Figure 19.
(A) The structure of a weblike megagate using MG-2 as the capping molecule. The relative sizes of the pore (dashed circle), the dextran cargo (the light green ball), and the smaller FDS cargo (the dark green pyramid) are shown. (B) Schematic representation of the cyclodextrin attachment onto the silica modified with aldehyde through imine formation. (C) The capping of megagate by MG-1 prevents the dextran from escaping, while FDS can freely diffuse out from the pore. Addition of acid allows the release of dextran. Reprinted with permission from 61, copyright (2012) Nanoscale.