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Issue 20, 2017
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van der Waals interaction between a moving nano-cylinder and a liquid thin film

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Abstract

We study the static and dynamic interaction between a horizontal cylindrical nano-probe and a thin liquid film. The effects of the physical and geometrical parameters, with a special focus on the film thickness, the probe speed, and the distance between the probe and the free surface are analyzed. Deformation profiles have been computed numerically from a Reynolds lubrication equation, coupled to a modified Young–Laplace equation, which takes into account the probe/liquid and the liquid/substrate non-retarded van der Waals interactions. We have found that the film thickness and the probe speed have a significant effect on the threshold separation distance below which the jump-to-contact instability is triggered. These results encourage the use of horizontal cylindrical nano-probes to scan thin liquid films, in order to determine either the physical or geometrical properties of the latter, through the measurement of interaction forces.

Graphical abstract: van der Waals interaction between a moving nano-cylinder and a liquid thin film

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Publication details

The article was received on 06 Mar 2017, accepted on 01 May 2017 and first published on 03 May 2017


Article type: Paper
DOI: 10.1039/C7SM00467B
Citation: Soft Matter, 2017,13, 3822-3830
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    van der Waals interaction between a moving nano-cylinder and a liquid thin film

    R. Ledesma-Alonso, E. Raphaël, T. Salez, P. Tordjeman and D. Legendre, Soft Matter, 2017, 13, 3822
    DOI: 10.1039/C7SM00467B

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