Issue 23, 2012
From the journal:

Nanoscale

Size-selective pH-operated megagates on mesoporous silica materials†

Min Xue,a   Dennis Cao,bc   J. Fraser Stoddartbc  and  Jeffrey I. Zink*a  

* Corresponding authors

a Department of Chemistry and Biochemistry, and California Nano Systems Institute, University of California, Los Angeles, CA 90095, USA
E-mail: zink@chem.ucla.edu
Fax: +1 310-206-4038

b Center for the Chemistry of Integrated Systems, Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA
E-mail: stoddart@northwestern.edu
Fax: +1 847-491-1009

c NanoCentury KAIST Institute and Graduate School of EEWS (WCU), Korea Advanced Institute of Science and Technology (KAIST), 373-1 Guseong Dong, Yuseong Gu, Daejeon 305-701, Republic of Korea

Abstract

pH-responsive megagates have been fabricated around mesoporous silica material SBA-15 in order to mechanize the mesopores. These megagates remain closed in neutral conditions, but open at pH 5. The capping components of the megagates were designed to be capable of controlling pores up to 6.5 nm in diameter. Selectivity of payloads with different sizes can be achieved through the use of different capping components. The operation of the megagates was demonstrated by time-resolved fluorescence spectroscopy which is capable of monitoring the release of both the payload and the cap. This study opens up new possibilities in the field of controllable release.

Graphical abstract: Size-selective pH-operated megagates on mesoporous silica materials

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Article information

DOI
https://doi.org/10.1039/C2NR32170J
Article type
Paper
Submitted
06 Aug 2012
Accepted
08 Oct 2012
First published
29 Oct 2012

Nanoscale, 2012,4, 7569-7574

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Size-selective pH-operated megagates on mesoporous silica materials

M. Xue, D. Cao, J. F. Stoddart and J. I. Zink, Nanoscale, 2012, 4, 7569 DOI: 10.1039/C2NR32170J

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