Brownian motion in asymmetric two-dimensional colloidal mixtures

✍ Scribed by M. Chávez-Páez; J.L. Arauz-Lara; M. Medina-Noyola

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 439 KB
• Volume: 71
• Category: Article
• ISSN: 0167-7322
• DOI: 10.1016/s0167-7322(97)00015-9

✦ Synopsis

In this paper we report some aspects of our work on the description of tracerdiffusion phenomena in model two-dimensional binary colloidal mixtures. Here we study the effects of asymmetries between the two brownian species. In particular, we consider the effects of the dynamic asymmetry produced when the free-diffusion mobility of one of the species is reduced, thus resembling a sluggish porous matrix permeated by a colloidal liquid (the species with a "normal" free-diffusion mobility). This study consists mostly of Brownian dynamics simulations, but a theoretical interpretation of the results is also attempted, with the assistance of an approximate theory of tracer-diffusion in equilibrium colloidal mixtures (the single exponential approximation).