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

By B. Straumanis, M.E. Jirgensons

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FÜRTH; Physik. Ζ. 26, 719 (1925); / . Sei. Instrum. 22, 61 (1945). A . L. , New York 1949), pp. 562-616. 42 KINETIC PROPERTIES OF DISPERSE SYSTEMS ( 1 2 )a recently by TSVETKOV and K x E N i N . These authors determined the small variations of the concentration in the diffusion cell by means of a polarisation interferometer. The method was successfully applied to the study of diffusion of linear polymers. Sedimentation equilibrium Brownian movement is the cause of diffusion, and in a diffusion cylinder the particles are driven up, eventually to spread evenly throughout the whole solvent.

STAUFFER, in WEISSBERGER'S Technique of Organic Part I (Interscience, New York 1956) p. 65 if. Chemistry, vol. Ill, F L O C C U L A T I O N E X P E R I M E N T S 27 standing for five minutes the tubes are compared. N o w there is no change in the first three, but the sols of albumin and gelatin have become quite turbid. The colloids like Ag-sol and ferric hydroxide, which are easily flocculated by electrolytes, are lyophobic or hydrophobic. The hydrophilic sols of albumin or gelatin, however, are stable toward electrolytes, but are flocculated by alcohol.

This electrodialysis is carried out in a three compartment apparatus (Fig. 5) ; the middle compartment is separated from each outer compartment by a semipermeable membrane. The sol is poured into the middle compartment ; through the other two cells flows distilled water. The two electrodes, usually platinum gauzes or perforated platinum ( 2) The discs, are inserted into the outer cells close to the m e m b r a n e s . applied electrical potential then pulls all micromolecular ions through the membranes into the water.

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