A relationship between foaming and H.L.B. value.
Synopsis The foaming properties of solutions of purified samples of the C(10) to C(18) even-numbered sodium alkyl sulphates in water have been studied using three methods of foam generation. Foam volumes increased with increase in surfactant concentration, and reached a limiting value at the C.M.C. At post-C.M.C. concentrations, foam volumes increased to a maximum with temperature, and then decreased. The point at which the maximum occurred, the maximum foam temperature (M.F.T.), varied from one surfactant to another, but was independent of the experimental method. M.F.T. was inversely proportional to the hydrophile-lipophile balance (H.L.B.) value. The corresponding triethanolamine salts behaved in the same way. Similar results were observed with non-ionics, but the plots of H.L.B. value against M.F.T. were positive.
Badwan
A A
AA
Welsh School of Pharmacy, University of Wales Institute of Science and Technology, King Edward VII Avenue Cardiff CF1 3NU.
Cham
T M
TM
James
K C
KC
Pugh
W J
WJ