Thermodynamic Stability of Nanobubbles
Thermodynamic Stability of Nanobubbles
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发表时间：
2015-03
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通讯作者：
P. Attard
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作者：
P. Attard
观察到的纳米气泡的稳定性与经典成核理论中众所周知的结果相矛盾，即临界半径在微观上和热力学上都不稳定。这里，纳米级稳定性被证明是两种非经典机制的综合结果。结果表明，表面张力随着过饱和度的增加而降低，这给出了纳米级的临界半径。虽然自由球形气泡和在疏水表面上移动的半球形气泡都不是稳定的，但结果表明，具有固定接触边缘的固定半球形气泡是稳定的，并且总熵在临界半径处最大。
The observed stability of nanobubbles contradicts the well-known result in classical nucleation theory, that the critical radius is both microscopic and thermodynamically unstable. Here nanoscopic stability is shown to be the combined result of two non-classical mechanisms. It is shown that the surface tension decreases with increasing supersaturation, and that this gives a nanoscopic critical radius. Whilst neither a free spherical bubble nor a hemispherical bubble mobile on an hydrophobic surface are stable, it is shown that an immobilized hemispherical bubble with a pinned contact rim is stable and that the total entropy is a maximum at the critical radius.