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Extra info for A Short Textbook of Colloid Chemistry
Example text
G. STEWART ) that the structure of liquids is rather similar to that of crystals : the molecules in liquids having a tendency to form close-packed, ordered arrangements. These ordered clusters confirm, therefore, the existence of short-range forces in liquids. Each molecule in the inside of a liquid is attracted on all sides to other molecules in its immediate vicinity. Consequently, the forces are balanced. But the behaviour of the molecules near the surface is different, because the forces of attraction now act only from the liquid FIG.
However, since the sulphide particles are very large compared with micromolecular units, the molar concentration, even of this concentrated sol, is very low. FREUNDLICH, indeed, computed the molar concentrations by assuming that the spherical particles have a diameter of 1 0 0 m/x. Such 32 SIMPLE, BASIC EXPERIMENTAL METHODS 8 particles have a ' molecular weight ' of 8-6 . 1 0 , while the molar con5 centration of the 3 0 % arsenious sulphide sol is only 3 - 5 . 1 0 ~ mol. per litre. The density of sols, according to CHOLODNY ( 1 9 0 3 ) increases linearly with the concentration.
In 1 9 0 5 ZSIGMONDY, who investigated many colloids by means of the ultra-microscope, came to the following conclusions : 1. The movement is more vigorous the smaller the particles; 2. The movement does not depend on the direction of the light beam, on the time of illumination, or on the intensity of the light (if the temperature in the solution is kept constant) ; 3 . The movement cannot be explained by changes in concentration caused by evaporation, since observations have been made in completely closed cells ; 4 .