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Issue 41, 2013

Electrostatic precursor films

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When a liquid spontaneously spreads over a solid surface, a progressive microscopic structure, conventionally known as a van der Waals driven precursor film, develops ahead of the moving contact line. Here, we report a new class of electrostatically assisted precursors containing microscopic charged particles. This precursor manifests itself at the late stage of forced-spreading of a macroscopic dielectric film subjected to a unipolar ionic discharge in a gas containing particulate. We put a model forward to predict dynamic behaviour of this electrostatic precursor. The spreading of the precursor film is predicted to be proportional to the square root of the exposure time, which is consistent with the ellipsometric measurements.

Graphical abstract: Electrostatic precursor films

Supplementary files

Article information

01 Jul 2013
20 Aug 2013
First published
21 Aug 2013

Soft Matter, 2013,9, 9918-9923
Article type

Electrostatic precursor films

S. R. Mahmoudi, K. Adamiak, G. S. P. Castle and K. K. Varanasi, Soft Matter, 2013, 9, 9918 DOI: 10.1039/C3SM51802G

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