Slipping liquid crystal rotator in viscous fluids

Keita Saito; Yasuyuki Kimura

doi:10.1117/12.3008333

20 September 2023 Slipping liquid crystal rotator in viscous fluids

Keita Saito, Yasuyuki Kimura

Proceedings Volume 12606, Optical Manipulation and Structured Materials Conference; 126060H (2023) https://doi.org/10.1117/12.3008333
Event: Optics and Photonics International Congress, 2023, Yokohama, Japan

Abstract

Micro-manipulation enables us not only to move micro-objects but also control flow in micro-scale. Micro-scaled flow plays an important role in a wide range of fields including microfluidic devices and microbiological systems. Although these systems are frequently placed in viscous or complex fluids, micro-scaled flow in complex fluids have not been studied much compared to that in a simple liquid. In this study, we experimentally studied flow field induced by an optical driven nematic liquid crystal (NLC) droplet in an aqueous glycerol solution. The rotation of the droplet can be controlled with circularly polarized light. In a viscous fluid, slip at the surface of the droplet was observed and the slip velocity increased with the rotation speed of droplet, Due to the slip, the magnitude of flow velocity induced by the rotating droplet becomes smaller than that in water. As an application of the rotating NLC droplet, we used it for micro-viscometry. The estimated viscosity in an aqueous glycerol solution by micro-viscometry is quantitatively compared with the literature value. The difference between them is discussed by slip effect. This technique leads to further investigation for local viscosity in soft matter.

Citation Download Citation

Keita Saito and Yasuyuki Kimura "Slipping liquid crystal rotator in viscous fluids", Proc. SPIE 12606, Optical Manipulation and Structured Materials Conference, 126060H (20 September 2023); https://doi.org/10.1117/12.3008333

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