Bending energetics of tablet-shaped micelles: A novel approach to rationalize micellar systems
2007 (English)In: ChemPhysChem, ISSN 1439-4235, E-ISSN 1439-7641, Vol. 8, no 3, 462-472 p.Article in journal (Refereed) Published
A novel approach to rationalize micellar systems is expounded in which the structural behaviour of tablet-shaped micelles is theoretically investigated as a function of the three bending elasticity constants: spontaneous curvature (H-0), bending rigidity (k(c)), and saddle-splay constant (k(c)). As a result, experimentally accessible micellar properties, such as aggregation number, length-to-width ratio, and polydispersity, may be relation to the different bending elasticity constants. Is it demonstrated that discrete micelles or connected cylinders form when H-0 > 1/4 xi where xi is the thickness of a surfacant monolayer, whereas various bilayer structures are expected to predominate when H-0 > 1/4 xi. Our theory predicts, in agreement with experiments, a transition from discrete globular (tablet-shaped) micelles to a phase of ordered, or disordered, connected cylinders above a critital surfactant concentration. Moreover, a novel explanation for the mechanism of growth, from small globular to long rodlike or wormlike micelles, follows as a consequence from the theory. In accordance, polydiperse elongated micelles (large length-to-width ratio) for as the bending rigidity is lowered, approaching the critical point at k(c) - 0, whereas monodisperse globular micelles (small length-to-width ratio) are expected to be present at larg k(c) values. The spontaneous curvature mainly determines the width of tablet-shaped or ribbonlike micelles, or the radius of dislike micelles, whereas the saddle-splay constant primarily influences the size but not the shape of the micelles.
Place, publisher, year, edition, pages
2007. Vol. 8, no 3, 462-472 p.
aggregation, bending energetics, micelles, surfactants, thermodynamics
IdentifiersURN: urn:nbn:se:uu:diva-145836DOI: 10.1002/cphc.200600692ISI: 000244496200014PubMedID: 17542003OAI: oai:DiVA.org:uu-145836DiVA: diva2:397038