含纳米SiO_2的剪切增稠液的制备及其性能的研究

Preparation and Performance Research of Shear Thickening Fluid Containing Nano - SiO_2

通过采用极性溶剂聚乙二醇作为分散介质,构成纳米SiO2分散体系,分散体系在高速冲击下,表观粘度发生巨大的变化,由液相转变成固相,将呈现出很强的抗冲击性能,冲击力消除之后,又迅速从固相转变成液相。在剪切速率比较低的时候,粘度随着剪切速率的增加而减小,在达到最低点(即临界点,对应剪切速率为临界剪切速率)之后,粘度开始急剧增大。

Polar solvent by using polyethylene glycol （peg） as dispersing medium, a nano SiO2 dispersion system, decentralized system under the high speed impact, huge changes in the apparent viscosity, the liquid into a solid phase, would present a strong shock resistance, impact force was removed, and quickly from the solid phase into the liquid phase. When shear rate was low, the viscosity decreased with the increase of shear rate, demand reached a low point in （namely the tipping point, corresponding to the shear rate for the critical shear rate）, viscosity increased sharply.