2004/06/11 by Vladimir Lobaskin, Burkhard Duenweg, Burkhard Dünweg +1 · 3 citations
Chemistry · Engineering · Physics and Astronomy · #Electrostatics and Colloid Interactions #Microfluidic and Bio-sensing Technologies #Microfluidic and Capillary Electrophoresis Applications #cond-mat.soft
paper · pdf · doi:10.1088/0953-8984/16/38/021
published as J. Phys.: Condens. Matter 16, S4063-S4073 (2004) · 15 pages, 8 figures
arxiv created 2004/06/11 · openalex publication_date 2004/09/11 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
We study the mobility of a charged colloidal particle in a constant homogeneous electric field by means of computer simulations. The simulation method combines a lattice Boltzmann scheme for the fluid with standard Langevin dynamics for the colloidal particle, which is built up from a net of bonded particles forming the surface of the colloid. The coupling between the two subsystems is introduced via friction forces. In addition, explicit counterions, also coupled to the fluid, are present. We observe a non-monotonic dependence of the electrophoretic mobility on the bare colloidal charge. At low surface charge density we observe a linear increase of the mobility with bare charge, whereas at higher charges, where more than half of the ions are co-moving with the colloid, the mobility decreases with increasing bare charge.