55 research outputs found
Complex Investigations of Double Layer of Colloid Particles. Electric Conductivity of Suspensions and Anisotropy of Electrophoresis
Conditions for obtaining quantitative .ililformation on the double
layer of colloid particles on the basis of electrosurface measurements
have been analyzed. A rigorous theory of electric conductivdty
of diluted suspensions on the basis of induced dilpole
moments of particles has been presented.
The .isoconductance point of a suspension has been shown to
codncide wd.th the isopolarisation state of a particle. A theory of
anisotropy of the electrophoresis of long rod-like particles has been
put forward. The identity of the formules of electrophoresis of a
sphere and of cylindrical particles oriented pevpendicular towards
the field at a small thickness of the double layer has been shown.
A good agreement has been found between the values of induced
dipole moments and, specific surface conductivity in a wide electrolite
concentration range measured by the methods of electric
conductivity of suspensions and anisotropy of electrophoresis. The
theories of induced dipole moment, electric conductivity of suspension
and anisotropy of electrophoresis have been experimentally
examined
Slow coagulation and relaxation of the compact part of the double layer.
The departure from equilibrium of the electric double layers of colloid particles is taken into account in the theory on the electrostatic interaction of such particles. This departure leads to an additional component of the disjoining pressure, which just as the viscous force of a thinning liquid interlayer, is proportional to the rate of mutual approach of particles. Therefore, siwww.lw20.commilarly to hydrodynamic interaction, the departure from equilibrium of the interacting double layers of particles leads to a decrease of their Brownian interdiffusion coefficient. Due to this new effect, the rate of slow coagulation can decrease in the order of magnitude. The theory is developed as applied to the interaction of plate-like particles and Martynov's double layer mode
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