终端分子实体的平均取向和方位角分子排列的相关性。压缩力和剪切力导致初始随机取向的分子在宏观长度尺度上对齐。在12小时的时间尺度上，发现在机械应力下分子的方位角排列的变化是不可逆的，而分子的倾斜角的变化是可逆的。
Optical second harmonic generation was used to study the in-plane alignment of self-assembled silane monolayers attached to a glass surface under mechanical loading. The measurements allow correlation of the macroscopic forces acting on the monolayer with the average orientation and the azimuthal molecular alignment of the terminal molecular entity. Compression and shear forces lead to an alignment of the initially randomly oriented molecules on a macroscopic length scale. The change in azimuthal alignment of molecules under mechanical stress was found to be irreversible on the time scale of 12 hours, whereas changes of the molecular tilt angle were reversible.