Depletion potentials induced by charged colloidal rods.
We present direct depletion potential measurements for a single colloidal sphere close to a wall in suspensions of charged colloidal rods. In contrast to earlier studies of purely entropic systems (Helden et al. Phys. Rev. Lett. 2003, 90, 048301), here electrostatic interactions are important. These enhance the depletion attraction and lead to repulsive parts in the interaction potentials, indicating correlation effects between the rods.
Helden
Laurent
L
2. Physikalisches Institut, Pfaffenwaldring 57, University of Stuttgart, D-70550 Stuttgart, Germany. l.helden@physik.uni-stuttgart.de
Koenderink
Gijsje H
GH
Leiderer
Paul
P
Bechinger
Clemens
C