Nano Suspensions and Nano Coatings

 

Ultrasonic waves in nano coatings and nano suspensions

 

Nanomaterials, such as carbon nanotubes, metal oxides, and nanoclay, are typically manufactured as dry materials, but due to their cohesiveness, they can clump or agglomerate when wet as sprayable coatings. Ultrasonic spraying technology is very suitable for decomposing clumps in solution.

 

Ultrasonic spraying system is used to form nano coatings on three-dimensional devices and two-dimensional linear substrates, as well as spray nano suspensions in dispersions.

 

 

Nano coating:

 

Due to its low flow rate capability and highly uniform droplet size, ultrasonic spraying technology can be used to spray uniform nano thin coatings. The common applications of ultrasonic spraying technology are in:

Anti reflective (AR) coating on solar cells

 

Nano suspension:

 

The same vibration that produces ultrasonic spray also has the characteristics of inhibiting agglomeration or agglomeration of nano materials. This phenomenon is most common among carbon nanotubes. In the traditional air spray atomization process, carbon nanotubes tend to agglomerate, which does not benefit from the vibration effect of ultrasound. The ultrasonic nozzle vibrates the liquid through the cavitation effect at the tip of the ultrasonic nozzle. This vibration is the cause of atomization. On our homepage, there is a video showcasing the work situation of the principals. This same vibration helps to disperse nanoparticles. Some common nanosuspensions successfully applied through ultrasonic spraying technology:

◆ Carbon nanotubes

◆ Nanowires and Graphene

◆ Magnesium oxide, indium tin oxide, cerium oxide, iron oxide, zinc oxide, cerium oxide, zirconium oxide, titanium and other metal oxides

Transparent conductive oxide (TCO) in touch screen applications.

◆ Drugs

 

Spray drying:

 

Ultrasonic nozzles are also used in spray drying applications to produce nanoparticles for water-based and organic applications. Ultrasonic nozzles can typically produce smaller particle sizes than traditional nozzles, so the droplets generated by ultrasonic waves can dry more effectively during flight. In addition, compared with the traditional method, the generated low-speed spray increases the output of nanoparticles, makes the materials stay in the air longer, and the spray dryer chamber wall has less coating. Finally, introducing two independent liquid paths into the same ultrasonic nozzle can be used to manufacture microcapsules.

 

Nano antibacterial coatings and nano clay:

 

Nano antibacterial agents are commonly used in the food industry as top coatings for decorative coatings and glazes, as well as in the application of flavorings and fragrances. The nano clay coating using ultrasonic nozzles is used as a barrier protection for polyolefin films in the packaging industry. These films are applied in the food industry to extend their shelf life.