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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: Chapter V. Colloid Chemistry. Harry B. Weiser, Professor of Chemistry, The Rice Institute The following resume deals primarily with the contributions of American chemists to the general theory of colloid chemistry. Since the last survey was written the proceedings of the Fourth National Colloid Symposium held in Cambridge, Mass., June 23- 25 (1926) have been published.1 Special attention is called to these annual volumes which give a detailed account of a number of the important investigations of American workers in this field. Colloidal Solutions. Stability. McBain in "A Survey of the Main Principles of Colloid Science"z gives a comprehensive discussion of the factors influencing the stability of sols under the following headings: Gibbs theorem, conception of oriented and polar groups, solvation, the Helmholtz double layer, the resemblance between sols and electrolytes, the Donnan distribution law, the Hofmeister series. The similarities between sols and electrolytes are stressed as is the importance of the Hofmeister series effects. The universal validity of the Donnan distribution law is pointed out but at the same time, attention is called to the grossly exaggerated claims of Loeb and others as to the part the Donnan equilibrium plays in colloidal behavior. Randall, McBain and White 3 have calculated the activity coefficients of soap solutions. These data furnish further evidence to support the theory that the soaps are colloidal electrolytes which yield micelles in more concentrated solutions. Since recent work of Milner, 4 Debye 5 and others indicates theexistence of a mutual action of ions in solutions, Burton6 is led to assume a similar mutual action of charged particles and an interaction of such colloidal particles and ions in solution. Most writers neglect
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A Survey of American Chemistry
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