| Abstract Scope |
When ultrasonic waves transmit through a liquid medium, ultrasonic cavitation bubbles and acoustic streaming flow are created. In addition, if nanometre and/or micrometre solid particles are present, the system become a complex multiphase flow system, which is common in many ultrasound-based materials synthesis and manufacturing processes. Currently, there are many scientific issues remain unsolved concerning the dynamic interactions among the solid-liquid-bubbles
In this paper, I present our very recent research, including (1) ultrasonic bubble interactions with the hydrophobic particles, molybdenum disulfide; and (2) ultrasonic bubble implosion enhanced exfoliation of the layer structures of highly ordered pyrolytic graphite.
The research provides unambiguous real-time and in-situ evidence on how oscillating ultrasonic bubbles can very effectively disperse and transport the hydrophobic particles, and how ultrasonic bubble implosion can enhance the exfoliation of layered materials. Advanced numerical modelling was also conducted to provide more quantitative understanding on the underlying mechanisms. |