Isa Lucio, Besseling Rut, Morozov Alexander N, Poon Wilson C K
SUPA, School of Physics & Astronomy, The University of Edinburgh, James Clerk Maxwell Building, The Kings Buildings, Mayfield Road, Edinburgh EH9 3JZ, United Kingdom.
Phys Rev Lett. 2009 Feb 6;102(5):058302. doi: 10.1103/PhysRevLett.102.058302. Epub 2009 Feb 4.
We study the pressure-driven flow of concentrated colloids confined in glass microchannels at the single-particle level using fast confocal microscopy. For channel to particle size ratios 2a/D[over ] less, similar30, the flow rate of the suspended particles shows fluctuations. These turn into regular oscillations for higher confinements (2a/D[over ] approximately 20). We present evidence to link these oscillations with the relative flow of solvent and particles (permeation) and the effect of confinement on shear thickening.
我们使用快速共聚焦显微镜在单粒子水平上研究了限制在玻璃微通道中的浓缩胶体的压力驱动流动。对于通道与粒子尺寸比2a/D小于约30的情况，悬浮粒子的流速会出现波动。在更高的限制条件下（2a/D约为20），这些波动会转变为规则振荡。我们提供证据将这些振荡与溶剂和粒子的相对流动（渗透）以及限制对剪切增稠的影响联系起来。
