PhysRevLett.125.248002.pdf (1.59 MB)
Reversible trapping of colloids in microgrooved channels via diffusiophoresis under steady-state solute gradients
journal contribution
posted on 2020-12-17, 10:18 authored by Naval Singh, Goran VladisavljevicGoran Vladisavljevic, Francois Nadal, Cécile Cottin-Bizonne, Christophe Pirat, Guido BolognesiThe controlled transport of colloids in dead-end structures is a key capability that can enable a
wide range of applications, such as bio-chemical analysis, drug delivery and underground oil recovery.
This letter presents a new trapping mechanism that allows the fast (i.e., within a few minutes) and
reversible accumulation of sub-micron particles within dead-end micro-grooves by means of parallel
streams with different salinity level. For the first time, particle focusing in dead-end structures is
achieved under steady-state gradients. Confocal microscopy analysis and numerical investigations
show that the particles are trapped at a flow recirculation region within the grooves due to a
combination of diffusiophoresis transport and hydrodynamic effects. Counterintuitively, the particle
velocity at the focusing point is not vanishing and, hence, the particles are continuously transported
in and out of the focusing point. The accumulation process is also reversible and one can cyclically
trap and release the colloids by controlling the salt concentration of the streams via a flow switching
valve.
Funding
Particle Filtration and Accumulation by Solute-driven Transport (FAST) for bio-analysis in microfluidic devices
Engineering and Physical Sciences Research Council
Find out more...Tackling Antimicrobial Resistance: An Interdisciplinary Approach
Engineering and Physical Sciences Research Council
Find out more...History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
- Mechanical, Electrical and Manufacturing Engineering
Department
- Chemical Engineering
Published in
Physical Review LettersVolume
125Issue
24Publisher
American Physical SocietyVersion
- VoR (Version of Record)
Rights holder
© The AuthorsPublisher statement
This is an Open Access Article. It is published by the American Physical Society under the Creative Commons Attribution 4.0 International Licence (CC BY 4.0). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/Acceptance date
2020-11-18Publication date
2020-12-11Copyright date
2020ISSN
0031-9007eISSN
1079-7114Publisher version
Language
- en
Depositor
Dr Guido Bolognesi. Deposit date: 18 November 2020Article number
248002Usage metrics
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