Crystallization in thin liquid films induced by shear
Article Abstract:
The use of measurements and optical absorption spectroscopy in the surface forces apparatus to measure a shear-induced phase transition of an anisotropic (dye) molecule confined between two shearing mica surfaces in aqueous solution. The studies on the shear-induced ordering and friction forces of highly anisotropic cyanine dye molecules in thin water films show a weak effect of molecular anisotropy on shear-induced ordering, friction forces, and the onset of shear-induced crystallization.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2005
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Triboelectrification between smooth metal surfaces coated with self-assembled monolayers (SAMs)
Article Abstract:
The friction and triboelectrification between both similar and dissimilar molecularly smooth hexadecanethiol-coated metal surfaces on mica substrates were simultaneously measured using a modified surface forces apparatus. Results indicate that frictional dissipation induces electron-hole formation and charge transfer between two shearing surfaces due to molecular-level roughness and defects and local dielectric constant changes, giving rise to the observed tribocurrents.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
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Properties of confined and sheared rhodamine B films studied by SFA-FECO spectroscopy
Article Abstract:
A surface forces apparatus and multiple beam interferometry are used to measure the absorbance of thin films of rhodamine B in water/ethylene glycol solutions while applying and measuring normal and lateral (shear) forces. These forces induced changes in the absorption spectra indicating a change in molecular alignment and rhodamine-rhodamine and rhodamine-surface interactions.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2007
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