Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 17, 2013
Previous Article Next Article

Capillary forces between rigid spheres and elastic supports: the role of Young's modulus and equilibrium vapor adsorption

Author affiliations

Abstract

Capillary adhesion of microparticles was analytically calculated, modelled by finite element method (FEM) simulations and measured. The effects of elastic deformation and liquid adsorption were analyzed. By means of an atomic force microscope, we measured the force between a silica bead of 2 μm radius and a planar polydimethylsiloxane surface (Young's modulus E = 1 MPa) in the presence of ethanol at different vapor pressures. Results were compared to adhesion forces measured on a silicon wafer. Independent of the sample elastic modulus experiments showed a monotonous decrease of capillary forces with increasing ethanol partial vapor pressure for P/Psat > 0.2, where Psat is the saturation vapor pressure. However, adhesion forces on the soft surface were much stronger than on the rigid silicon wafer. In order to explain the experimental results, a previous developed theory (Soft Matter, 2010, 6, 3930) was extended to take into account vapor adsorption of ethanol. Analytical calculations were compared to results of FEM simulations where the detailed deformation of the elastic support close to the meniscus was explicitly taken into account.

Graphical abstract: Capillary forces between rigid spheres and elastic supports: the role of Young's modulus and equilibrium vapor adsorption

Back to tab navigation

Supplementary files

Article information


Submitted
27 Dec 2012
Accepted
01 Mar 2013
First published
21 Mar 2013

Soft Matter, 2013,9, 4534-4543
Article type
Paper

Capillary forces between rigid spheres and elastic supports: the role of Young's modulus and equilibrium vapor adsorption

M. Zakerin, M. Kappl, E. H. G. Backus, H. Butt and F. Schönfeld, Soft Matter, 2013, 9, 4534
DOI: 10.1039/C3SM27952A

Social activity

Search articles by author

Spotlight

Advertisements