Viscosity-dependent liquid slip at molecularly smooth hydrophobic surfaces.

Phys Rev E Stat Nonlin Soft Matter Phys

Department of Physics, Cardwell Hall, Kansas State University, Manhattan, Kansas 66506-2601, USA.

Published: December 2009

Colloidal probe atomic force microscopy is used to study the slip behavior of 18 Newtonian liquids from two homologous series, the n-alkanes and n-alcohols, at molecularly smooth hydrophobic n-hexadecyltrichlorosilane coated surfaces. We find that the slip behavior is governed by the bulk viscosity eta of the liquid, specifically, the slip length b approximately etax with x approximately 0.33. Additionally, the slip length was found to be shear rate independent, validating the use of Vinogradova slip theory in this work.

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http://dx.doi.org/10.1103/PhysRevE.80.060601DOI Listing

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