Abstract
The shear-induced migration of colloidal particles in capillary flow has been investigated using nuclear magnetic resonance. Nuclear magnetic resonance methods have the ability to measure spatially resolved velocity and probability distributions of displacement within a multiphase colloidal system. For a suspension of ∼2.49 μm Brownian model hard spheres under shear flow in a 1 mm diameter glass capillary, particle migration inward to the capillary center was found using spectrally resolved pulsed gradient spin echo techniques for a range of volume fractions. Particle migration was detected even in the dilute regime, down to ϕ<0.04. While particle migration has been measured and is expected in concentrated and noncolloidal suspensions, it has only recently been unequivocally detected in dilute Brownian suspensions.
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