Influence of the counterion and Co-ion diffusion coefficient values on some dielectric and electrokinetic properties of colloidal suspensions

Article Abstract:

The dependencies of the conductivity increment, the electrophoretic mobility, and the permittivity increment on the counterion diffusion coefficient value were numerically determined. The use of the network simulation method made it possible to solve the governing equations for the whole range of counterion and co-ion diffusion coefficients and for very low frequencies, despite the far reaching field-induced charge density outside the double layer.

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Cobalt Compounds, Electric properties, Electrochemistry, Chemical properties

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Low-frequency dielectric dispersion in colloidal suspensions of uncharged insulating particles

Article Abstract:

Rigorous analytical results that show that the LFDD is also to be expected in suspensions o uncharged particles when the diffusion coefficients are presented. The standard electrokinetic equations for a spherical uncharged insulating particle suspended in a binary electrolyte solution with an applied ac electric field are analytically solved in the general case when both the ion diffusion coefficients and valences have arbitrary values.

Photochemical research, Electrokinetics, Electric insulators, Electrical insulators, Photochemistry, Colloid chemistry

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On the use of the hypothesis of local electroneutrality in colloidal suspensions for the calculation of their dielectric properties

Article Abstract:

The validity of the hypothesis of electroneutrality outside the double layer of a suspended particle with an applied ac electric field is analyzed. It is shown that the electrolyte solution remains electroneutral for distances greater than a few Debye lengths from the particle surface only when the diffusion coefficients of the two ion species are identical.

Ions, Electrolytes, Electric fields

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