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- W2893815943 abstract "The impact of pore geometry and functionality on the dynamics of water nanoconfined in porous media are the subject of some debate. We report the synthesis and small-angle X-ray scattering (SAXS) characterization of a series of perdeuterated gemini surfactant lyotropic liquid crystals (LLCs), in which convex, water-filled nanopores of well-defined dimensions are lined with carboxylate functionalities. Quasielastic neutron scattering (QENS) measurements of the translational water dynamics in these dicarboxylate LLC nanopores as functions of the surfactant hydration state and the charge compensating counterion (Na+, K+, NMe4+) reveal that the measured dynamics depend primarily on surfactant hydration, with an unexpected counterion dependence that varies with hydration number. We rationalize these trends in terms of a balance between counterion–water attractions and the nanopore volume excluded by the counterions. On the basis of electron density maps derived from SAXS analyses of these LLCs, we directly show that the volume excluded by the counterions depends on both their size and spatial distribution in the water-filled channels. The translational water dynamics in the convex pores of these LLCs are also slower than those reported in the concave pores of AOT reverse micelles, implying that water dynamics also depend on the nanopore curvature." @default.
- W2893815943 created "2018-10-05" @default.
- W2893815943 creator A5000808086 @default.
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- W2893815943 creator A5062393684 @default.
- W2893815943 creator A5063043155 @default.
- W2893815943 creator A5079013075 @default.
- W2893815943 date "2018-09-25" @default.
- W2893815943 modified "2023-10-03" @default.
- W2893815943 title "Ion-Specific Confined Water Dynamics in Convex Nanopores of Gemini Surfactant Lyotropic Liquid Crystals" @default.
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- W2893815943 doi "https://doi.org/10.1021/acs.jpcb.8b05942" @default.
- W2893815943 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30251848" @default.
- W2893815943 hasPublicationYear "2018" @default.
- W2893815943 type Work @default.