Showing papers by "Dennis C. Prieve published in 1984"
TL;DR: In this article, a rigid colloidal particle is placed in a solution which is not uniform in the concentration of some solute that interacts with the particle, the particle will be propelled in the direction of higher or lower concentration of the solute.
Abstract: When a rigid colloidal particle is placed in a solution which is not uniform in the concentration of some solute that interacts with the particle, the particle will be propelled in the direction of higher or lower concentration of the solute. The resulting locomotion is called diffusiophoresis. Experimental observations and theoretical predictions of the migration velocity of hydrosoIs are reviewed. Present commercial applications include the formation of rubber gloves and the deposition of paint films onto a steel surface. New applications to the analysis of colloidal mixtures and solid-liquid separation are suggested.
133 citations
TL;DR: In this paper, a single 200μm particle is injected into a 0.25% w/w solution of a commercial polyisobutylene (Mv=1.5×106) in a polybutene solvent, held between a plate and a 21 cm disc.
Abstract: A single 200‐μm particle is injected into a 0.25% w/w solution of a commercial polyisobutylene (Mv=1.5×106) in a polybutene solvent, held between a plate and a 21‐cm disc. When rotation of the disc at 5.7 rpm is begun with a disc‐plate separation of 5.4 mm, the particle initially located at a distance r 5.1 cm migrates away from the axis with about the same speed. This sharp reversal in the direction of migration with such a small change in the initial location is not expected on the basis of any current theory. Increasing the rate of rotation or decreasing the disc‐plate separation increases this critical r for reversal, while doubling the particle radius had no significant effect.
12 citations
TL;DR: In this paper, a single polystyrene sphere of radius a, between 141 and 275 micron, when in jected into a disk-plate (torsional) flow of polybutene (viscosity 36 poise, Mn ∼680), migrates radially inward at a rate that is dramatically increased by dissolving 1% of a high-molecular-weight polyisobutylene (Mv ∼106) to make the fluid viscoelastic.
Abstract: A single polystyrene sphere of radius a, between 141 and 275 micron, when in jected into a disk-plate (torsional) flow of polybutene (viscosity 36 poise, Mn ∼680), migrates radially inward at a rate that is dramatically increased by dissolving 1% of a high-molecular-weight polyisobutylene (Mv ∼106) to make the fluid viscoelastic. The torsional flow field was created by rotating a 21-cm-diameter disk at a rate ω of 6–9 rpm with a gap H of 3.7–5.4 mm between this and a ground glass plate with the fluid in the gap. Lateral migration toward a lower shear rate increased with increasing shear rate and with increasing shear rate gradient in the manner predicted by Brunn (1976) or Chan and Leal (1977). Shear rates up to 25 s−1 were investigated. Below a shear rate of 8 s−1 the radial migration velocity is of the form vr = − L(ωa/H)2r, where L is a positive constant containing the fluid properties, and r is the radial position of the particle.
8 citations