Device for preparing microdroplets based on magnetofluid excitation technology jet breakup

Abstract

The invention discloses a device for preparing microdroplets based on magnetofluid excitation technology jet breakup, relates to a micro-jetting device, and provides a preparing method applicable to the liquid microdroplets. According to the method, a disturbance generator and a jetting cavity are separated through a membrane. The cavity above the membrane is filled with a liquid metal solution, and high-frequency electromagnetic force generated by high-frequency pulse current flowing through liquid metal in a constant magnetic field serves as excitation waves. When the excitation waves are applied to a micro liquid column jetted out of a nozzle under a constant atmosphere condition, the micro liquid column can be fractured to form the uniform microdroplets. The micro-jetting device is implemented, and an adjacent excitation wave generator and the jetting cavity are processed in a main cavity. A disturbance wave generator is composed of permanent magnets, liquid metal, the membrane, electrodes, a signal source, a power amplifier and the like. The excitation wave generator is fixed between the permanent magnets, the electrodes are arranged inside the permanent magnets, and it is guaranteed that current is uniformly distributed; high-frequency electric signals are generated through the signal source and the power amplifier.

Description

technical field [0001] The invention relates to a micro-injection device, in particular to the preparation of micro-droplets based on the jet fracture of the magnetic fluid excitation technology. Background technique [0002] Droplet jetting is a technology that achieves precise distribution of microfluids by producing uniform micron-sized droplets, and is a non-contact direct writing droplet preparation technology. This technology is a new type of rapid prototyping technology developed on the basis of inkjet printing technology. This technology has the advantages of a wide range of sprayable materials, low cost, low energy consumption, and high efficiency. It is currently used in biochip preparation, micro-lens production, flexible material printing, micro-solder ball preparation and 3D printing technologies. [0003] Chinese patent CN101745763A discloses a method for preparing precision solder balls, which uses electromagnetic excitation to generate micro-disturbances, bu...

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Problems solved by technology

[0003] Chinese patent CN101745763A discloses a method for preparing precision solder balls, which uses electromagnetic excitation to generate micro-disturbances, but the equipment is relatively complicated

Chinese patent CN200610138558.1 discloses an air pressure pulse type droplet drive preparation system on demand, because the air pressure pulse is difficult to prepare at high frequency, so the frequency of droplet preparation is low

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