Dilatant flow of concentrated suspensions of rough particles -: art. no. 268302
Dilatant flow of concentrated suspensions of rough particles -: art. no. 268302
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DOI：
10.1103/physrevlett.95.268302
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发表时间：
2005-12-31
影响因子：
8.6
通讯作者：
Hébraud, P
中科院分区：
文献类型：
--
作者：
Lootens, D;van Damme, H;Hébraud, P
研究了浓缩型胶体悬浮液在干扰转变时的流动各向异性。结果表明，粗糙球形颗粒的使用降低了相邻胶体之间的流体动力润滑力，使应力张量各向异性的研究成为可能。在低剪切速率下，悬浮液在两个相对的表面之间施加吸引力，而在较高剪切速率时，悬浮液变得膨胀。直接共聚焦显微镜观察表明，在高剪切速率下形成了微晶。
The flow anisotropy of a concentrated colloidal suspension at the jamming transition is studied. It is shown that the use of rough spherical particles reduces the hydrodynamic lubrication forces between adjacent colloids and makes possible the study of the stress tensor anisotropy. At low shear rates, the suspension exerts an attractive force between two opposite surfaces, whereas at higher shear rates it becomes dilatant. Direct confocal microscopy observation of the particles organization reveal that crystallites form at high shear rate.