Evaluation of alkyl sulfate and sulfonate micellar structure at the water-surfactant interphase with simple geometrical calculations

Giuseppe Del Re; G D'Errico; O Ortona; V Vitagliano

doi:10.1016/j.jcis.2010.05.023

Evaluation of alkyl sulfate and sulfonate micellar structure at the water-surfactant interphase with simple geometrical calculations

J Colloid Interface Sci. 2010 Sep 1;349(1):230-5. doi: 10.1016/j.jcis.2010.05.023. Epub 2010 May 15.

Authors

Giuseppe Del Re¹, G D'Errico, O Ortona, V Vitagliano

Affiliation

¹ Department di Chimica, Complesso Universitario di Montesantangelo, Università degli Studi di Napoli Federico II, Via Cinthia, 80126 Naples (NA), Italy.

PMID: 20609845
DOI: 10.1016/j.jcis.2010.05.023

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.