title: Evaluation of alkyl sulfate and sulfonate micellar structure at the water-surfactant interphase with simple geometrical calculations.
abstract: The present work deals with an interpretation of the differences in micellar structure of two surfactants, sodium decyl sulfonate and sodium decyl sulfate, whose only difference in molecular structure is the presence, for sulfate, of an oxygen atom bridging alkyl chains from a common SO(3)(-) charged head group. Using a simple geometrical approach, a different exposure of the surfactant head groups on the micellar surface is proposed. It is also shown that the different interphase microstructure could be the reason that decyl sulfate forms ellipsoidal aggregates, in contrast to decyl sulfonate, which forms nearly spherical micelles.
authors.affiliation: Department di Chimica, Complesso Universitario di Montesantangelo, Università degli Studi di Napoli Federico II, Via Cinthia, 80126 Naples (NA), Italy.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Del Re
authors.forename: G
authors.initials: G
authors.lastname: D'Errico
authors.forename: O
authors.initials: O
authors.lastname: Ortona
authors.forename: V
authors.initials: V
authors.lastname: Vitagliano