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(a) Scanning electron microscope image of mesoporous silica nanospheres showing the formation of monodisperse, water-dispersable nanoparticles. (b) Schematic showing the Gd-(trimethoxysilylpropyl)diethylenetriamine tetraacetate (Gd-Si-DTTA) complexes residing in hexagonally ordered nanochannels of ∼2.4 nm in diameter.51
