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Effects of ph on foam stability of dimethyldodecylamine oxide and n‐dodecyl‐2‐anninopropionic acid in aqueous solutions
Author(s) -
Tsujii K.,
Arai H.
Publication year - 1978
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02668069
Subject(s) - pulmonary surfactant , aqueous solution , adsorption , chemistry , ionic bonding , ionic strength , oxide , chemical engineering , inorganic chemistry , organic chemistry , ion , biochemistry , engineering
Foam stability of aqueous solutions of dimethyl‐dodecylamine oxide (DMAO) and N‐dodecyl‐2‐aminopropionic acid (DAPA) has been studied in relation to pH by means of the dynamic method. The foam of DMAO solution is stabilized in the acidic pH region, while with the DAPA solution, the foam is stable in either the acidic or basic pH range and unstable between them. The results suggest that the foam stability of the solutions of these two surfactants is governed by the formation of ionic species of the surfactants. It can be presumed that the adsorption of the ionic species of the surfactant molecules at the surface of foam films establishes an electric double‐layer which makes the foams stable.