Self-assembly, hydration, and structures in N-decanoyl- N-methylglucamide aqueous solutions: Effect of salt addition and temperature

The influence of NaCl addition and temperature on the self-assembly, hydration, and structures of N-decanoyl- N-methylglucamide (MEGA-10) in dilute solution has been investigated by using several experimental techniques, including tensiometry, steady-state fluorescence, density, viscosity, and stati...

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Bibliographic Details
Published in:Journal of colloid and interface science 2007-09, Vol.313 (2), p.656-664
Main Authors: Molina-Bolívar, J.A., Hierrezuelo, J.M., Carnero Ruiz, C.
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Electrolytes - chemistry
Exact sciences and technology
Fatty Acids - chemistry
General and physical chemistry
Glucosamine - analogs & derivatives
Glucosamine - chemistry
Hydration
MEGA-10
Micelles
Micelles. Thin films
Micellization
Sodium Chloride - chemistry
Structure
Surface activity
Surface physical chemistry
Surface-Active Agents - chemistry
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Summary:The influence of NaCl addition and temperature on the self-assembly, hydration, and structures of N-decanoyl- N-methylglucamide (MEGA-10) in dilute solution has been investigated by using several experimental techniques, including tensiometry, steady-state fluorescence, density, viscosity, and static and dynamic light scattering. Tensiometry and fluorescence probe studies, by using pyrene as a probe, were used to obtain the critical micelle concentration (cmc) upon the electrolyte addition. The mean micellar aggregation numbers ( N agg ) as a function of the salt addition were obtained by both static light scattering and static quenching methods. The N agg values estimated by both methods were found to be in good agreement. It was found that the increase in the micelle size, produced by the addition of NaCl, is due to the increase in the aggregation number and in the amount of water non-specifically associated to the micelle. On the other hand, we have observed that the aggregation number remains invariant in the temperature range studied, whereas the hydrodynamic radius slightly decreases. The effect of electrolyte addition and temperature on the properties of MEGA-10 micelles is much less pronounced than those observed in the traditionally used POE-based surfactants.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2007.04.058