Bioresponsive contrast agents can provide smart signaling in MRI. In wrapping pore functionalised Gd-DOTA mesoporous silica nanoparticles with pH-responsive poly(acrylic acid), exchange between pore and bulk water can be reversibly switched by local pH. The generated high contrast then exhibits a large amplitude switch in a manner relevant to environmentally responsive imaging.
J. Pellico, C. M. Ellis, J. Miller and J. J. Davis, Chem. Commun., 2019, 55, 8540 DOI: 10.1039/C9CC03312B
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