Unique molecular-recognition microcapsules for environmental stimuli-responsive controlled release have been developed. The microcapsules consist of a core–shell porous membrane. The pores contain linear-grafted poly(NIPAM-co-BCAm) chains, which act as the molecular-recognition gates. The Figure shows the mechanism of the opening of the pores to release the molecules inside.
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Chu et al. (2002) studied this question.