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Communication: Light driven remote control of microgels’ size in the presence of photosensitive surfactant: Complete phase diagram

Schimka, Selina ; Gordievskaya, Yulia D. ; Lomadze, Nino ; Lehmann, Maren ; Klitzing, Regine von ; Rumyantsev, Artem M. ; Kramarenko, Elena Yu. ; Santer, Svetlana (2022):
Communication: Light driven remote control of microgels’ size in the presence of photosensitive surfactant: Complete phase diagram. (Publisher's Version)
In: The Journal of Chemical Physics, 147 (3), AIP Publishing, ISSN 0021-9606, e-ISSN 1089-7690,
DOI: 10.26083/tuprints-00022936,
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Item Type: Article
Origin: Secondary publication service
Status: Publisher's Version
Title: Communication: Light driven remote control of microgels’ size in the presence of photosensitive surfactant: Complete phase diagram
Language: English
Abstract:

Here we report on a light triggered remote control of microgel size in the presence of photosensitive surfactant. The hydrophobic tail of the cationic surfactant contains azobenzene group that undergoes a reversible photo-isomerization reaction from a trans- to a cis-state accompanied by a change in the hydrophobicity of the surfactant. We have investigated light assisted behaviour and the complex formation of the microgels with azobenzene containing surfactant over the broad concentrational range starting far below and exceeding several times of the critical micelle concentration (CMC). At small surfactant concentration in solution (far below CMC), the surfactant in the trans-state accommodates within the microgel causing its compaction, while the cis-isomer desorbs out of microgel resulting in its swelling. The process of the microgel size change can be described as swelling on UV irradiation (trans-cis isomerization) and shrinking on irradiation with blue light (cis-trans isomerization). However, at the surfactant concentrations larger than CMC, the opposite behaviour is observed: the microgel swells on blue irradiation and shrinks during exposure to UV light. We explain this behaviour theoretically taking into account isomer dependent micellization of surfactant within the microgels.

Journal or Publication Title: The Journal of Chemical Physics
Volume of the journal: 147
Issue Number: 3
Place of Publication: Darmstadt
Publisher: AIP Publishing
Collation: 5 Seiten
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Divisions: Profile Areas > Thermo-Fluids & Interfaces
05 Department of Physics > Institute for Condensed Matter Physics
Date Deposited: 28 Nov 2022 13:58
Last Modified: 28 Nov 2022 13:58
DOI: 10.26083/tuprints-00022936
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-229362
Additional Information:

Supplementary material: Video of the reversibly swelling microgel: https://t1p.de/enm4l

URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/22936
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