Shear thickening (ST) refers to a non-Newtonian behavior of concentrated colloidal suspensions, which exhibits significant viscosity increments at high shear stress or high shear rate. A shear thickening fluid (STF) consists of well-dispersed solid particles in a liquid medium. Silica particles are often used as components of STFs due to the abundance of hydroxyl groups on their surfaces. Polystyrene core-polyacrylamide shell particles (PS-PAAm particles) were prepared to enhance the ST of silica particle-based colloidal suspensions. Addition of PS-PAAm particles to various particle weight fractions of silica particle-based STFs resulted in amplification of ST in all instances. These results suggest that PS-PAAm particles enhance inter-particle interactions due to the abundance of hydrogen-bonding donor groups in polyacrylamide.

中文翻译：

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聚苯乙烯-聚丙烯酰胺颗粒增强硅胶胶体悬浮液的剪切增稠

剪切增稠（ST）是指浓缩胶体悬浮液的非牛顿行为，在高剪切应力或高剪切速率下表现出显着的粘度增加。剪切增稠流体（STF）由分散在液体介质中的固体颗粒组成。二氧化硅颗粒由于其表面上的大量羟基而经常用作STF的组分。制备聚苯乙烯核-聚丙烯酰胺壳颗粒（PS-PAAm颗粒）以增强基于二氧化硅颗粒的胶体悬浮液的ST。在所有情况下，将PS-PAAm颗粒添加到基于二氧化硅颗粒的STF的各种粒径分数中均会导致ST扩增。这些结果表明，由于聚丙烯酰胺中大量的氢键供体基团，PS-PAAm颗粒增强了颗粒间的相互作用。