Using light to study boundary lubrication: spectroscopic study of confined fluids
Using light to study boundary lubrication: spectroscopic study of confined fluids
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DOI：
10.1098/rsta.2007.2167
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发表时间：
2008-04-28
期刊：
影响因子：
5
通讯作者：
Granick, Steve
中科院分区：
文献类型：
--
作者：
Bae, Sung Chul;Wong, Janet S.;Granick, Steve
几种仪器的发展，以检查分子薄的流体之间的云母片的光谱响应进行了说明。它们是基于使用重新设计的表面力装置，其中对所需光波长的光透明的电介质涂层保留在其他光波长测量干涉厚度的能力。最近的测量的例子是使用共焦激光拉曼光谱来评估分子如何取向以及执行化学成像。其他的例子提出了使用共焦荧光恢复后，光漂白，以评估有限的聚合物熔体的平移扩散。强调了在分子水平上将机械平均（力和摩擦）与结构和流动性的直接信息分离的优点。
Several instrumental developments to examine the spectroscopic response of molecularly thin fluids confined between mica sheets are described. They are predicated on using a redesigned surface forces apparatus where dielectric coatings, transparent to light at needed optical wavelengths, retain the ability to measure interferometric thickness at other optical wavelengths. Examples of recent measurements are presented using confocal laser Raman spectroscopy to evaluate how molecules orient as well as to perform chemical imaging. Other examples are presented using confocal fluorescence recovery after photobleaching to evaluate translational diffusion of confined polymer melts. The advantage of separating the mechanical average ( force and friction) from direct information about structure and mobility at the molecular level is stressed.