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Title: Particle entrainment in dead-end pores by diffusiophoresis

Abstract

The transport of particulate matter to and from dead-end pores is difficult to achieve due to confinement effects. Diffusiophoresis is a phenomenon that results in the controlled motion of colloids along solute concentration gradients. Thus, by establishing an electrolyte concentration gradient within dead-end pores, it is possible to induce the flow of particles into and out of the pores via diffusiophoresis, as has been demonstrated recently. In this paper, we explain the pore-scale mechanism by which individual colloids are entrained in dead-end pores by diffusiophoresis. We flow particles past a series of dead-end pores in the presence of a solute concentration gradient. Our results reveal that particles execute pore-to-pore hops before ultimately being captured. We categorize an event as particle capture when the particle's trajectory terminates within the dead-end pore. Experiments and numerical simulations demonstrate that particle capture only occurs when flowing particles are positioned sufficiently close to the pore entry. Outside this capture region, the particles have insufficient diffusiophoretic velocities to induce capture and their dynamics are largely dominated by their free-stream advective velocities. We observe that the particles move closer to the device wall as they hop, thereby reducing the effect of flow advection and increasing that ofmore » diffusiophoresis. These results enhance our understanding of suspension dynamics in a driven system and have implications for the development, design, and optimization of diffusiophoretic platforms for drug delivery, cosmetics, and material recovery.« less

Authors:
 [1]; ORCiD logo [2];  [3];  [4];  [5]
  1. Harvard University
  2. ORNL
  3. University of Hawaii at Manoa, Honolulu
  4. Imperial College London
  5. Princeton University
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1550745
Alternate Identifier(s):
OSTI ID: 1508874
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Soft Matter
Additional Journal Information:
Journal Volume: 15; Journal Issue: n/a
Country of Publication:
United States
Language:
English

Citation Formats

Battat, Sarah, Ault, Jesse T., Shin, Sangwoo, Khodaparast, Sepideh, and Stone, Howard. Particle entrainment in dead-end pores by diffusiophoresis. United States: N. p., 2019. Web. doi:10.1039/C9SM00427K.
Battat, Sarah, Ault, Jesse T., Shin, Sangwoo, Khodaparast, Sepideh, & Stone, Howard. Particle entrainment in dead-end pores by diffusiophoresis. United States. doi:10.1039/C9SM00427K.
Battat, Sarah, Ault, Jesse T., Shin, Sangwoo, Khodaparast, Sepideh, and Stone, Howard. Mon . "Particle entrainment in dead-end pores by diffusiophoresis". United States. doi:10.1039/C9SM00427K.
@article{osti_1550745,
title = {Particle entrainment in dead-end pores by diffusiophoresis},
author = {Battat, Sarah and Ault, Jesse T. and Shin, Sangwoo and Khodaparast, Sepideh and Stone, Howard},
abstractNote = {The transport of particulate matter to and from dead-end pores is difficult to achieve due to confinement effects. Diffusiophoresis is a phenomenon that results in the controlled motion of colloids along solute concentration gradients. Thus, by establishing an electrolyte concentration gradient within dead-end pores, it is possible to induce the flow of particles into and out of the pores via diffusiophoresis, as has been demonstrated recently. In this paper, we explain the pore-scale mechanism by which individual colloids are entrained in dead-end pores by diffusiophoresis. We flow particles past a series of dead-end pores in the presence of a solute concentration gradient. Our results reveal that particles execute pore-to-pore hops before ultimately being captured. We categorize an event as particle capture when the particle's trajectory terminates within the dead-end pore. Experiments and numerical simulations demonstrate that particle capture only occurs when flowing particles are positioned sufficiently close to the pore entry. Outside this capture region, the particles have insufficient diffusiophoretic velocities to induce capture and their dynamics are largely dominated by their free-stream advective velocities. We observe that the particles move closer to the device wall as they hop, thereby reducing the effect of flow advection and increasing that of diffusiophoresis. These results enhance our understanding of suspension dynamics in a driven system and have implications for the development, design, and optimization of diffusiophoretic platforms for drug delivery, cosmetics, and material recovery.},
doi = {10.1039/C9SM00427K},
journal = {Soft Matter},
number = n/a,
volume = 15,
place = {United States},
year = {2019},
month = {4}
}

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This content will become publicly available on April 1, 2020
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