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The Chemistry of Colloids by Richard Zsigmondy

By Richard Zsigmondy

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Phys. (4), 10, 1-39 (1903). -Zeit,, 1, (1909) CLASSIFICATION 31 have a mass of about 10~ 15 mg. * Colored Sodium Chloride. Siedentopff has shown that colored chloride, which can be obtained by heating in vacuum in the presence of sodium vapor, is filled with ultramicrons. These have the appearance and show all the properties of a finely divided metal. Precisely as in the case of ruby glass, the color of sodium chloride changes with the temperature. These color variations are attributed to changes sodium in the metallic submicrons.

Regnault f assumed that the heating of the particles on one side more than the others caused small convection currents and this accounted for the vibrating movement of the particles. Wiener t concluded that it was a movement peculiar to the liquid state, imperceptible of itself but rendered manifest by the colloidal particles. According to Quincke the Brownian movement is due to the spreading out of layers of liquid over the surface of the particles. A really useful theory was first arrived at by the application of the kinetic hypothesis.

140, 1468, 1544-1547 (1905); Joura. de chim. , J. 29-56 (1907). ** B. Moore and H. E. Roaf: Biochemical ft R. S. Lillie: it W. Biltz Amer. Journ. und A. v. , 2, 34 (1906); 3, 55 (1907). , 20, Vegesack: Zeit. f. 481-512 (1910). 33 127-169 (1907). phys. Chemie, 68, 357-382 (1909); 73, CHEMISTRY OF COLLOIDS 34 Dialysis and Ultrafiltration The property of plant, animal or artificial membranes to prevent from passing through them has made two very important methods of separation possible. The first one, dialysis, which Graham used with such notable results, has already been spoken of.

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