Dispersion of a solid particle in water may lead to the formation of hydration film on the particle surface, which can strongly increase the repulsive force between the particles and thus strongly affect the stability...Dispersion of a solid particle in water may lead to the formation of hydration film on the particle surface, which can strongly increase the repulsive force between the particles and thus strongly affect the stability of dispersions. The hydration film thickness, which varies with the variation of property of suspension particles, is one of the most impor- tant parameters of hydration film, and is also one of the most difficult parameters that can be measured accurately. In this paper, a method, based on force-distance curve of atomic force microscopy, for determining the hydration film thick- ness of particles is developed. The method utilizes the differ- ence of cantilever deflection before, between and after pene- trating the hydration films between tip and sample, which reflect the difference of slope on the force-distance curve. 3 samples, mica, glass and stainless steel, were used for hydra- tion thickness determination, and the results show that the hydration film thickness between silicon tip and mica, glass and stainless steel are 30.0±2.0, 29.0±1.0 and 32.5±2.5 nm, respectively.展开更多
文摘Dispersion of a solid particle in water may lead to the formation of hydration film on the particle surface, which can strongly increase the repulsive force between the particles and thus strongly affect the stability of dispersions. The hydration film thickness, which varies with the variation of property of suspension particles, is one of the most impor- tant parameters of hydration film, and is also one of the most difficult parameters that can be measured accurately. In this paper, a method, based on force-distance curve of atomic force microscopy, for determining the hydration film thick- ness of particles is developed. The method utilizes the differ- ence of cantilever deflection before, between and after pene- trating the hydration films between tip and sample, which reflect the difference of slope on the force-distance curve. 3 samples, mica, glass and stainless steel, were used for hydra- tion thickness determination, and the results show that the hydration film thickness between silicon tip and mica, glass and stainless steel are 30.0±2.0, 29.0±1.0 and 32.5±2.5 nm, respectively.
