A V-groove-based invisible droplet guidance method

Abstract

The invention discloses a V-groove-based liquid droplet implicit guidance method. A precision numerical control machine tool is used to manufacture a V-groove track with a triangular cross-sectional shape on a hydrophilic substrate body. When the droplet falls on the long and narrow V-shaped groove track, it follows the principle of minimum energy and completely penetrates into the rough V-shaped groove with a large solid-liquid contact area. When the track is given a certain inclination angle, that is, the plane where the track is located and When the horizontal plane is at a certain angle, the droplet will recondense into a droplet at the lower end of the track under the action of gravity, thereby controlling the trajectory of the droplet. The guidance method will not cause the droplet to derail, and realize the hidden sex guide. The droplet implicit guidance method has no additional requirements on the track type, and the droplet implicit guidance method can be used for the straight track, curved track, or broken line track. The droplet implicit guidance method is easy to operate, has a wide range of applications, is less affected by the environment, and can effectively expand the controllable types of droplets.

Description

technical field [0001] The invention relates to the technical field of droplet behavior control, in particular to a V-groove-based invisible droplet guidance method. Background technique [0002] In recent years, with the development of microfluidic technology, droplet behavior control technology has become an emerging research hotspot, and has been widely used in many fields such as anti-icing, drug delivery, and self-lubrication. Among them, the method of controlling the movement path of the droplet by constructing the guide track to promote the droplet to move along the track is called the droplet guidance method. [0003] At present, there are many methods for controlling droplet guidance. Chinese patent CN 104345140A proposes a "magnetic droplet control device and magnetic droplet control method". This control method is limited to controlling the movement path of magnetic droplets. Magnetic droplets cannot be guided; the invention patent CN106432767A relates to "a prep...

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Problems solved by technology

[0003] At present, there are many methods for controlling droplet guidance. Chinese patent CN 104345140A proposes a "magnetic droplet control device and magnetic droplet control method". This control method is limited to controlling the movement path of magnetic droplets. Magnetic droplets cannot be guided; the invention patent CN106432767A relates to "a preparation method of photothermal self-lubricating oil gel for remote and precise driving of droplets", which combines nanoparticles with polydimethylsiloxane and the curing agent are mixed and heated to cure, and then the obtained composite material is soaked in the lubricating liquid to swell to obtain the photothermal self-lubricating oil gel; however, the preparation process is cumbersome, and it is necessary to adjust the irradiation point and direction of the near-infrared laser to achieve the final result. Realize the directional movement of droplets, and the operation is complicated; the invention patent CN 106053869A proposes "a guiding method based on wall wettability to control droplets without mass loss". Derailment is prone to occur under the circumstances, resulting in the failure of guidance

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