DPG Phi
Verhandlungen
Verhandlungen
DPG

Regensburg 2013 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

O: Fachverband Oberflächenphysik

O 44: Scanning Probe Methods I

O 44.9: Talk

Wednesday, March 13, 2013, 12:30–12:45, H33

Capillary forces between a rigid sphere and an elastic half -space: the role of Young’s modulus and equilibrium vapor adsorptionMarjan Zakerin1, •Michael Kappl1, Ellen Backus1, Hans-Jürgen Butt1, and Friedhelm Schönfeld21Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz — 2Hochschule RheinMain, Faculty of Engineering, Am Brückweg 10, 65428 Rüsselsheim

Capillary adhesion of microparticles to a deformable substrate was analytically calculated, simulated by finite element simulations and measured with an atomic force microscope. The effects of elastic deformation and liquid adsorption were analyzed. Using an atomic force microscope, we measured the force between a silica bead of 2 µm radius and a silicon wafer (Young’s modulus E = 170 GPa) and polydimethylsiloxane (PDMS, E = 1 MPa) in the presence of ethanol at different vapor pressures. Adhesion forces on soft surface were much stronger than on rigid samples. In order to fully explain the experimental results, the previous developed theory by Butt et al. (1) was extended to take into account vapor adsorption of ethanol. Calculations were compared to results of finite element (FEM) simulations taking the detailed deformation of the elastic support close the meniscus explicitly into account.

(1) H.-J. Butt, W. J. P. Barnes, A. del Campo, M. Kappl and F. Schönfeld, Soft Matter, 2010, 6, 5930

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2013 > Regensburg