title: Studies of the aggregation behavior of cyclic gemini surfactants.
abstract: The specific conductance, surface tension, mean aggregation number, and apparent molar volume properties of aqueous solutions of a novel series of N,N'-bis(cyclododecyldimethyl)-alpha,omega-alkanediammonium dibromide (c12-s-c12) surfactants, where s is the spacer chain length, are reported. Surfactants with s = 3, 4, and 6 have been prepared and characterized in terms of their Krafft temperature (T(Kr)), critical micelle concentration (cmc), surfactant head group area (a) at the air-water interface, mean aggregation number (N(agg)), and the volume change upon micelle formation (deltaV(phi,M)). The c12-3-c12 shows little evidence of aggregate formation, while the results obtained for the c12-4-c12 and c12-6-c12 homologues suggest the formation of small, poorly defined micellar aggregates in aqueous solution.
authors.affiliation: Waters Corporation, 34 Maple Street, Milford, Massachusetts 01757, USA.
authors.forename: K M
authors.initials: KM
authors.lastname: Jenkins
authors.forename: S D
authors.initials: SD
authors.lastname: Wettig
authors.forename: R E
authors.initials: RE
authors.lastname: Verrall