A Dual pH- and Light-Responsive Spiropyran-Based Surfactant: Investigations on Its Switching Behavior and Remote Control over Emulsion Stability.

Autor: Reifarth M; University of Potsdam, Institute of Chemistry, Karl-Liebknecht-Straße 24-25, 14476, Potsdam, Germany.; Fraunhofer Institute for Applied Polymer Research (IAP), Geiselbergstraße 69, 14476, Potsdam, Germany., Bekir M; University of Potsdam, Institute of Physics and Astronomy, Karl-Liebknecht-Straße 24-25, 14476, Potsdam, Germany., Bapolisi AM; University of Potsdam, Institute of Chemistry, Karl-Liebknecht-Straße 24-25, 14476, Potsdam, Germany., Titov E; University of Potsdam, Institute of Chemistry, Karl-Liebknecht-Straße 24-25, 14476, Potsdam, Germany., Nußhardt F; Fraunhofer Institute for Applied Polymer Research (IAP), Geiselbergstraße 69, 14476, Potsdam, Germany., Nowaczyk J; University of Potsdam, Institute of Chemistry, Karl-Liebknecht-Straße 24-25, 14476, Potsdam, Germany.; Fraunhofer Institute for Applied Polymer Research (IAP), Geiselbergstraße 69, 14476, Potsdam, Germany., Grigoriev D; Fraunhofer Institute for Applied Polymer Research (IAP), Geiselbergstraße 69, 14476, Potsdam, Germany., Sharma A; University of Potsdam, Institute of Physics and Astronomy, Karl-Liebknecht-Straße 24-25, 14476, Potsdam, Germany., Saalfrank P; University of Potsdam, Institute of Chemistry, Karl-Liebknecht-Straße 24-25, 14476, Potsdam, Germany., Santer S; University of Potsdam, Institute of Physics and Astronomy, Karl-Liebknecht-Straße 24-25, 14476, Potsdam, Germany., Hartlieb M; University of Potsdam, Institute of Chemistry, Karl-Liebknecht-Straße 24-25, 14476, Potsdam, Germany.; Fraunhofer Institute for Applied Polymer Research (IAP), Geiselbergstraße 69, 14476, Potsdam, Germany., Böker A; University of Potsdam, Institute of Chemistry, Karl-Liebknecht-Straße 24-25, 14476, Potsdam, Germany.; Fraunhofer Institute for Applied Polymer Research (IAP), Geiselbergstraße 69, 14476, Potsdam, Germany.
Jazyk: angličtina
Zdroj: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2022 May 16; Vol. 61 (21), pp. e202114687. Date of Electronic Publication: 2022 Mar 23.
DOI: 10.1002/anie.202114687
Abstrakt: A cationic surfactant containing a spiropyran unit is prepared exhibiting a dual-responsive adjustability of its surface-active characteristics. The switching mechanism of the system relies on the reversible conversion of the non-ionic spiropyran (SP) to a zwitterionic merocyanine (MC) and can be controlled by adjusting the pH value and via light, resulting in a pH-dependent photoactivity: While the compound possesses a pronounced difference in surface activity between both forms under acidic conditions, this behavior is suppressed at a neutral pH level. The underlying switching processes are investigated in detail, and a thermodynamic explanation based on a combination of theoretical and experimental results is provided. This complex stimuli-responsive behavior enables remote-control of colloidal systems. To demonstrate its applicability, the surfactant is utilized for the pH-dependent manipulation of oil-in-water emulsions.
(© 2022 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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