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- W3109151497 abstract "Understanding the physical and chemical mechanisms underlying the interactions between giant micelles and photoswitchable molecules is essential because it is not evident why some photoswitchable chromophores with apparently good potential to modify micellar systems' macroscopic properties have a poor performance on UV-irradiation. We report a mechanism that describes the trans-isomer's expulsion embedded in the wormlike micelles when it is transformed into the cis-isomer on UV-irradiation. Consequently, a small change in the rheological properties of the micellar solution is observed on UV-irradiation. As a model system, 4-(phenylazo)benzoate ion as the photoresponsive chromophore and giant cylindrical micelles made of N-Tetradecyl-N,N-Dimethyl-3-ammonio-1-PropaneSulfonate, and Sodium Dodecyl Sulfate, in saline water, are used. The trans-isomer chromophore incorporates into the micelles modifying the solution viscosity and viscoelastic spectra, which follows the Maxwell model at low and intermediate frequencies. However, the effect of UV-irradiation on rheological properties is not significant. Micro-rheological experiments are performed with diffusive wave spectroscopy to obtain high-frequency viscoelastic spectra to estimate the characteristic length scales of the wormlike micellar network with the embedded chromophore to understand its rheological behavior better. Detailed interaction between the chromophore and the micelles is obtained with 1H-NMR and 1H DOSY NMR experiments to determine the chromophore conformation into the micelles and diffusivity of the isomers." @default.
- W3109151497 created "2020-12-07" @default.
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- W3109151497 date "2021-02-01" @default.
- W3109151497 modified "2023-09-30" @default.
- W3109151497 title "Selective incorporation of one of the isomers of a photoswitchable molecule in wormlike micelles" @default.
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- W3109151497 doi "https://doi.org/10.1016/j.colsurfa.2020.125903" @default.
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