A Short Textbook of Colloid Chemistry by B. Straumanis, M.E. Jirgensons

By B. Straumanis, M.E. Jirgensons

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Tables are available to facilitate the estimation 40 KINETIC PROPERTIES OF DISPERSE SYSTEMS of D from the determined concentration values in different layers in certain time intervals. The values for D obtained in diffusion experiments with colloids can be introduced in the equation (3), so that Ν or r can be calculated. The value of Z>, which SVEDBERG obtained experimentally from FICK'S law for a particular gold sol, if introduced in (3), gives r the value of 1-29. This is quite close to the ultra-microscopically determined value of 1-33.

H . NORTHROP and M . L. ANSON; / . Gen. Physiol. 12, 543 (1929). G S HARTLEY and D . F . RUNNICLES; Proc. Roy. Soc. (London), A 168, 401 (1938). DIFFUSION 41 COEFFICIENTS thick. A draw slide S separates the solution from the solvent, and the boundary is formed by withdrawal of S by means of an electromagnet / . The right part of the cell serves as a standard of comparison. The ( 1 2) cell is mounted in front of a horizontally placed microscope. Ultra-microscopical investigation of the diffusion of colloidal gold and selenium have been made in SVEDBERG'S laboratory by WESTGREN.

FLORY; Principles of Polymer Chemistry (Cornell University Press, Ithaca, N . Y . 1953) Chaps. 7, 1 0 and 12); J. STAUFF, Kolloidchemie (Springer, Berlin, 1960). CHAPTER 5 INTERFACIAL P H E N O M E N A O F the variety of interfacial phenomena and processes occurring on surfaces, only those which are directly connected with the chemistry or physics of colloids will be considered in this chapter. Interfacial reactions and events are of paramount importance in colloidal chemistry. A colloidal solution has two kinds of interface, firstly, the macroscopic interfaces which the solution shares with air (gas/liquid) ; with the walls of the container (liquid/solid) ; or with another liquid by which the solution may be covered (liquid/liquid).

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