Anisotropic Brownian diffusion near a nanostructured surface.
The Brownian diffusion of sub-micrometer-sized particles (diameter 0.52 microm) in the vicinity of a nanostructured surface was experimentally characterized. The surface consisted of a repeating pattern of rectangular grooves with depth 35 nm and pitch 400 nm. It was found that the one-dimensional particle diffusivity parallel to the nanogrooves was significantly higher than the diffusivity perpendicular to the grooves (1.518+/-0.274 (S.E.) microm2/s compared to 0.704+/-0.090 microm2/s). No such anisotropy in the one-dimensional Brownian diffusivity was found for particles near a flat surface.
King
Michael R
MR
Department of Chemical Engineering, University of Rochester, Rochester, NY 14642, USA. mike_king@urmc.rochester.edu
D016880:Anisotropy; D004058:Diffusion; D049329:Nanostructures / Q000737:chemistry*