A photo- and thermoresponsive physical gel has been developed based on crosslinked supramolecular polymer networks. The gel shows reversible sol–gel phase transitions induced by heat or light irradiation. The photoinduced sol–gel phase transition shown in the figure results from the cis–trans photoisomerization of an azobenzene group present in the crosslinker.
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Suzuki et al. (2006) studied this question.
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