Water Dynamics in Gyroid Phases of Self-Assembled Gemini Surfactants

Santanu Roy, David Skoff, Dominic V. Perroni, Jagannath Mondal, Arun Yethiraj, Mahesh K. Mahanthappa, Martin T. Zanni, James L. Skinner

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Water-mediated ion transport through functional nanoporous materials depends on the dynamics of water confined within a given nanostructured morphology. Here, we investigate H-bonding dynamics of interfacial water within a "normal" (Type I) lyotropic gyroid phase formed by a gemini dicarboxylate surfactant self-assembly using a combination of 2DIR spectroscopy and molecular dynamics simulations. Experiments and simulations demonstrate that water dynamics in the normal gyroid phase is 1 order of magnitude slower than that in bulk water, due to specific interactions between water, the ionic surfactant headgroups, and counterions. Yet, the dynamics of water in the normal gyroid phase are faster than those of water confined in a reverse spherical micelle of a sulfonate surfactant, given that the water pool in the reverse micelle and the water pore in the gyroid phase have roughly the same diameters. This difference in confined water dynamics likely arises from the significantly reduced curvature-induced frustration at the convex interfaces of the normal gyroid, as compared to the concave interfaces of a reverse spherical micelle. These detailed insights into confined water dynamics may guide the future design of artificial membranes that rapidly transport protons and other ions.

Original languageEnglish (US)
Pages (from-to)2472-2475
Number of pages4
JournalJournal of the American Chemical Society
Volume138
Issue number8
DOIs
StatePublished - Mar 2 2016

Bibliographical note

Funding Information:
This work was primarily supported by U.S. Department of Energy (DOE) Grant No. DE-FG02-09ER16110 (S.R. And J.L.S.), and in part by U.S. DOE Grant No. DE-SC0010328 (D.V.P., A.Y., and M.K.M.), and National Science Foundation Grant CHE-0840494 (supporting the computer cluster PHOENIX at Department of Chemistry, UW-Madison, Wisconsin).

Publisher Copyright:
© 2016 American Chemical Society.

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