Zhou Shaoqi, Nazari Sabereh, Hassanzadeh Ahmad, Bu Xiangning, Ni Chao, Peng Yaoli, Xie Guangyuan, He Yaqun
Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), China University of Mining and Technology, Xuzhou 221116, China; School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China.
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China.
Ultrason Sonochem. 2022 Mar;84:105965. doi: 10.1016/j.ultsonch.2022.105965. Epub 2022 Feb 25.
Fundamental research on bulk micro-nanobubbles (BMNBs) has grown rapidly due to the demand for their industrial applications and potential role in interfacial sciences. This work focuses on examining properties of such bubbles, including the number, concentration, zeta potential, and surface tension in water. For this purpose, BMNBs were generated by the hydrodynamic cavitation (HC) mechanism. Distilled water and air in the experiments were the liquid and gas phases, respectively. The characterization of bulk microbubbles (BMBs) and bulk nanobubbles (BNBs) were performed through focused beam reflectance measurement (FBRM) and nanoparticle tracking analysis (NTA) techniques, respectively. Zeta potential and surface tension of aqueous solutions were measured at different time and aeration rates. The results showed that aeration rate and preparation time had an important role in the properties of BNBs (concentration, bubble size, and surface charge) and BMBs (number, and bubble size). The instability of BMBs led to the rapid changes in the dissolved oxygen (DO) content in the water. The number of BMBs decreased when preparation time and aeration rate increased, but their size remained constant. By enhancing the preparation time and aeration rate, the concentration of BNBs improved first and then reduced. Additionally, the surface tension of an aqueous solution containing BNBs was significantly lower than that of pure water.
由于对体相微纳气泡（BMNBs）的工业应用需求及其在界面科学中的潜在作用，关于它们的基础研究发展迅速。这项工作着重研究此类气泡的性质，包括水中的数量、浓度、zeta电位和表面张力。为此，通过水力空化（HC）机制产生BMNBs。实验中蒸馏水和空气分别作为液相和气相。分别通过聚焦光束反射测量（FBRM）和纳米颗粒跟踪分析（NTA）技术对体相微气泡（BMBs）和体相纳米气泡（BNBs）进行表征。在不同时间和曝气速率下测量水溶液的zeta电位和表面张力。结果表明，曝气速率和制备时间对BNBs（浓度、气泡尺寸和表面电荷）和BMBs（数量和气泡尺寸）的性质有重要影响。BMBs的不稳定性导致水中溶解氧（DO）含量迅速变化。当制备时间和曝气速率增加时，BMBs的数量减少，但其尺寸保持不变。通过延长制备时间和提高曝气速率，BNBs的浓度先升高后降低。此外，含有BNBs的水溶液的表面张力明显低于纯水。
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