title: Nonlinear response and crowding effects in microrheology.
abstract: The mobility of tagged particles in a microrheological setup has been investigated via molecular dynamics simulations of a three-dimensional Lennard-Jones binary mixture. After coupling a small number of particles to a constant external driving force, the drift velocity and other observables of the dragged probe particles are reported in the linear and nonlinear response regime. In the nonlinear regime significant crowding effects are observed, thereby creating stringlike structures. Formation of the strings further enhances the nonlinear effects. A systematic study of these effects' dependence on temperature and total number of driven probe atoms is presented.
authors: Westfälische Wilhelms-Universität Münster, Institut für physikalische Chemie, Corrensstrasse 30, 48149 Münster, Germany. imad@ump.gwdg.de
authors: I
authors: I
authors: Ladadwa
authors: A
authors: A
authors: Heuer
mesh_terms: D003102:Colloids / Q000737:chemistry*; D003198:Computer Simulation; D044085:Microfluidics / Q000379:methods*; D008956:Models, Chemical; D017711:Nonlinear Dynamics; D010316:Particle Size
chemical_list: D003102:Colloids