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. Author manuscript; available in PMC: 2014 Jan 8.
Published in final edited form as: Nanoscale. 2012 Dec 7;4(23):10.1039/c2nr32170j. doi: 10.1039/c2nr32170j

Fig. 2.

Fig. 2

(a) The fully extended structure of a megagate incorporating MG-2 as the capping molecule. The dashed circle, the light green ball and the dark green pyramid show the relative sizes of the pore, the dextran cargo, and the fluorescein disodium salt (FDS), respectively. (b) The attachment of cyclodextrin onto the aldehyde-modified silica through imine formation. (c) The operation of a megagate capped by MG-1. The size of MG-1 allows FDS to escape freely from the pore, while dextran is trapped within the pore until the gate is opened by the addition of acid.