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| Determination of the solvation film thickness of dispersed particles with the method of Einstein viscosity equation | |
| 引用本文： | Changsheng Peng Shaoxian Son Shouci Lu. Determination of the solvation film thickness of dispersed particles with the method of Einstein viscosity equation[J]. 北京科技大学学报(英文版), 2005, 12(4): 370-375 |
| 作者姓名： | Changsheng Peng Shaoxian Son Shouci Lu |
| 作者单位： | 1. College of Environmental Science and Engineering, Ocean University of China, Qingdao 266003, China;Instituto de Metalurgia, Universidad Autónoma de San Luis Potosí, Av. Sierra Leona 550, San Luis Potosí, C.P. 78210, Mexico 2. Instituto de Metalurgia, Universidad Autónoma de San Luis Potosí, Av. Sierra Leona 550, San Luis Potosí, C.P. 78210, Mexico 3. Civil and Environmental Engineering School, University of Science and Technology Beijing, Beijing 100083, China |
| 基金项目： | This work is financially supported by the Consejo Nacional de Ciencia y Tecnologia （C0NACyT） of Mexico under the grant #485100-5-38214-U. |
| 摘 要： | The dispersion of a solid particle in a liquid may lead to the formation of solvation film on the particle surface, which can strongly increase the repulsive force between particles and thus strongly affect the stability of dispersions. The solvation film thickness, which varies with the variation of the property of suspension particles and solutions, is one of the most important parameters of the solvation film, and is also one of the most difficult parameters that can be measured accurately. In this paper, a method, based on the Einstein viscosity equation of dispersions, for determining the solvation film thickness of particles is developed. This method was tested on two kinds of silica spherical powders （namely M1 and M2） dispersed in ethyl alcohol, in water, and in a water-ethyl alcohol mixture （1：1 by volume） through measuring the relative viscosity of dispersions of the particles as a function of the volume fraction of the dry particles in the dispersion, and of the specific surface area and the density of the particles. The calculated solvation film thicknesses on M1 are 7.48, 18.65 and 23.74 nm in alcohol, water and the water-ethyl alcohol mixture, 12.41, 12.71 and 13.13 nm on M2 in alcohol, water and the water-ethyl alcohol mixture, respectively. |
| 关 键 词： | 溶剂化物 薄膜厚度 粘性 Einstein方程 粒子表面 稳定性 |
| 收稿时间： | 2004-10-10 |
Determination of the solvation film thickness of dispersed particles with the method of Einstein viscosity equation |
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| Changsheng Peng,Shaoxian Song,Shouci Lu. Determination of the solvation film thickness of dispersed particles with the method of Einstein viscosity equation[J]. Journal of University of Science and Technology Beijing, 2005, 12(4): 370-375 | |
| Authors: | Changsheng Peng Shaoxian Song Shouci Lu |
| Abstract: | The dispersion of a solid particle in a liquid may lead to the formation of solvation film onthe particle surface, which can strongly increase the repulsive force between particles and thus strongly affect the stability of dispersions. The solvation film thickness, which varies with the variation of the property of suspension particles and solutions, is one of the most important parameters of the solvation film, and is also one of the most difficult parameters that can be measured accurately. In this paper, a method, based on the Einstein viscosity equation of dispersions, for determining the solvation film thickness of particles is developed. This method was tested on two kinds of silica spherical powders (namely M1 and M2) dispersed in ethyl alcohol, in water, and in a water-ethyl alcohol mixture (1:1 by volume) through measuring the relative viscosity of dispersions of the particles as a function of the volume fraction of the dry particles in the dispersion, and of the specific surface area and the density of the particles. The calculated solvation film thicknesses on M1 are 7.48, 18.65 and 23.74 nm in alcohol, water and the water-ethyl alcohol mixture, 12.41, 12.71 and 13.13 nm on M2 in alcohol, water and the water-ethyl alcohol mixture, respectively. |
| Keywords: | solvation film viscosity film thickness Einstein viscosity equation |
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