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Acoustothermal Nucleation of Surface Nanobubbles
Nano Letters ( IF 9.6 ) Pub Date : 2021-01-25 , DOI: 10.1021/acs.nanolett.0c03895 Saikat Datta 1 , Rohit Pillai 1 , Matthew K. Borg 1 , Khellil Sefiane 1
Nano Letters ( IF 9.6 ) Pub Date : 2021-01-25 , DOI: 10.1021/acs.nanolett.0c03895 Saikat Datta 1 , Rohit Pillai 1 , Matthew K. Borg 1 , Khellil Sefiane 1
Affiliation
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Ultrasonic surface vibration at high frequencies (
(100 GHz)) can nucleate bubbles in a liquid within a few nanometres from a surface, but the underlying mechanism and the role of surface wettability remain poorly understood. Here, we employ molecular simulations to study and characterize this phenomenon, which we call acoustothermal nucleation. We observe that nanobubbles can nucleate on both hydrophilic and hydrophobic surfaces, and molecular energy balances are used to identify whether these are boiling or cavitation events. We rationalize the nucleation events by defining a physics-based energy balance, which matches our simulation results. To characterize the interplay between the acoustic parameters, surface wettability, and nucleation mechanism, we produce a regime map of nanoscopic nucleation events that connects observed nanoscale results to macroscopic experiments. This work provides insights to better design a range of industrial processes and clinical procedures such as surface treatments, mass spectroscopy, and selective cell destruction.
中文翻译：
表面纳米气泡的声热成核
高频下的超声波表面振动（（100 GHz））可以在距离表面几纳米的范围内使气泡中的气泡成核，但其潜在机理和表面润湿性的作用仍知之甚少。在这里，我们使用分子模拟来研究和表征这种现象，我们称之为声热成核。我们观察到，纳米气泡可以在亲水性和疏水性表面上成核，并且分子能量平衡被用来识别这些是沸腾还是空化事件。我们通过定义与我们的模拟结果相匹配的基于物理的能量平衡来合理化成核事件。为了表征声学参数，表面润湿性和成核机理之间的相互作用，我们生成了纳米成核事件的状态图，该图将观察到的纳米级结果与宏观实验相连接。
更新日期：2021-02-10
(100 GHz)) can nucleate bubbles in a liquid within a few nanometres from a surface, but the underlying mechanism and the role of surface wettability remain poorly understood. Here, we employ molecular simulations to study and characterize this phenomenon, which we call acoustothermal nucleation. We observe that nanobubbles can nucleate on both hydrophilic and hydrophobic surfaces, and molecular energy balances are used to identify whether these are boiling or cavitation events. We rationalize the nucleation events by defining a physics-based energy balance, which matches our simulation results. To characterize the interplay between the acoustic parameters, surface wettability, and nucleation mechanism, we produce a regime map of nanoscopic nucleation events that connects observed nanoscale results to macroscopic experiments. This work provides insights to better design a range of industrial processes and clinical procedures such as surface treatments, mass spectroscopy, and selective cell destruction.
中文翻译：
表面纳米气泡的声热成核
高频下的超声波表面振动（
（100 GHz））可以在距离表面几纳米的范围内使气泡中的气泡成核，但其潜在机理和表面润湿性的作用仍知之甚少。在这里，我们使用分子模拟来研究和表征这种现象，我们称之为声热成核。我们观察到，纳米气泡可以在亲水性和疏水性表面上成核，并且分子能量平衡被用来识别这些是沸腾还是空化事件。我们通过定义与我们的模拟结果相匹配的基于物理的能量平衡来合理化成核事件。为了表征声学参数，表面润湿性和成核机理之间的相互作用，我们生成了纳米成核事件的状态图，该图将观察到的纳米级结果与宏观实验相连接。
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