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(a) SEM (left) and TEM (right) images of typical batches of MSN. The scale bar for SEM is 200 nm and that for TEM is 100 nm. The TEM image shows the hexagonally arranged pore channels. (b) Projection down the pore channels of MSN grafted with IDA. In the open state, the single tethered IDA is freely swinging and allows access to the pore channels, but the addition of a metal ion creates an inorganic complex tethered at two ends over the pore opening.
