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Direct photochromism is observed for the mesostructured host–photochromic guest system reported here. Block-copolymer/silica mesostructures were used as hosts for two photochromic dyes, a spirooxazine and a spiropyran. It is shown that the dyes are incorporated predominantly within the hydrophobic occlusions of the mesostructures (see Figure) and exhibit direct photochromism, with very fast response times.
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Wirnsberger et al. (2000) studied this question.
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