Comparative Analysis of Nanobubble Characteristics by Decompression Friction and Cavitation Method

Nanobubbles are microscopic gaseous bubbles at the nanoscale within a solvent, maintained by electrostatic interactions, and hold remarkable potential for environmental and industrial applications. This study aimed to compare nanobubble production methods - the decompression friction method and the cavitation method - by measuring the number and size of nanobubbles produced. Additionally, the study analyzed how these characteristics changed over time and in response to internal impacts. Results showed that nanobubbles produced by the decompression friction method had an average density of 1.3 times higher and smaller particle sizes than those produced by the cavitation method. Over time, the number density of nanobubbles produced by the decompression friction method decreased after 10 minutes, while the cavitation method resulted in a slight increase. During internal impact experiments, the decompression friction method increased particle counts at 35,000 rpm, whereas the cavitation method caused a decrease at 10,000 and 20,000 rpm. These findings suggest that the nanobubble generation method can provide advantages for industrial applications, highlighting nanobubbles' distinct characteristics and time-dependent changes.