Transient responses of a wetting film to mechanical and electrical perturbations

Manica, Rogerio, Connor, Jason N., Clasohm, Lucy Y., Carnie, Steven L., Horn, Roger G. and Chan, Derek Y. C. 2008, Transient responses of a wetting film to mechanical and electrical perturbations, Langmuir, vol. 24, no. 4, Special issue : Molecular and surface forces, pp. 1381-1390, doi: 10.1021/la701562q.

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Title Transient responses of a wetting film to mechanical and electrical perturbations
Author(s) Manica, Rogerio
Connor, Jason N.
Clasohm, Lucy Y.
Carnie, Steven L.
Horn, Roger G.
Chan, Derek Y. C.
Journal name Langmuir
Volume number 24
Issue number 4
Season Special issue : Molecular and surface forces
Start page 1381
End page 1390
Total pages 10
Publisher American Chemical Society
Place of publication Washington, D. C.
Publication date 2008
ISSN 0743-7463
Summary This article reports real-time observations and detailed modeling of the transient response of thin aqueous films bounded by a deformable surface to external mechanical and electrical perturbations. Such films, tens to hundreds of nanometers thick, are confined between a molecularly smooth mica plate and a deformable mercury/electrolyte interface on a protuberant drop at a sealed capillary tube. When the mercury is negatively charged, the water forms a wetting film on mica, stabilized by electrical double layer forces. Mechanical perturbations are produced by driving the mica plate toward or by retracting the mica plate from the mercury surface. Electrical perturbations are applied to change the electrical double layer interaction between the mica and the mercury by imposing a step change of the bias voltage between the mercury and the bulk electrolyte. A theoretical model has been developed that can account for these observations quantitatively. Comparison between experiments and theory indicates that a no-slip hydrodynamic boundary condition holds at the molecularly smooth mica/electrolyte surface and at the deformable mercury/electrolyte interface. An analysis of the transient response based on the model elucidates the complex interplay between disjoining pressure, hydrodynamic forces, and surface deformations. This study also provides insight into the mechanism and process of droplet coalescence and reveals a novel, counterintuitive mechanism that can lead to film instability and collapse when an attempt is made to thicken the film by pulling the bounding mercury and mica phases apart.
Notes First published online 27th July, 2007
Language eng
DOI 10.1021/la701562q
Field of Research 030603 Colloid and Surface Chemistry
020303 Fluid Physics
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2008, American Chemical Society
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Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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