منابع مشابه
Depletion Force in Polydisperse Systems
The entropic depletion force, m colloids, arises when large particles are placed m a solution of smaller ones, and sterically constrained to avoid them. We calculate the interaction between two flat plates or large hard spheres (of radius R) m a solution of small and polydisperse
متن کاملDepletion 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, indi...
متن کاملGravitational collapse of depletion-induced colloidal gels.
We study the ageing and ultimate gravitational collapse of colloidal gels in which the interparticle attraction is induced by non-adsorbing polymers via the depletion effect. The gels are formed through arrested spinodal decomposition, whereby the dense phase arrests into an attractive glass. We map the experimental state diagram onto a theoretical one obtained from computer simulations and the...
متن کاملPolymer depletion profiles around nonspherical colloidal particles.
We study the effect of chain self-avoidance on the polymer density profiles that are induced by a single colloidal particle of nonspherical shape such as an ellipsoid, a dumbbell, or a lens in a solution of nonadsorbing polymers. For colloid sizes sigma much smaller than the size R(x) of the polymers, we observe a pronounced difference between ideal and self-avoiding chains. In the case of idea...
متن کاملDepletion potentials in colloidal mixtures of spheres and rods
We calculate the depletion potential between two hard spheres of radii Rs and that between one hard sphere and a planar hard wall in a sea of hard rigid spherocylindrical rods of length L and radius Rr . Unlike earlier studies our approach takes into account the true geometry of the problem and gives, to first order in the rod density, the exact depletion potential for all values of Rs , L, and...
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ژورنال
عنوان ژورنال: Physica A: Statistical Mechanics and its Applications
سال: 1995
ISSN: 0378-4371
DOI: 10.1016/0378-4371(95)00206-5