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Physico-chemical properties of Echo-CNPs. (a) Hydrodynamic size distribution of CNPs, Echo-CNPs, Sonovue® and PFP-GC in distilled water at 25 ºC (b) TEM images of CNPs and Echo-CNPs, and optical images of Sonovue® and PFP-GC (c) Chemical compositions and distributions in the Echo-CNPs analyzed by TEM-EDX. Blue colored PFP was evenly distributed inside the CNP scaffold. O presents hydroxyl group, N presents amine and F presents fluorine.
