Why need ultrasonic spray nozzle for carbon nanotube coating?

Why need ultrasonic spray nozzle for carbon nanotube coating?

Ultrasonic carbon nanotube coating is a new type of coating that combines ultrasonic spraying technology and carbon nanotube material properties. The following is a related introduction:

Composition and structure
Carbon nanotubes are a nanoscale tubular material composed of carbon atoms, which has unique one-dimensional nanostructure, excellent mechanical properties, high conductivity and good chemical stability. In the coating, carbon nanotubes, as a key component, usually exist in a uniformly dispersed form, forming a network or interwoven microstructure, which provides basic performance support for the coating.

Preparation method
Ultrasound plays an important role in the coating preparation process. Generally, carbon nanotubes are mixed with appropriate solvents, binders, etc. to form a coating system, and then the high-frequency vibration generated by ultrasonic equipment is used to make the carbon nanotubes fully dispersed and uniform in the coating. The cavitation effect of ultrasound can break the agglomerates between carbon nanotubes, so that they are evenly distributed in the coating precursor in the form of single or small bundles. Subsequently, the coating is applied to the surface of the substrate by spraying, brushing, etc., and then the final coating is formed through processes such as drying and curing.

Why choose ultrasonic  spray nozzle equipment?

Mainly because this equipment can efficiently atomize carbon nanotube suspension, spray evenly and accurately control the coating thickness. The following is a specific analysis:

Efficient atomization: Ultrasonic atomization spray equipment uses high-frequency vibration of ultrasound to convert carbon nanotube suspension into tiny droplets. This atomization method can produce droplets with uniform particle size, and the droplet size can generally be controlled between a few microns and tens of microns. For carbon nanotube spraying, such a particle size can not only ensure that the carbon nanotubes are evenly distributed in the droplets, but also enable the droplets to better adhere to the substrate surface during the spraying process, avoiding the agglomeration or uneven distribution of carbon nanotubes due to excessive droplets.

Uniform spraying: The tiny droplets produced by ultrasonic atomization can be more evenly distributed on the substrate surface during spraying. Compared with traditional spraying methods, such as pressure spraying or electrostatic spraying, ultrasonic atomization spraying equipment can reduce the splashing and uneven deposition of droplets. This is because the vibration of the ultrasonic wave makes the droplets have a more consistent speed and direction when leaving the nozzle, thus forming a more uniform coating on the surface of the substrate. For carbon nanotube coatings, uniformity is crucial, which can ensure that the performance of the coating remains consistent in different areas, such as no obvious differences in conductivity, mechanical properties, etc.

Precise control: Ultrasonic atomization spraying equipment can accurately control the spraying amount and coating thickness of carbon nanotube suspension by adjusting the power, frequency, spraying time, speed and other parameters of the ultrasonic wave. In the application of carbon nanotube coatings, there are often strict requirements on the thickness of the coating. For example, in the electrode coating of electronic devices, the thickness of the carbon nanotube coating needs to be precisely controlled to achieve the best conductivity and electrical properties. This precise control capability of ultrasonic atomization spraying equipment helps to meet the strict requirements of carbon nanotube coating thickness in different application scenarios and improve the quality and consistency of the coating.

Reduce agglomeration: Carbon nanotubes are prone to agglomeration due to their high specific surface area and surface activity. The cavitation effect and mechanical vibration during the ultrasonic atomization process can disperse the carbon nanotube agglomerates to a certain extent, so that the carbon nanotubes can maintain a good dispersion state in the suspension. In this way, during the spraying process, coating defects caused by carbon nanotube agglomeration, such as excessive local concentration and uneven coating, can be avoided, which is conducive to the formation of high-quality carbon nanotube coatings.

Small impact on material properties: The ultrasonic atomization spraying process is relatively gentle, and during the atomization and spraying process, it will not cause significant damage or changes to the structure and properties of carbon nanotubes. Carbon nanotubes can maintain their original excellent properties, such as high strength and high conductivity, thereby ensuring that the carbon nanotube coating after spraying can give full play to its due performance advantages.