Electrochemical, microscopic, and spectroscopic characterization of prevesicle nanostructures and vesicles on mixed cationic surfactant systems

Langmuir : the ACS Journal of Surfaces and Colloids
Emilio AicartElena Junquera

Abstract

Several experimental techniques (conductivity, zeta potential, transmission electronic microscopy, and steady-state fluorescence spectroscopy) have been used to study the formation of mixed colloidal aggregates consisting of a cationic double-chain surfactant, di-dodecyldimethylammonium bromide (di-C12DMAB), and a single-chain alkyltrimethylammonium bromide with 10 and/or 14 carbon atoms (decyltrimethylammonium bromide, C10TAB, and/or tetradecyltrimethylammonium bromide, C14TAB). Special interest has been devoted to the prevesicle domain, within which the formation of aggregated nanostructures was first reported in our laboratory. For that purpose, studies have been carried out on the very dilute region by means of conductivity experiments, confirming the existence of two critical aggregation concentrations in that concentration domain: the so-called mixed critical aggregate concentration, CAC, and the mixed critical vesicle concentration, CVC. By carrying out TEM experiments on negatively stained samples, we were surprised to find a number of aggregates without a clear aggregation pattern and with a variety of sizes and shapes at concentrations below CAC, where only monomers were expected. However, the nanoaggregates found at ...Continue Reading

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Jul 28, 2004·Langmuir : the ACS Journal of Surfaces and Colloids·Elena JunqueraEmilio Aicart
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Jul 27, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Elena JunqueraEmilio Aicart
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Citations

Aug 28, 2007·Journal of Colloid and Interface Science·Kamalakanta Behera, Siddharth Pandey
Dec 23, 2006·Journal of Colloid and Interface Science·Kamalakanta BeheraSiddharth Pandey
Oct 13, 2007·Physical Review Letters·Aletta A VerhoeffWillem K Kegel
Dec 4, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Wei LiYueju Zhao
Jan 30, 2009·The Journal of Physical Chemistry. B·Ramon Barnadas-Rodríguez, Joan Estelrich
Nov 17, 2006·The Journal of Physical Chemistry. B·Patricia Del BurgoElena Junquera
Jan 29, 2008·The Journal of Physical Chemistry. B·Alberto Rodríguez-PulidoElena Junquera

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