A Dual pH- and Light-Responsive Spiropyran-Based Surfactant: Investigations on Its Switching Behavior and Remote Control over Emulsion Stability.
Dual-Responsiveness
Manipulation of Emulsion Stability
Spiropyran Surfactant
Switchable Surfactants
pH-Dependent Photoresponsivity
Journal
Angewandte Chemie (International ed. in English)
ISSN: 1521-3773
Titre abrégé: Angew Chem Int Ed Engl
Pays: Germany
ID NLM: 0370543
Informations de publication
Date de publication:
16 May 2022
16 May 2022
Historique:
received:
01
11
2021
pubmed:
19
2
2022
medline:
19
2
2022
entrez:
18
2
2022
Statut:
ppublish
Résumé
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.
Identifiants
pubmed: 35178847
doi: 10.1002/anie.202114687
pmc: PMC9400902
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e202114687Subventions
Organisme : H2020 European Research Council
ID : 648365
Organisme : Deutsche Forschungsgemeinschaft
ID : 471323994
Organisme : Deutsche Forschungsgemeinschaft
ID : HA 7725/2-1
Organisme : Deutsche Forschungsgemeinschaft
ID : 454020933
Informations de copyright
© 2022 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH.
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