Communication: Light driven remote control of microgels’ size in the presence of photosensitive surfactant: Complete phase diagram
| Autor: | Svetlana Santer, Maren Lehmann, Elena Yu. Kramarenko, Yulia D. Gordievskaya, Artem M. Rumyantsev, Regine von Klitzing, Selina Schimka, Nino Lomadze |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Materials science
Cationic polymerization Institut für Physik und Astronomie General Physics and Astronomy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Chemical engineering Pulmonary surfactant Azobenzene chemistry Critical micelle concentration Polymer chemistry medicine Irradiation Physical and Theoretical Chemistry Swelling medicine.symptom 0210 nano-technology Isomerization Phase diagram |
| Popis: | 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. Published by AIP Publishing. |
| Databáze: | OpenAIRE |
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