Optothermal Actuation of Unidirectional Thermo-osmotic Flows
이 뉴스, 어떠셨어요?
한 번의 탭으로 반응을 남겨요 · 로그인 불필요
Abstract
In this paper, we experimentally demonstrate the microscale direction control of thermoosmotic flows using a focused-laser heating.
The key is the off-center laser irradiation on an immobilized light-absorbing microparticle, which generates a nonuniform, asymmetric heat source.
The resulting thermo-osmotic flows are evaluated using the optically trapped particle tracking velocimetry (ot-PTV), presented in our preceding paper (T.
Tsuji, et al., Physical Review Fluids 11, 034901 (2026)).
It is shown that the flow characteristics can be modulated by the ionic strength of a sample solution and/or the surface molecular coating of the substrate.
In particular, the significance of ionic strength on thermo-osmotic flows are discussed based on the surface potential of the substrate measured by frequency-modulated atomic force microscopy.