通过表面力仪-傅里叶变换外腔式相干光谱学研究受限和剪切罗丹明B薄膜的特性。

Properties of confined and sheared rhodamine B films studied by SFA-FECO spectroscopy.

作者信息

Alig Anna R Godfrey, Gourdon Delphine, Israelachvili Jacob

机构信息

Department of Chemical Engineering, University of California, Santa Barbara, California 93106, USA.

出版信息

J Phys Chem B. 2007 Jan 11;111(1):95-106. doi: 10.1021/jp050783g.

DOI:10.1021/jp050783g

PMID:17201433

Abstract

We have used a surface forces apparatus and multiple beam interferometry to measure the absorbance of thin films of rhodamine B in water/ethylene glycol solutions while applying and measuring normal and lateral (shear) forces. Both normal and shear forces induced changes in the absorption spectra indicating a change in molecular alignment, and rhodamine-rhodamine and rhodamine-surface interactions. We also measured differences in the absorbance spectra in different regions of the contact indicating, as expected, that the stresses are not uniform throughout the contact area. We also observed crystallization (solidification) parallel to the shearing direction.

摘要

我们使用了表面力仪和多光束干涉测量法，在施加和测量法向力与横向（剪切）力的同时，测量了罗丹明B在水/乙二醇溶液中的薄膜吸光度。法向力和剪切力均引起吸收光谱的变化，表明分子排列、罗丹明-罗丹明和罗丹明-表面相互作用发生了变化。我们还测量了接触不同区域的吸光度光谱差异，正如预期的那样，这表明整个接触区域的应力并不均匀。我们还观察到了与剪切方向平行的结晶（固化）现象。