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.

Crystallography, Shear (Mechanics), Properties

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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.

Monomolecular films, Charge transfer, Structure

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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.

All Other Basic Organic Chemical Manufacturing, CHEMICALS AND ALLIED PRODUCTS, Ethylene Glycol, Usage, Interferometry

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