流变学
材料科学
胶体
粒子(生态学)
体积分数
悬挂(拓扑)
复合材料
化学物理
化学工程
化学
海洋学
数学
纯数学
工程类
地质学
同伦
作者
Domenico Truzzolillo,Valentin Roger,Christelle Dupas,Serge Mora,Luca Cipelletti
标识
DOI:10.1088/0953-8984/27/19/194103
摘要
We explore the influence of particle softness and internal structure on both the bulk and interfacial rheological properties of colloidal suspensions. We probe bulk stresses by conventional rheology, by measuring the flow curves, shear stress versus strain rate, for suspensions of soft, deformable microgel particles and suspensions of near hard-sphere-like silica particles. A similar behaviour is seen for both kinds of particles in suspensions at concentrations up to the random close packing volume fraction, in agreement with recent theoretical predictions for sub-micron colloids. Transient interfacial stresses are measured by analyzing the patterns formed by the interface between the suspensions and their solvent, due to a generalized Saffman-Taylor hydrodynamic instability. At odds with the bulk behaviour, we find that microgels and hard particle suspensions exhibit vastly different interfacial stress properties. We propose that this surprising behaviour results mainly from the difference in particle internal structure (polymeric network for microgels versus compact solid for the silica particles), rather than softness alone.
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