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Analysis of the Influence of Alkyl Polyglycoside Surfactant and Cosolvent Structure on Interfacial Tension in Aqueous Formulations versus n-Octane

Iglauer, S. and Wu, Y. and Shuler, P. and Tang, Y. and Goddard, William A., III (2010) Analysis of the Influence of Alkyl Polyglycoside Surfactant and Cosolvent Structure on Interfacial Tension in Aqueous Formulations versus n-Octane. Tenside Surfactants Detergents, 47 (2). pp. 87-97. ISSN 0932-3414. http://resolver.caltech.edu/CaltechAUTHORS:20100610-095743058

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Abstract

We studied the influence of molecular structural elements of alkyl polyglycoside (APG) surfactants on the interfacial tension (IFT) in aqueous formulations against n-octane. This included the analysis of alkyl and aryl chain length, type and number of sugar-ring head, anomers, addition of cosolvents and effect of salt addition. We found that longer alkyl or aryl chains lead to lower IFT, consistent with data recorded for commercial (mixed) APGs. APGs with only one sugar-ring head had lower IFT than their analog maltose derivates (two-ring head). Intriguingly the stereochemistry of the sugar head (i.e. galactose versus glucose) and the type of anomer showed a significant influence on IFT. The n-octyl-alpha-D-glucopyranoside anomer had a lower IFT than the corresponding p-anomer. 1-octanol and 1-hexanol were efficient cosolvents consistent with the datasets observed for commercial APGs. Salt addition reduced IFT. Functional groups (aldehyde, amide-methoxy) integrated into the molecular architecture of the APG skeleton were efficient in terms of significantly reducing IFT, suggesting a strategy for the molecular design of advanced APG surfactants. We discuss the results in the context of the hydrophilic-lipophilic deviation (HLD) concept, which we modified so that IFT values are discussed instead of phase behavior.


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Additional Information:© 2010 Carl Hanser Publisher, Munich. Received: 30.09.2009. Revised: 27.11.2009. This research was supported by the Department of Energy (DE-FC26-01B15362). The computational facilities at the MSC used in this work were funded by ARO-DURIP, ONR-DURIP, and the Beckman Institute.
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Funding AgencyGrant Number
Department of EnergyDE-FC26-01B15362
Subject Keywords:Alkyl polyglucoside, cosolvent, interfacial tension, nonionic surfactant, structure-property relation
Record Number:CaltechAUTHORS:20100610-095743058
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20100610-095743058
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18637
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:15 Jul 2010 21:15
Last Modified:26 Dec 2012 12:07

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