Effects of Surface Tension on the Stability of Surface Nanobubbles
Effects of Surface Tension on the Stability of Surface Nanobubbles
复制标题
表面张力对表面纳米气泡稳定性的影响
DOI：
10.3389/fphy.2021.731804
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发表时间：
2021-09
影响因子：
3.1
通讯作者：
Binghai Wen
中科院分区：
文献类型：
--
作者：
Yongcai Pan;Bing He;Binghai Wen
表面纳米气泡的存在已经通过各种检测方法得到证实，但其异常稳定性的机制尚不清楚，在过去的20年里引起了广泛的研究兴趣。实验和理论分析试图解释这些稳定性，如非常长的寿命，非常高的压力和非常小的接触角。一些研究人员利用吸引疏水势来补充钉钉过饱和理论，成功地解释了表面纳米气泡在欠饱和环境下的存活。然而，纳米气泡在亲水性表面的存活仍然需要相当大的过饱和。在本文中，我们引入了可变表面张力，即Tolman依赖和状态依赖，并表明它们有效地促进了纳米气泡的稳定性。表面张力的降低可以导致更大的接触角，甚至使纳米气泡在高亲水性表面上存活。在托曼依赖中，接触角演化的变化率减慢，当气泡尺寸接近托曼长度时更为明显。接触角在状态依赖性上也越来越大，气体饱和度的增加有利于表面纳米气泡的稳定性。当气体饱和比为3时，气泡在非常亲水的表面上也能保持稳定，而在疏水表面上长大。变化的表面张力削弱了对表面纳米气泡稳定性的饱和度要求。
The existence of surface nanobubbles has already been confirmed by variable detection methods, but the mechanism of their extraordinary stability remains unclear and has aroused widespread research interest in the past 2 decades. Experiments and theoretical analyses have tried to account for these stabilities such as the very long lifetime, very high pressure and very small contact angle. Attractive hydrophobic potential was applied to complement the pinning oversaturation theory and successfully explain the survival of surface nanobubbles in undersaturation environment by some researchers. However, the survival of nanobubbles on hydrophilic surface still requires sizeable oversaturation. In this paper, we introduce the variable surface tensions, namely Tolman dependence and state-dependence, and show that they effectively promote the stability of nanobubbles. The decrease in surface tension can lead to larger contact angle and even make the nanobubbles survivable on the highly hydrophilic surface. In Tolmandependence, the changing rate in the contact angle evolution slows down, which is more obvious when the bubble size is close to the Tolman length. The contact angle is also getting larger in the state dependence, and the increase of the gas saturation degree is beneficial to the stability of surface nanobubbles. With the gas saturation ratio of 3, the bubbles on the quite hydrophilic surface can also be stable, while grow up on the hydrophobic surface. The variable surface tensions weaken the need of saturation degree for the surface nanobubbles’ stability.
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