Chen Kevin, Wu Bin, He Lilin, Smith Gregory S, Do Changwoo, Huang Guan-Rong, Zhang Gaibo, Wang Yangyang
Centre for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
Phys Chem Chem Phys. 2018 Feb 28;20(9):6050-6054. doi: 10.1039/c7cp07197c.
Recent computational and theoretical studies have shown that the deformation of colloidal suspensions under a steady shear is highly heterogeneous at the particle level and demonstrate a critical influence on the macroscopic deformation behavior. Despite its relevance to a wide variety of industrial applications of colloidal suspensions, scattering studies focusing on addressing the heterogeneity of the non-equilibrium colloidal structure are scarce thus far. Here, we report the first experimental result using small-angle neutron scattering. From the evolution of strain heterogeneity, we conclude that the shear-induced deformation transforms from nearly affine behavior at low shear rates, to plastic rearrangements when the shear rate is high.
最近的计算和理论研究表明，胶体悬浮液在稳定剪切作用下的变形在颗粒层面上具有高度的不均匀性，并对宏观变形行为产生关键影响。尽管这与胶体悬浮液在众多工业应用中的相关性有关，但迄今为止，专注于解决非平衡胶体结构不均匀性的散射研究却很少。在此，我们报告了首次使用小角中子散射的实验结果。从应变不均匀性的演变来看，我们得出结论，剪切诱导的变形从低剪切速率下的近乎仿射行为转变为高剪切速率下的塑性重排。
