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• W1968359145 abstract "Rheological investigations of viscoelastic surfactant solutions, both theoretical and experimental, have primarily focused on anionic or cationic surfactant molecules and charged counterion pairs. In this article, we present an experimental investigation on the linear flow properties (stress relaxation) of uncharged aqueous dimer acid betaine solutions as a function of surfactant and salt concentration. In the zwitterionic dimer acid betaine solutions, the electrostatic interactions among the surfactant molecules are primarily not screened by counterions. As a consequence, the rheological properties are different from charged monomeric surfactant solutions. The analysis of the rheological properties of dimer acid betaine reveals that this surfactant system behaves differently from anionic or cationic compounds. Dimer acid betaine solutions with and without salt do not show monoexponential relaxation phenomena that are typical for kinetically controlled relaxation mechanisms. Introducing NaCl also leads to gel forming and an even higher stability of the aggregates. As a conclusion, the rheological properties such as the zero shear viscosity, relaxation times, or relaxation moduli are mainly controlled by diffusion (reptation) processes. A model for the linear stress decay developed for ionic surfactants was used to characterize basic structural parameters. The aggregation of the surfactant and the structure of the supramolecular aggregates are, however, not completely decoded by the used model showing the complex nature of zwitterionic dimeric surfactant systems." @default.
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• W1968359145 date "2002-09-28" @default.
• W1968359145 modified "2023-09-25" @default.
• W1968359145 title "Linear Flow Properties of Dimer Acid Betaine Solutions with and without Changed Ionic Strength" @default.
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• W1968359145 doi "https://doi.org/10.1021/jp0127263" @default.
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