Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session K08: Steerable Particles I: New Ways to Manipulate Fluid-Mediated Forces
3:00 PM–5:36 PM,
Tuesday, March 15, 2022
Room: McCormick Place W-179B
Sponsoring Unit: GSNP
Chair: Yael Roichman, Tel Aviv University
Abstract: K08.00007 : Enhanced colloidal particle trapping in microgrooved channels via diffusiophoresis*
4:36 PM–4:48 PM
(Institut Lumière Matière, CNRS)
(Institut Lumière Matière, UMR5306 Université Claude Bernard Lyon 1 – CNRS, Université de Lyon)
Recently, we demonstrated how solute gradients in steady-state continuous flows past a microgrooved surface can be exploited to induce the controlled and reversible trapping of sub-micron particles within the dead-end grooves. The trapping mechanism is governed by diffusiophoresis, which drives particle motion along a solute gradient.
In this study, we investigate how the particle trapping is affected by the groove geometry, channel surface chemistry and solute gradient intensity, thereby determining the conditions for enhancing the particle trapping performance. The microfluidic devices, featuring a 3-inlet junction for generating the salt gradients, are made of an optical glue (NOA-81) layer, laid on a silicon microgrooved substrate. The proposed approach for particle transport in lab-on-a-chip devices has potential applications in point-of-care, drug delivery and biosensing industry.
*This research was supported by the EPSRC New Investigator Award No. EP/S013865/1.
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