This work describes X-ray imaging of mouse using a colloid solution of silica-coated Au (Au/SiO2) nanoparticles. A\r\ncolloid solution of Au nanoparticles with a size of 16.9 nm was prepared using hydrogen tetrachloroaurate (III)\r\ntrihydrate as Au source and sodium citrate as reducing reagent. Silica coating of the Au nanoparticles was\r\nperformed by modifying the Au nanoparticle surface with (3-aminopropyl)trimethoxysilane and then by depositing\r\nsilica nuclei generated through a solââ?¬â??gel reaction of tetraethyl orthosilicate in water/ethanol initiated with sodium\r\nhydroxide on the surface-modified surface, which produced Au/SiO2 particles with a size of 136.4 nm. A computed\r\ntomography value of the Au/SiO2 colloid solution with an Au concentration of 0.036 M was as high as 1,184.8\r\nHounsfield units, which was quite higher than that of a commercial X-ray contrast agent with the same iodine\r\nconcentration as the Au concentration. Tissues of mouse could be imaged by injecting the Au/SiO2 particle colloid\r\nsolution into them.
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