Abstract
Abstract A quantitative theory is developed for the kinetics of a coagulation at surfaces or interfaces. It is tested on aqueous colloidal solutions of hydrophobic particles coagulated by bubbling N2 through them. The theory is found to satisfy the experimental data quantitatively. An additional successful test is carried out on the same sols coagulating, in almost complete absence of turbulence, in rotating circular tubes under maintenance of a quasi stationary twin liquid meniseus against air. The sols used exhibited, if left standing quietly, a “shelflife”, without noticeable coagulum formation, in excess of several years.
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