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首页> 外文期刊>The Journal of Chemical Physics >Nanoscale pinning effect evaluated from deformed nanobubbles
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Nanoscale pinning effect evaluated from deformed nanobubbles

机译：从变形的纳米柔臼评估纳米级钉尼效果

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Classical thermodynamics theory predicts that nanosized bubbles should disappear in a few hundred microseconds. The surprisingly long lifetime and stability of nanobubbles are therefore interesting research subjects. It has been proposed that the stability of nanobubbles arises through pinning of the three-phase contact line, which results from intrinsic nanoscale geometrical and chemical heterogeneities of the substrate. However, a definitive explanation of nanobubble stability is still lacking. In this work, we examined the stability mechanism by introducing a "pinning force." We investigated nanobubbles at a highly ordered pyrolytic graphite/pure water interface by peak force quantitative nano-mechanical mapping and estimated the pinning force and determined its maximum value. We then observed the shape of shrinking nanobubbles. Because the diameter of the shrinking nanobubbles was pinned, the height decreased and the contact angle increased. This phenomenon implies that the stability results from the pinning force, which flattens the bubble through the pinned three-phase contact line and prevents the Laplace pressure from increasing. The pinning force can also explain the metastability of coalesced nanobubbles, which have two semispherical parts that are joined to form a dumbbell-like shape. The pinning force of the semispherical parts was stronger than that of the joint region. This result demonstrates that the contact line of the semispherical parts is pinned strongly to keep the dumbbell-like shape. Furthermore, we proposed a nanobubble generation mechanism for the solvent-exchange method and explained why the pinning force of large nanobubbles was not initially at its maximum value, as it was for small nanobubbles. Published by AIP Publishing.
机译：经典的热力学理论预测纳米泡泡应在几百微秒内消失。因此，纳米博根的令人惊讶的长寿和稳定性是有趣的研究受试者。已经提出，通过固有的纳米级几何和化学异质性引用纳米杆纹的稳定性，这是由基板的内在纳米级几何和化学异质性导致的。然而，仍然缺乏对纳米柔臼稳定性的明确解释。在这项工作中，我们通过引入“钉扎力”来检查稳定机制。通过峰值力定量纳米机械映射，在高度有序的热解石墨/纯水界面处研究了纳米胶布并估计了钉扎力并确定其最大值。然后，我们观察到纳米柔臼缩小的形状。因为收缩纳米泡的直径被固定，所以高度降低，接触角增加。这种现象意味着稳定性由钉扎力产生，该钉力通过钉扎的三相接触线达到气泡并防止拉普拉斯压力增加。钉扎力还可以解释结合的纳米骨库的常温性，其具有连接以形成哑铃状形状的两个半球形部件。半球形部件的钉态力比接合区域强。该结果表明，半球形部件的接触线强固定以保持哑铃状形状。此外，我们提出了一种用于溶剂 - 交换方法的纳米柔臼生成机制，并解释了为什么大纳米泡的固定力最初不是在其最大值下，因为它对于小纳米泡。通过AIP发布发布。

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