Method for preparing SiO2 nanoparticle shearing and thickening fluid on basis of surface modification and etching

Abstract

The invention discloses a method for preparing a SiO2 nanoparticle shearing and thickening fluid on the basis of surface modification and etching. The method comprises the following steps: 1) preparing SiO2 nanoparticles of which the particle size is 20-500nm and the surface is etched; 2) putting the SiO2 nanoparticles obtained in the step 1) into a mixed liquid, uniformly dispersing the SiO2 nanoparticles through mechanical stirring, grinding and ultrasonic equipment so as to obtain a suspension; 3) drying volatile components in the suspension obtained in the step 2), so as to obtain a fluid,namely a SiO2 shearing and thickening fluid. The method is simple in process, good in operability, stable in product property, small in waste emission and applicable to industrial production, the SiO2 nanoparticles synthesized by using the method are good in dispersibility, uniform in particle size distribution and free of aggregation, the shearing and thickening fluid prepared from the SiO2 nanoparticles synthesized by using the method has the characteristics of being large in critical shearing velocity, large in viscosity and yield stress after thickening, large in damping coefficient, andthe like, and is applicable to application requirements of fields such as individual protection, armor protection and damping and noise reduction.

Description

technical field [0001] The present invention relates to SiO 2 Synthesis, surface modification and etching of nanoparticles, SiO 2 The field of nanoparticle application technology mainly involves a monodisperse non-agglomerated SiO 2 Synthesis, surface modification and etching of nanoparticles and based on this SiO 2 Preparation method of shear thickening fluid, specifically a SiO2 based on surface modification and etching 2 Preparation method of nanoparticle shear thickening fluid. Background technique [0002] A shear thickening fluid is one in which the viscosity of the fluid increases as the shear rate increases. This characteristic makes the shear thickening fluid have a wide range of applications, such as personal protection, armor protection, damping and shock absorption, sound insulation and noise reduction, and building shock resistance. With the deepening of the study on the fluid shear thickening effect, a series of shear thickening fluids have been prepared, ...

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