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50 Years of Fundamentals of the Homogeneous Charge Double Layer Model (CROSBI ID 469989)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija

Mirnik, Mirko 50 Years of Fundamentals of the Homogeneous Charge Double Layer Model // Electrokinetic Phenomena '98, Theory, Methods and Applications, Proceedings, / Ribitsch, Volker (ur.). Graz: Universität Graz, 1998. str. P1/04-x

Podaci o odgovornosti

Mirnik, Mirko

engleski

50 Years of Fundamentals of the Homogeneous Charge Double Layer Model

Charging reactions and electric potential functions of different double layer theories of typical colloidal systems are described graphically. The main emphasis is put on the description of the point charge double layer model and its theoretical postulates. The theoretical postulates are compared with experimental results published by many world laboratories. It is demonstrated that they all support the point charge double layer model. It is demonstrated that the Debye-Hückel length of ions fixed on the surface of particles is a multiple of the same length of the ions in the bulk of electrolyte. The dependence of the electrolytic mobility is inversely proportional to the radius of the ion atmosphere of the ions that are fixed oh the surface of colloidal particles. The functions “electrolytic mobility versus coagulating counter-ion concentration and its charge number” is described and compared with experimental plots of some inorganic sols and organic lattices. The dependence of the adsorbed amount of constituent ions, e.g., of I-, on fresh precipitates, e.g., AgI, is defined and the influence on their starting concentration and concentration of added electrolytes is demonstrated. It is proved that the aged AgI precipitates peptize under the influence of electrolytes and that the peptized particles coagulate under practically identical condition as the fresh precipitates. It is demonstrated that the coagulated AgI is an ideal counter ion exchanger of very low exchanging capacity. The exchanging concentrations depend on the charge numbers and on the concentrations of the exchanging ions. Using the light scattering technique the kinetics of coagulation of inorganic sols is demonstrated to be of the second order. Also, the dependence of the critical coagulation concentration on the constituent ion concentration, on its charge number and on the solvent composition is demonstrated. The single particle light scattering technique proves that lattices coagulate by the second order reaction mechanism. It is proved that the colloidal crystals are formed because of their extremely high charge per particle number and in the absence of any electrolytes. Their crystallographic form is either body or face centered cubic. It can not be hexagonal as it may be concluded from the hexagonal patterns of the microphotographs.

Double Layer Model

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Podaci o prilogu

P1/04-x.

1998.

nije evidentirano

objavljeno

Podaci o matičnoj publikaciji

Electrokinetic Phenomena '98, Theory, Methods and Applications, Proceedings,

Ribitsch, Volker

Graz: Universität Graz

Podaci o skupu

Electrokinetic Phenomena '98, Theory, Methods and Applications

poster

14.04.1998-17.04.1998

Salzburg, Austrija

Povezanost rada

Kemija