Jun 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972rspsa.328..541s&link_type=abstract
Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 328, Issue 1575, pp. 541-560
Physics
Scientific paper
A new type of squeeze film apparatus is described which thins a liquid between a metal surface and liquid mercury. By this means contamination by dirt is circumvented. The thickness of the film is determined from capacitance measurements. Anomalous layers up to 2.5 × 103 nm are formed when the liquid (cetane) contains an additive (1/10% stearic acid) which reacts with the metal, which here is chromium or iron. Platinum forms no such film. A non-reactive additive, cetylamine, gives no film with Fe, Cr or Pt, even though the material is highly surface active. Tests at different temperatures reveal a positive relation between temperature and thickness. This is evidence that the film is organized by chemical rather than physical forces. It also allows a figure to be obtained for the energy of activation of the layer. The apparatus will measure down to 1.8 nm in the case of a retracted monolayer. Evidence is put forward pointing towards anomalous surface viscosities.
Cameron Andrew
Smith Anthony J.
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