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Yuriy Zakrevskyy, Marcel Richter, Svitlana Zakrevska, Nino Lomadze, Regine von Klitzing and Svetlana Santer Light-Controlled Reversible Manipulation of Microgel Particle Size Using Azobenzene-Containing Surfactant Advanced Functional Materials 22

Article first published online: 9 JUL 2012 | DOI: 10.1002/adfm.201200617

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Remote reversible control of swelling/contraction transition of a microgel is realized using azobenzene-containing surfactant. The azobenzene unit is switched between more hydrophilic cis (UV light) and more hydrophobic trans (blue light) state, which alters the surfactant's affinity to the microgel. The trans-surfactant binds to the gel, triggering its contraction, and the cis-surfactant unbinds, leading to microgel swelling.

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