Gehin Cécile, Persello Jacques, Charraut Daniel, Cabane Bernard
LCMI, Université de Franche Comté, 16 route de Gray, 25030 Besançon, France.
J Colloid Interface Sci. 2004 May 15;273(2):658-67. doi: 10.1016/j.jcis.2004.01.029.
We present experimental and theoretical results on the electrorheological response and microstructure of colloidal suspensions composed of silica nanoparticles dispersed in a silicon oil, as a function of electric field strength and silica water content. Using small-angle neutrons scattering experiments, we determined the evolution of the static structure factor of the suspensions when an electric field is applied. Experimental data were fitted with model calculations using the Percus-Yevick solution for Baxter's hard-sphere adhesive potential. The obtained stickiness parameter is directly related to the polarization interactions that depend on the water content of silica particles. The influence of the polarization interparticle potential on the rheology of the silica dispersions was investigated in a second time. A microscopic theory for the shear viscosity of adhesive hard-sphere suspensions was successfully used which describes the steady shear viscosity of suspension in terms of the fractal concept.
我们给出了关于由分散在硅油中的二氧化硅纳米颗粒组成的胶体悬浮液的电流变响应和微观结构的实验和理论结果，该结果是电场强度和二氧化硅含水量的函数。通过小角中子散射实验，我们确定了施加电场时悬浮液静态结构因子的演变。实验数据使用针对巴克斯特硬球粘附势的珀库斯 - 耶维克解进行模型计算拟合。得到的粘性参数与取决于二氧化硅颗粒含水量的极化相互作用直接相关。第二次研究了极化颗粒间势对二氧化硅分散体流变学的影响。成功地使用了一种关于粘附硬球悬浮液剪切粘度的微观理论，该理论根据分形概念描述了悬浮液的稳态剪切粘度。
