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

J Phys Chem B

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

Published: January 2007

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.

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http://dx.doi.org/10.1021/jp050783gDOI Listing

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