title: Measuring a colloidal particle's interaction with a flat surface under nonequilibrium conditions. Total internal reflection microscopy with absolute position information.
abstract: A new and general approach is proposed to analyze the dynamics of a colloidal particle interacting with a nearby wall. This analysis can be used to determine the acting forces even when the system is non-stationary. As an illustration, we use total internal reflection microscopy to investigate the forces acting on a polystyrene sulfate latex particle as it is receding from a charged glass surface.
authors.affiliation: Dept. of Physics, James Franck Institute, and Institute for Biophysical Dynamics, The University of Chicago, Chicago, IL 60637, USA.
authors.forename: S H
authors.initials: SH
authors.lastname: Behrens
authors.forename: J
authors.initials: J
authors.lastname: Plewa
authors.forename: D G
authors.initials: DG
authors.lastname: Grier