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Mesoporous silica nanoparticles combining b) azobenzene moieties A and c) a two-photon fluorophore F. The design of the so-called MAF nanoimpellers allows a two-photon (760 nm) activated release of drug molecules by a) FRET and d) photoisomerisation of azobenzene. e) Nanoimpellers and f) their transmission electron microscopy image.
