Device for generating liquid electro-rotation

Abstract

The invention discloses a device for generating liquid electro-rotation, and relates to the technical field of hydrodynamics, electrodynamics and microfluidics. A microcavity is made of medical glass; a flexible single-sided copper-cladded polyimide film is processed by a soft lithography technology to produce a copper electrode; the copper electrode is placed in the microcavity in a way of attaching a wall; fluorescent particle suspension is placed in the microcavity; a chip is connected with a direct-current voltage source and placed on a microscope observation platform; the motion of the fluorescent particles is observed by a CCD camera in real time; moreover, an image of motion trajectories of the fluorescent particle suspension in the chip is shot and inputted to a computer for image storage and analysis. The method is simple, can effectively avoid shortcomings of an experimental method of a liquid film motor at the present stage, and provides richer research means for application of electro-rotation effect.

Description

technical field [0001] The invention relates to the technical fields of fluid mechanics, electrodynamics and microfluidic control, and generates electrorotation phenomenon in a micro chamber through the combination of fluid mechanics and electrodynamics. The controllable electrofluidic effect produced by the invention has important application value for the development of microfluidic technology. Background technique [0002] In recent years, it has been reported that a suspended polar liquid film exhibits controllable electro-induced flow (rotation or vibration) in a crossed DC or AC electric field. Adjusting the magnitude and direction of the applied voltage can control the speed and direction of the liquid film rotation. This electro-induced flow effect is called "liquid film motor". The controllable flow of liquid film motors opens new avenues for their potential technological applications, such as making micromotors, microcentrifuges, micromixers and drug delivery devi...

AI Technical Summary

Problems solved by technology

Although relevant theoretical studies are emerging, the experimental devices are still far from practical applications.

The main shortcomings are as follows: ① the thickness of the rotatable suspension film is generally several hundred nanometers or even thinner, and the liquid film exists for a short time and is easy to rupture, so it is difficult to have any practical application; ② in order to avoid the movement of the air flow on the liquid film The influence of the whole device is placed in a sealed cavity, which also seriously affects the application research of the electroflow effect

In short, there is no method so far that can realize the electroflow effect through a simple experimental device, so as to provide a reliable experimental method for subsequent applied research.

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