Abstract
The three-dimensional motion of single colloidal particles close to a plane wall is measured by optical microscopy. In accordance with classical theoretical predictions, we find an asymmetric motion of the particles in the directions parallel and perpendicular to the wall. We also find that, close to the wall, the distribution functions of perpendicular steps are asymmetric, being shorter toward the wall and longer away from it.
- Received 18 May 2007
DOI:https://doi.org/10.1103/PhysRevLett.99.138303
©2007 American Physical Society