Abstract
Recently, bulk nanobubbles have attracted intensive attention due to the unique physicochemical properties and important potential applications in various fields. In this study, periodic pressure change was introduced to generate bulk nanobubbles. N2 nanobubbles with bimodal distribution and excellent stabilization were fabricated in nitrogen-saturated water solution. O2 and CO2 nanobubbles have also been created using this method and both have good stability. The influence of the action time of periodic pressure change on the generated N2 nanobubbles size was studied. It was interestingly found that, the size of the formed nanobubbles decreases with the increase of action time under constant frequency, which could be explained by the difference in the shrinkage and growth rate under different pressure conditions, thereby size-adjustable nanobubbles can be formed by regulating operating time. This study might provide valuable methodology for further investigations about properties and performances of bulk nanobubbles.
Highlights
In this paper, the adjustable N2, O2, and CO2 BNBs were generated by using periodic pressure change method
The scattering signal is ultrasensitive to impurities, as in the system of ethanol and water mixture studied by Häbich et al.[31], it was found there is no obvious light scattering of bulk nanobubbles when the impurities in AR grade ethanol are removed by distillation
It could be confirmed that the distinct DLS signal of nitrogen-saturated ultrapure water after applying periodic pressure change is contributed by the formed nanobubbles
Summary
The adjustable N2, O2, and CO2 BNBs were generated by using periodic pressure change method. The existence of nanobubbles was testified by Tyndall effect and the images of freeze-fracture transmission electron microscope (FF-TEM), and the size distribution was investigated using light scattering method. The stability of generated BNBs was investigated by the time-dependent size change. The generation mechanism of BNBs was discussed and verified by the dependence of size on periodic pressure change time
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