The water‐holding capacity of ctab‐naphthol foams

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Abstract
The foaming ability of dilute aqueous cetyltrimethylammonium salts is retained in the presence of equimolar amounts of naphthol, while the rate of drainage of the foam under gravity is greatly reduced. A quantitative description is given of the phenomenon, which is explained by the gel‐like nature of the solutions. The foam density is greater in tap water than in distilled water attributable to the sulphate content of the former. Increase in NaCl concentration in the water up to 200 p.p.m. increases the foam density.

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