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Structural Evolution of Oleyl Betainate Aggregates: In Situ Formation of Small Unilamellar Vesicles

Dan Lundberg (Institutionen för kemi- och bioteknik, Teknisk ytkemi) ; M. Almgren ; Patrik Jarvoll (Institutionen för kemi- och bioteknik) ; G. Karlsson
Langmuir (0743-7463). Vol. 26 (2010), 11, p. 7996-8001.
[Artikel, refereegranskad vetenskaplig]

Betaine esters prepared from long-chain alcohols are a class of hydrolyzable cationic surfactants that is interesting both because the compounds can be designed to give harmless products on degradation and that the hydrolysis products can induce potentially useful changes in the properties of systems where such surfactants are present. In this work, the evolution in structure of aggregates formed by oleyl betainate during hydrolysis of the compound has been investigated using H-1 NMR and cryo-transmission electron microscopy (cryo-TEM). With an increasing extent of hydrolysis, and thus an increasing fraction of oleyl alcohol in the aggregates, the aggregate structure changes in a sequence consistent with an increase in the average packing parameter of the surfactant-alcohol mixture, from spherical micelles, via wormlike micelles, to vesicles. An important result front this work is that it demonstrates a means of in situ production of small unilamellar vesicles with a rather narrow size distribution.

Nyckelord: Long-chain alcohols, electron-microscopy, dodecyl betainate, micellar, systems, aqueous-solution, deuterium oxide, methyl-ester, hydrolysis, surfactant, binding



Denna post skapades 2010-06-17.
CPL Pubid: 122893

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Teknisk ytkemi (2005-2014)
Institutionen för kemi- och bioteknik (2005-2014)

Ämnesområden

Kemi

Chalmers infrastruktur