An experimental study of a model colloid-polymer mixture
نویسندگان
چکیده
We report an experimental study of the phase bebaviour of a model hard sphere colloid + non-adsorbing polymer mixture sterically stabilised PMMA (radius = 217 nm) and polystyrene (r~ = 12.8 nm ) in cis-decalin. It was found'that the main effect of adding polymer was to expand the fluid-crystal coexistence region of the colloidal suspension, which
منابع مشابه
Depletion-induced phase separation in colloid-polymer mixtures.
Phase separation can be induced in a colloidal dispersion by adding non-adsorbing polymers. Depletion of polymer around the colloidal particles induces an effective attraction, leading to demixing at sufficient polymer concentration. This communication reviews theoretical and experimental work carried out on the polymer-mediated attraction between spherical colloids and the resulting phase sepa...
متن کاملMixtures of charged colloid and neutral polymer: influence of electrostatic interactions on demixing and interfacial tension.
The equilibrium phase behavior of a binary mixture of charged colloids and neutral, nonadsorbing polymers is studied within free-volume theory. A model mixture of charged hard-sphere macroions and ideal, coarse-grained, effective-sphere polymers is mapped first onto a binary hard-sphere mixture with nonadditive diameters and then onto an effective Asakura-Oosawa model [S. Asakura and F. Oosawa,...
متن کاملCritical behavior of colloid-polymer mixtures in random porous media.
We show that the critical behavior of a colloid-polymer mixture inside a random porous matrix of quenched hard spheres belongs to the universality class of the random-field Ising model. We also demonstrate that random-field effects in colloid-polymer mixtures are surprisingly strong. This makes these systems attractive candidates to study random-field behavior experimentally.
متن کاملConcentration Fluctuations in a Model Colloid-Polymer Suspension : experimental Tests of Depletion Theories
A light scattering turbidity method has been employed to measure the dimensionless colloidal osmotic compressibility of carefully characterized model athermal colloid (silica)-polymer (polystyrene) suspensions. Mixture thermodynamics is controlled by purely repulsive, hard sphere interactions between the particles while the polymer is in a good solvent. Polymer size is varied by nearly 2 orders...
متن کاملAdsorption properties of a colloid-polymer mixture confined in a slit pore.
The soft fundamental-measure theory, which was based on the additive colloid-polymer mixture [M. Schmidt, Phys. Rev. E 62, 3799 (2000)] has been employed to investigate the adsorption of a colloid-polymer mixture within a hard slit pore. The calculated results show that the adsorption for the confined colloid-polymer mixture is very different from those of the colloid-colloid and polymer-polyme...
متن کامل