A series of shear thickening fluids based on the modified silica nanoparticles by silane coupling agent, stearic acid, and titanate suspended in polyethylene glycol (PEG) were prepared, and the effects of particle modification on the shear thickening behaviors of these fluids were investigated. It can be found that the modification obviously decreases the particle agglomeration, improves the particle dispersion property, and increases the maximum particle concentration in fluid but leads to the reduction of the viscosity and shear thickening effect of the fluids due to the decrease of particle interactions. The modified silica fluids exhibit stronger structural recovery ability and shear thickening reversibility even after multiple shear breakage.

中文翻译：

---

粒子改性对二氧化硅纳米粒子在 PEG 中的悬浮液剪切增稠行为的影响

以硅烷偶联剂、硬脂酸和钛酸酯悬浮在聚乙二醇（PEG）中的改性二氧化硅纳米粒子为基础制备了一系列剪切增稠流体，并研究了粒子改性对这些流体剪切增稠行为的影响。可以发现，改性明显减少了颗粒团聚，改善了颗粒分散性能，提高了流体中的最大颗粒浓度，但由于颗粒相互作用的减少，导致流体的粘度和剪切增稠作用降低。即使经过多次剪切断裂，改性二氧化硅流体仍表现出更强的结构恢复能力和剪切增稠可逆性。