Research progress on elimination and size control of bulk nanobubbles
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摘要:
不同方法发生的体相纳米气泡尺寸与数量浓度相差悬殊。气泡尺寸的多分散性及数量浓度的本征差异性给体相纳米气泡的性能研究及效能比较带来了不便,同时也不利于纳米气泡技术的标准化、产业化。因此,体相纳米气泡尺寸及数量浓度的调控十分重要。对近年来体相纳米气泡尺寸和数量浓度的调控技术进行了总结及综合评估。主要分析对比了循环均化法、微流控技术和膜技术等尺寸调控方法与冻融去除法、超声消减法等数量浓度调控方法的优劣,从可调控性、设备依赖性、工艺难易度、可拓展性及成本等方面对各方法进行了评估,并结合本课题组已发表研究成果对体相纳米气泡的尺寸和数量浓度调控提出新的认识与思路,以期为深入了解纳米气泡的尺寸效应和超常稳定机制以及体相纳米气泡定量分析与应用,特别是与尺寸相关的性质、效应和应用提供新思考。
Abstract:There are various bubble generation methods which can produce bulk nanobubbles with different sizes and different number concentrations. However, the polydispersity of bubble size and the intrinsic difference of number concentration are inconvenient to the performance research and efficiency comparison of bulk nanobubbles, and it is also not conducive to the standardization and industrialization of nanobubble technology. Therefore, the size control and number concentration adjustment for the bulk nanobubbles are very important. The technologies for controlling the size and number concentration of the bulk nanobubbles in recent years were summarized and comprehensively evaluated. The advantages and disadvantages of size control methods such as cyclic homogenization, microfluidic technology and membrane technology, and number concentration control methods such as freeze-thaw removal method and ultrasonication reduction method were analyzed and compared. All methods were evaluated in terms of controllability, equipment dependence, process difficulty, scalability and cost, and new understandings and ideas for the regulation of nanobubble size and concentration were proposed combined with the published research results. It helped to deeply understand the size effect of the nanobubbles and extra stabilization mechanism and provide new ideas for the quantitative analysis and applications of bulk nanobubbles, especially for the nanobubble size-related properties, effects and applications.
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Key words:
- bulk nanobubbles /
- generation method /
- bubble elimination /
- size control /
- size effect
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图 1 冻融前后纳米气泡数量浓度的变化[10]
Figure 1. Change of number concentration of the nanobubbles before and after freezing and thawing
图 3 文丘里型水动力空化装置中通过循环使纳米气泡尺寸均化[38]
Figure 3. The size homogenization of the nanobubbles by circulation through Venturi-type hydrodynamic cavitation device
图 4 通过微流控技术发生纳米气泡示意[47]
Figure 4. Schematic for the nanobubbles generated by microfluidic technology
图 6 使用多孔氧化铝生成体相纳米气泡的示意及气泡尺寸分布[9]
Figure 6. Schematic for the bulk nanobubbles generated by porous alumina and their bubble size distributions
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