The surface characteristic of suspended nanoparticle is an extremely important property for the non-Newtonian behavior of shear thickening suspensions. Easy access to distinct surface characteristics and a deep understanding of the role of friction and adhesion forces remains challenging yet critical to study the suspension performance. In this work, by synthesizing mesoporous silica with different surface roughness and groups, the influence of surface characteristics on the non-Newtonian behavior of suspension is comprehensively explored. The results show that the suspensions containing particles with rough surface and hydroxyl groups on the surface have higher shear thickening power, lower critical shear rate, lower discontinuous shear thickening transition fraction and lower jamming fraction. Furthermore, the test of the first normal stress difference shows that the interparticle friction and adhesion both reduce the critical volume fraction of the transition from fluid lubrication dominance to frictional contact dominance in the suspension. This finding deepens the understanding of phase transformation mechanism, and open an approach to accelerate the advanced shear thickening suspensions design for next-generation intelligent materials.

中文翻译：

---

探讨剪切增稠悬浮液中悬浮纳米颗粒表面特性的作用

悬浮纳米粒子的表面特性对于剪切增稠悬浮液的非牛顿行为来说是极其重要的特性。轻松获得不同的表面特征以及深入了解摩擦力和粘附力的作用对于研究悬架性能仍然具有挑战性但至关重要。本工作通过合成不同表面粗糙度和基团的介孔二氧化硅，综合探讨了表面特性对悬浮液非牛顿行为的影响。结果表明，含有粗糙表面和表面羟基颗粒的悬浮液具有较高的剪切增稠能力、较低的临界剪切速率、较低的不连续剪切增稠转变分数和较低的堵塞分数。此外，第一法向应力差的测试表明，颗粒间摩擦和粘附均降低了悬浮液中从流体润滑主导向摩擦接触主导转变的临界体积分数。这一发现加深了对相变机制的理解，并为加速下一代智能材料的先进剪切增稠悬浮液设计开辟了道路。