Shear thinning behavior of fume silica suspensions

被引：0

作者：

Lu, Chenglong ^{[1
]}

Peng, Weike ^{[1
]}

Yuan, Wenjie ^{[1
]}

Zhu, Hongxi ^{[1
]}

Li, Jun ^{[1
]}

Deng, Chengji ^{[1
]}

机构：

[1] The State Key Laboratory Breeding Base of Refractories and Ceramics, Wuhan University of Science and Technology

来源：

Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2014年 / 42卷 / 03期

关键词：

Fume silica; Particle aggregation; Rheological behavior; Shear thinning; Suspension;

D O I：

10.7521/j.issn.0454-5648.2014.03.06

中图分类号：

学科分类号：

摘要：

The shear thinning behavior of fume silica suspension was investigated by a coaxial cylinder rheometer. The microstructure of fume silica particles and the phenomenon of particles aggregation were analyzed by transmission electron microscope and scanning electron microscope as well. The shear thinning behavior of fume silica suspension was studied via the decomposition process of agglomerated particles. The agglomeration process follows the Southerland ghost model, and the structure of agglomerated particles is loosen. The loosen structure of agglomerated particles affects the shear thinning behavior of fume silica suspension. The shear thinning behavior of fume silica suspension is correlated to the decomposition process of the aggregates, which follows the Casson model. This process is divided into three stages, i.e., 1) three-dimensional network of suspension is destroyed in the initial stage, resulting in the sharp decrease of the viscosity, and the the particle clusters appear; 2) in the second stage, the clusters break into the particles in the suspension; and 3) the particles fail to further break down in the third stage, leading to a high-speed flow carrying off the water in the particles and a decrease of the viscosity.

引用

页码：296 / 301

页数：5

共 11 条

[1] Lin C.R., Chen W.J., The links-nodes-blobs model for shear-thinning-yield-stress fluids, Colloid Polym Sci, 277, 11, pp. 1019-1025, (1999)
[2] Lodge A.S., A network theory of flow birefringence and stress in concentrated polymer solutions, Trans Faraday Soc, 52, 1, pp. 120-130, (1956)
[3] Satio Y., Ogura H., Otsubo Y., Rheological behavior of silica suspension in aqueous solution of associating polymer, Colloid Polym Sci, 286, 13, pp. 1537-1544, (2008)
[4] Jonthan W.B., Norman J.W., Optical measurement of contributions of colloidal forces to the rheology of concentrated suspension, J Colloid Interface, 172, 1, pp. 171-184, (1995)
[5] Zhang L., Ma T., Yang J., Et al., J Inorg Mater, 19, 5, pp. 1145-1150, (2004)
[6] Zhang L., Rheological behaviors of ceramic suspensions an inhibition of flaws in colloidal formed green bodies, (2005)
[7] Li C., Qiu T., Jiao B., Et al., J Chin Ceram Soc, 33, 3, pp. 287-291, (2005)
[8] Ju C., Wang Y., Ye J., Et al., J Chin Ceram Soc, 34, 8, pp. 985-991, (2006)
[9] pp. 123-125, (2006)
[10] Srinivasa R.R., Sand A.K., Shear-thickening response of fumed silica suspensions under steady and oscillatory shear, J Colloid Interface, 185, 1, pp. 57-67, (1997)

← 1 2 →