A Henry's law method for generating bulk nanobubbles
A Henry's law method for generating bulk nanobubbles
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DOI：
10.1039/d0nr03332d
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发表时间：
2020-08-07
期刊：
影响因子：
6.7
通讯作者：
Barigou, Mostafa
中科院分区：
文献类型：
--
作者：
Ferraro, Gianluca;Jadhav, Ananda J.;Barigou, Mostafa
根据亨利定律，开发了一种产生块状纳米气泡悬浮液的新技术，该定律指出，液体中溶解的气体的量与其在液体上方的分压成正比。这一形成真空脱气基础的原理在这里被利用，通过在密封的注射器内连续膨胀/压缩行程，在纯水中产生超过10(9)个气泡毫升(-1)的稳定的块状纳米气泡。我们提供的证据表明，观察到的纳米实体一定是充满气体的纳米气泡，这表明：(I)它们不能归因于有机或无机杂质；(Ii)它们随着时间的推移逐渐消失，而它们的平均尺寸保持不变；(Iii)它们的数密度取决于水中溶解气体的浓度及其溶解度；以及(Iv)添加气体的喷射提高了工艺产量。我们研究了这些纳米气泡的性质，包括溶解气体类型、水的pH值和不同价态盐的存在对其数密度和稳定性的影响。考虑到该技术用于大规模生产纳米气泡悬浮液的潜力，我们描述了一个成功测试的自动化模型，并概述了工艺放大的基础。
A new technique for generating bulk nanobubble suspensions has been developed based on Henry's law which states that the amount of dissolved gas in a liquid is proportional to its partial pressure above the liquid. This principle which forms the basis of vacuum degasification has been exploited here to produce stable bulk nanobubbles in excess of 10(9)bubble mL(-1)in pure water, through successive expansion/compression strokes inside a sealed syringe. We provide evidence that the observed nano-entities must be gas-filled nanobubbles by showing that: (i) they cannot be attributed to organic or inorganic impurities; (ii) they disappear gradually over time whilst their mean size remains unchanged; (iii) their number density depends on the concentration of dissolved gas in water and its solubility; and (iv) added sparging of gas enhances process yield. We study the properties of these nanobubbles including the effects of type of dissolved gas, water pH and the presence of different valence salts on their number density and stability. Given the potential of the technique for large scale production of nanobubble suspensions, we describe a successfully tested automated model and outline the basis for process scale-up.