Phys. Rev. Lett. 89, 136103 (2002) [4 pages]Contrasting Friction and Diffusion in Molecularly Thin Confined FilmsReceived 8 May 2002; published 9 September 2002 We study, using fluorescence correlation spectroscopy, translational diffusion in molecularly thin liquids confined within a surface forces apparatus. The diffusion coefficient decreases exponentially from the edges towards the center of the Hertzian contact and further suggests the presence of a small number of distinct diffusion processes. This holds alike a crystallizable fluid (OMCTS) and a glass-former (1,2-propane diol), both of which displayed static friction. We conclude that friction, the average of an ensemble of molecules, masked massively heterogeneous molecular mobility. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.136103
DOI:
10.1103/PhysRevLett.89.136103
PACS:
68.35.Af, 68.08.–p, 82.56.Lz
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