Dynamic and molecular association in premicellar aqueous solutions of dicarboxylate amino acid-based surfactant as studied by 1 H NMR

We examined a series of amino acid-based surfactants with two carboxylic groups separated by a spacer of one, two, or three carbon atoms with sodium and calcium counterions in the premicellar concentration region near the CMC. H nuclear magnetic resonance (NMR) spectroscopy and NMR diffusometry tech...

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Bibliographic Details
Published in:Magnetic resonance in chemistry 2022-03, Vol.60 (3), p.359-368
Main Authors: Arkhipov, Victor P, Arkhipov, Ruslan V, Filippov, Andrei
Format: Article
Language:English
Subjects:
Amino Acids
Chemistry of Interfaces
Gränsytors kemi
Magnetic Resonance Spectroscopy
Micelles
premicellar aggregation
self-diffusion coefficient
Solutions - chemistry
Surface-Active Agents - chemistry
surfactants
Water - chemistry
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Summary:We examined a series of amino acid-based surfactants with two carboxylic groups separated by a spacer of one, two, or three carbon atoms with sodium and calcium counterions in the premicellar concentration region near the CMC. H nuclear magnetic resonance (NMR) spectroscopy and NMR diffusometry techniques were used to study the local environment, association, and translational dynamics of the surfactant's molecules. We measured the self-diffusion coefficients of the micelles, calculated the effective hydrodynamic radii, and determined the temperature region in which the premicelles exist. With an increase in temperature from 295 to 335 K, the premicellar state of the surfactant is replaced by the monomeric state.
ISSN:0749-1581
1097-458X
1097-458X
DOI:10.1002/mrc.5222