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31 December 2024 Optical trapping of flow tracers for the characterization of thermo-osmotic slip flows around charged microparticles
T. Tsuji, S. Mei, S. Taguchi
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Proceedings Volume 13487, Optics and Photonics International Congress 2024; 134870F (2024) https://doi.org/10.1117/12.3027244
Event: Optics and Photonics International Congress, 2024, Yokohama, Japan
Abstract
In this paper, we report a novel application of the optical trapping of tracers (e.g., micro- or nanoscale particles) to investigate experimentally a microscale fluid flow induced around a microparticle. In particular, we focus on the thermoosmotic slip flows around a target microparticle fixed on a microchannel. The thermo-osmotic slip flows are creeping fluid flows near a solid surface induced by a temperature gradient of the fluid along the surfaces. By confining optically the tracer motions in a circular path around the circumference of a target microparticle immersed in a fluid with an inhomogeneous temperature field, we successfully visualize the flows induced around the target particle along its surface in a direction from the cold to the hot side. It is found that the magnitude of the observed creeping flow depends on the zeta potential of the target microparticles, i.e., the surface charge.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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T. Tsuji, S. Mei, and S. Taguchi "Optical trapping of flow tracers for the characterization of thermo-osmotic slip flows around charged microparticles", Proc. SPIE 13487, Optics and Photonics International Congress 2024, 134870F (31 December 2024); https://doi.org/10.1117/12.3027244
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KEYWORDS
Microfluidics
Optical tweezers
Visualization
Colloids
Fluid dynamics
Thermal effects
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