Hydrodynamics of particle–wall interaction in colloidal probe experiments: comparison of vertical and lateral motion
Year: 2003
Type: article
Abstract: The hydrodynamic interaction between a colloidal particle attached to the tip of an atomic force microscope (AFM) and a wall has been investigated as a function of the angle of inclination of the cantilever with respect to the surface. For high inclination of the cantilever, the motion mostly occurs in the tangential direction. A frequency-dependent drag coefficient is extracted from the cantilever's Brownian motion. In agreement with theoretical predictions, the wall-induced drag for tangential motion is much weaker than that for vertical motion. Mechanical properties of the surface are more easily probed with tangential motion because the hydrodynamic effects do not mask the surface's intrinsic properties as much as for vertical motion.
Authors: Farida Benmouna, Diethelm Johannsmann
Institutions: Max Planck Society, Max Planck Institute for Polymer Research
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funder: Alexander von Humboldt-Stiftung
OpenAlex ID: W2023937755