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Some effects of urea on surfactant micellization as a function of temperature

1971; Elsevier BV; Volume: 37; Issue: 1 Linguagem: Inglês

10.1016/0021-9797(71)90276-1

1095-7103

John Piercy, Malcolm N. Jones, G. Ibbotson,

Electrostatics and Colloid Interactions

Abstract The critical micelle concentrations (cmc) of sodium n-dodecyl sulphate (NaDS) lithium n-dodecyl sulphate (LiDS) and n-dodecyltrimethylammonium bromide (DTAB) have been measured over a temperature range from 0 to 40°C in 3 M aqueous urea solution by the conductance method, and for NaDS and DTAB by a membrane potential method. An anomalous maximum in the cmc has been found in the region of 10°C for NaDS and LiDS. For NaDS the degree of dissociation of the micelles as determined from the membrane potential measurements also passes through a maximum at 10°C.