How confined lubricants diffuse during shear
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- How confined lubricants diffuse during shear
- Mukhopadhyay, A; Bae, Sung Chul; Zhao, J; Granick, Steve
- Issue Date
- AMERICAN PHYSICAL SOC
- PHYSICAL REVIEW LETTERS, v.93, no.23, pp.236105
- The translational diffusion of a fluorescent dye embedded at a dilute concentration in a confined fluid was compared at rest and during shear. The fluid, octamethylcyclotetrasiloxane (OMCTS), was confined between step-free muscovite mica to thickness 3-4 layers. Fluorescence correlation spectroscopy showed that the time scales of intensity-intensity autocorrelation functions were essentially the same during shear and at rest, except they were faster during shear by a factor of 2 to 5. This dynamical probe of how liquids order in molecularly thin films fails to support the hypothesis that shear produced a melting transition.
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