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A periodically ordered interconnecting porous structure could be imprinted in thermosensitive hydrogels by using silica colloidal crystals as mesoscopically sized templates. The interconnecting porous structure provides a fast response to the change in temperature for reversible swelling and shrinking of the hydrogels, while the periodically ordered mesoscopical structure endows a structural color to the gel. The structural color imprinted in the gel is quickly synchronized with the change in the volume of the gels. The newly invented mesoporous hydrogels possess optical properties as temperature sensitive smart gels.
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Takeoka et al. (2002) studied this question.
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