Author(s): Sunil K. Sainis, Vincent Germain, Cecile O. Mejean, and Eric R. Dufresne


“We study the electrostatic and hydrodynamic interactions of colloidal particles in nonpolar solvents. Using blinking optical tweezers, we can extract the screening length, K-1, the effective surface potential, |eζ*|, and the hydrodynamic radius, ah, in a single measurement. We apply this technique to suspensions of polystyrene and poly(methyl methacrylate) particles in hexadecane with soluble charge control agents, aerosol sodium di-2-ethylhexylsulfosuccinate (AOT) and polyisobutylene succinimide (OLOA-1200). We find that the electrostatic interactions of these particles depend sensitively on surface composition as well as on the concentration and chemistry of the charge control agent.”

Link to Publications Page

Publication: Langmuir
Issue/Year: Langmuir, 2008, 24 (4), pp 1160–1164
DOI: 10.1021/la702432u