摘要
Three different spin-lattice relaxation times ( T_1) of water were obtainedin activated alumina-water slurry system, which indicate that there exist three states of water;bound water, pore water and bulk water. The chemical shift (delta_H) decreasesas the amount of wateradded to the system increases due to the differences in contribution of these three states of waterin the samples. The delta_H value for adsorbed water decreases nearly linearly and T_1 increaseswith elevating temperature, whichresult from the decrease in the content of bound water by theincrease in thermal motion.
Three different spin-lattice relaxation times ( T_1) of water were obtainedin activated alumina-water slurry system, which indicate that there exist three states of water;bound water, pore water and bulk water. The chemical shift (delta_H) decreasesas the amount of wateradded to the system increases due to the differences in contribution of these three states of waterin the samples. The delta_H value for adsorbed water decreases nearly linearly and T_1 increaseswith elevating temperature, whichresult from the decrease in the content of bound water by theincrease in thermal motion.
基金
SupportedbytheNationalNaturalScienceFoun dationofChina(20171035)
