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Modification of MSNs via (a) surface grafting of carboxylic groups (MSN-COOH) by postsynthetic modification with TESP, (b) coating of PEG and PEI by amidation (c) co-condensation with MPTES leading to MSN-SH. R = −(C3H6)SH and R′ = −(OCH2CH3)3 [69].
