Viscoelastic properties of monodisperse spherical silica suspension
来源期刊：中南大学学报(英文版)2007年第6期
论文作者：伍秋美 阮建明 黄伯云 周忠诚 邹俭鹏
文章页码：737 - 737
Key words：viscoelasticity; monodisperse silica; suspension; shear thickening
Abstract: The viscoelastic properties of the suspension of monodisperse spherical silica produced by hydrolysis of tetraethoxysilane in alcohol solvent with ammonia as a catalyst in polyethylene glycol (PEG) were studied. The results show that the SiO2/PEG suspension possesses the reversible shear thinning and shear thickening behaviors. In the shear thinning region, the loss modulus (G″) almost remains unchanged, whereas the storage modulus (G′) decreases. In the shear thickening region, G″ and G′ increase for the formation of the “clusters”. The larger G″ over G′ in all the stress studied shows that the system mainly possesses the viscous property, and that the energy dissipated(Ed) is larger than that stored. Ed of this suspension is proportional to the maximum strain (γmax) rising with the exponent of 1.92 under low shear stress; however, in the shear thickening region, Ed is proportional to γmax rising with the exponent of 5.00.
基金信息：the National Natural Science Foundation of China
