A device for preparing microdroplets based on the magnetic fluid excitation technology jet fracture and the method for preparing microdroplets
A magnetic fluid and jet technology, applied in the field of micro-injection devices, can solve problems such as complex equipment, difficult air pressure pulses, and low frequency of droplet preparation, and achieve the effect of simplifying test devices and improving efficiency
Active Publication Date: 2020-05-08
BEIJING UNIV OF TECH
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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. Since the air pressure pulse is difficult to prepare at high frequency, the frequency of droplet preparation is low
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Embodiment 1
[0017] see Figure 1-2 , the embodiment of the present invention is provided with a signal generator 1, a power amplifier 2, a disturbance generator upper cover plate 3, a liquid metal placement chamber 4, a copper electrode 5, a diaphragm 6, an injection chamber 7, and a lower cover plate 8 with a nozzle , Nozzle 9, Catheter 10, Liquid Storage Chamber 11, Pressure Reducing Valve 12, Air Compressor 13, Disturbance Generator 14, Device Fixing Hole 15.
[0018] A permanent magnet is loaded inside the disturbance generator 14 to generate a constant magnetic field. A copper electrode 5 is placed inside the disturbance generator 14 . The positive and negative electrodes of the variable high-frequency electrical signal generated by the signal source 1 and the power amplifier 2 are connected to the copper electrode 5 . The inside of the liquid metal placement chamber 4 is filled with liquid metal, and the disturbance generator 14 and the injection chamber 7 are assembled together thr...
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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 jet fracture based on magnetic fluid excitation technology. Background technique [0002] Droplet jetting is a technology that achieves precise distribution of microfluids by producing uniform micron-sized droplets. It 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, microlens 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, but th...
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IPC IPC(8): B22F3/115B33Y30/00
CPCB22F3/003B22F3/115B33Y30/00
Inventor 雷永平王同举林健符寒光夏志东张楠
Owner BEIJING UNIV OF TECH