Diffusiophoresis in narrow channel flows

Ault, Jesse T.; Shin, Sangwoo; Stone, Howard A.

doi:10.1017/jfm.2018.618

Diffusiophoresis in narrow channel flows

Journal Article · Mon Sep 10 00:00:00 EDT 2018 · Journal of Fluid Mechanics

DOI:https://doi.org/10.1017/jfm.2018.618· OSTI ID:1470896

^[1]; Shin, Sangwoo ^[2]; Stone, Howard A. ^[3]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Biomedical Sciences, Engineering, and Computing Group
University of Hawaii at Manoa, Honolulu, HI (United States). Department of Mechanical Engineering
Princeton Univ., NJ (United States). Department of Mechanical and Aerospace Engineering

We report that flows containing suspended colloidal particles and dissolved solutes are found in a multitude of natural and man-made systems including hydraulic fractures, water filtration systems and microfluidic devices, e.g. those designed for biological or medical applications. In these types of systems, unexpected particle dynamics such as rapid particle transport and focusing has been observed in the presence of local solute gradients due to the cooperating or competing effects of fluid advection and particle diffusiophoresis, the latter driven by local chemical gradients. We develop analytical expressions for the fluid, solute and particle dynamics in long, narrow channels due to the combined influence of pressure-driven channel flow with diffusiophoretic and diffusioosmotic effects. The results confirm a rapid particle focusing effect that can be controlled by manipulating the particle, solute and flow properties, as well as the channel’s geometry and surface chemistry. Thus, we propose a new approach for performing microfluidic zeta potentiometry, as well as techniques for sorting, concentrating and/or capturing particles based on their sizes or zeta potentials. Lastly, we demonstrate that diffusioosmotic effects can be used to pump fluid against a pressure gradient.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: DOE Office of Science; USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1470896

Journal Information:: Journal of Fluid Mechanics, Journal Name: Journal of Fluid Mechanics Vol. 854; ISSN 0022-1120

Publisher:: Cambridge University PressCopyright Statement

Country of Publication:: United States

Language:: English

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Characterization of surface–solute interactions by diffusioosmosis Ault, Jesse T.; Shin, Sangwoo; Stone, Howard A. Soft Matter, Vol. 15, Issue 7 https://doi.org/10.1039/c8sm01360h	journal	January 2019
Advective-diffusive spreading of diffusiophoretic colloids under transient solute gradients Chu, Henry C. W.; Garoff, Stephen; Tilton, Robert D. Soft Matter, Vol. 16, Issue 1 https://doi.org/10.1039/c9sm01938c	journal	January 2020
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