Electro-wetting based non-metallic flake electrostatic spraying device and method thereof

By utilizing the electrowetting effect of a non-metallic sheet electrostatic spraying device with a large inner diameter capillary and a non-metallic emitter surface, the stability and durability issues of high surface tension liquid spraying are solved. Stable conical jets under low voltage are achieved, which are suitable for fine spraying, functional coating deposition, and analytical testing.

CN122141876APending Publication Date: 2026-06-05SOUTHERN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTHERN UNIVERSITY OF SCIENCE AND TECHNOLOGY
Filing Date
2026-01-07
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing electrostatic spraying devices struggle to achieve controllable field enhancement and stable conical jets when spraying high surface tension liquids without relying on additives and complex auxiliary gas-liquid circuits. This results in problems such as high starting voltage, poor stability, insufficient material durability, and high manufacturing complexity.

Method used

A non-metallic thin-film electrostatic spraying device based on electrowetting is adopted. By supplying liquid through a large-diameter capillary tube and the electrowetting effect on the surface of the non-metallic emitter, combined with geometric design, a stable Taylor cone and cone jet are formed. An external electric field is used to form a liquid film on the surface of the emitter and guide it to the edge, so as to achieve low-voltage spraying and a wide stability window.

Benefits of technology

It enables stable spraying of high surface tension liquids under low voltage, reduces electrical risks, improves the long-term reliability and contamination resistance of the spray, simplifies the manufacturing process, and facilitates array applications.

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Abstract

The present application relates to the technical field of sheet-shaped emitter made of non-metallic material, and provides an electro-wetting-based non-metallic sheet electrostatic spraying device and method thereof, the device comprising a liquid storage tank, a coarse inner diameter capillary, a connector and a sheet-shaped emitter made of non-metallic material. The liquid storage tank is used for storing and providing the liquid to be sprayed; the coarse inner diameter capillary is horizontally arranged and communicates with the liquid storage tank for conveying the liquid; the connector is arranged at the outlet end of the capillary; the emitter is arranged at the outlet end of the capillary and is spaced apart from the capillary, and the emitter is connected with the capillary through the connector. Under the action of an applied electric field, a liquid film is formed on the surface of the emitter, the liquid spreads along the surface of the emitter to the edge and forms a Taylor cone and a conical jet. The electro-wetting film formation on the outer surface of the emitter and the synergistic effect of geometric field strengthening enable the formation of a stable Taylor cone and a conical jet of a high-surface-tension liquid at the edge of the non-metallic emitter, thereby realizing low-voltage spraying and a wide and stable window.
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