Study on nano-Al2O3 modified by supercritical fluid

Nano-Al2O3 was modified by supercritical ethanol and supercritical water, respectively. The mechanism between supercritical fluid and nano-Al2O3 was analyzed, and the microstructure of nano-Al2O3 was investigated. The mechanism between supercritical fluid and nano-Al2O3 was that the hydrogen bond between the molecules of fluid became attenuating, when the fluid was in the supercritical state. The surface of nano-Al2O3 was coated with fluid molecules through the bonding between the hydroxyl of nano-Al2O3 and fluid molecules. The effect of surface modification of nano-Al2O3 was the best when the nano-Al2O3 was modified by supercritical ethanol and the processing time was 5min.