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Chiyoung Park, Kyoungho Oh, Sang Cheon Lee and Chulhee Kim Controlled Release of Guest Molecules from Mesoporous Silica Particles Based on a pH-Responsive Polypseudorotaxane Motif Angewandte Chemie International Edition 46

Article first published online: 15 JAN 2007 | DOI: 10.1002/anie.200603404

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Stringing them along: The pores of a mesoporous silica particle were filled with guest molecules and then blocked by threading cyclodextrin molecules (CDs) onto the surface-grafted polyethylenimine (PEI) chains at pH 11. At pH 5.5, the guest molecules can be released from the pores of the particle by reversible dethreading of the CDs from the PEI chains.

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