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- Title
Developing an Active Microfluidic Pump and Mixer Driven by AC Field-Effect-Mediated Induced-Charge Electro-Osmosis of Metal–Dielectric Janus Micropillars: Physical Perspective and Simulation Analysis.
- Authors
Liu, Weiyu; Tao, Ye; Chen, Yaoyao; Ge, Zhenyou; Chen, Junshuo; Li, Yanbo
- Abstract
Featured Application: The Janus AC-FFET technique proposed herein can be effectively applied to the development of active microfluidic pumps and mixers driven by pure ICEO, even in the absence of an external moving element, in which both the horizontal pump-flow component, ux, and the transversal mixing flow component, uy, are created by the induced-charge electrokinetic effect. We propose herein a novel microfluidic approach for the simultaneous active pumping and mixing of analytes in a straight microchannel via the AC field-effect control of induced-charge electro-osmosis (ICEO) around metal–dielectric solid Janus cylinders of inherent inhomogeneous electrical polarizability immersed in an electrolyte solution. We coin the term "Janus AC flow field-effect transistor (Janus AC-FFET)" to describe this interesting physical phenomenon. The proposed technique utilizes a simple device geometry, in which one or a series of Janus microcylinders are arranged in parallel along the centerline of the channel's bottom surface, embedding a pair of 3D sidewall driving electrodes. By combining symmetry breaking in both surface polarizability and the AC powering scheme, it is possible, on demand, to adjust the degree of asymmetry of the ICEO flow profile in two orthogonal directions, which includes the horizontal pump and transversal rotating motion. A comprehensive mathematical model was developed under the Debye–Hückel limit to elucidate the physical mechanism underlying the field-effect-reconfigurable diffuse-charge dynamics on both the dielectric and the metal-phase surfaces of the Janus micropillar. For innovation in applied science, an advanced microdevice design integrating an array of discrete Janus cylinders subjected to two oppositely polarized gate terminals is recommended for constructing an active microfluidic pump and mixer, even without external moving parts. Supported by a simulation analysis, our physical demonstration of Janus AC-FFET provides a brand-new approach to muti-directional electro-convective manipulation in modern microfluidic systems.
- Subjects
ELECTRO-osmosis; APPLIED sciences; FIELD-effect transistors; PUMPING machinery; PHENOMENOLOGICAL theory (Physics); SYMMETRY breaking; ELECTROLYTE solutions
- Publication
Applied Sciences (2076-3417), 2023, Vol 13, Issue 14, p8253
- ISSN
2076-3417
- Publication type
Article
- DOI
10.3390/app13148253