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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Effect of Micro- and Nanobubbles on the Crystallization of THF Hydrate Based on the Observation by Atomic Force Microscopy
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Effect of Micro- and Nanobubbles on the Crystallization of THF Hydrate Based on the Observation by Atomic Force Microscopy

机译：微量和纳米泡对THF水合物结晶的影响，基于原子力显微镜观察

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摘要

The air micro- and nanobubbles on a silicon wafer surface, generated by ethanol-water exchange method in THF solution, are found with anomalous small contact angles on the gas side due to the pinning effect. As the pinning effect is only with the limited region of a bubble and varies with bubble size, the difference in contact angle between the microbubbles and nanobubbles is recognized. With a high-resolution atomic force microscopy, in situ direct observations of THF hydrate nucleation are performed in the presence of air micro- and nanobubbles in solution. On the basis of the observations, the sizes of the hydrate crystallites along the bubble edge are much larger than those in nonbubble regions, which can be explained by the lower nucleation barrier at the contact line region as to the classical nucleation theory. The growth of hydrate crystals at the bubble contact line experiences the competition for THF molecules, probably through Oswald ripening process, resulting in the spaced distribution of THF hydrate crystallites along the bubble edge.
机译：在THF溶液中由乙醇 - 水交换方法产生的硅晶片表面上的空气和纳米泡，由于循环效果，气体侧的异常小接触角。由于钉扎效果仅伴有气泡的有限区域并且随气泡尺寸而变化，因此识别微泡和纳米泡之间的接触角的差异。利用高分辨率原子力显微镜，原位观察THF水合物成核在溶液中的空气微盐和纳米泡的存在下进行。在观察结果的基础上，沿着气泡边缘的水合物微晶的尺寸远大于非柔软区域中的尺寸，这可以通过接触线区域的较低成核屏障来解释至经典核心理论。泡沫接触线的水合物晶体的生长经历了THF分子的竞争，可能是通过溶血性熟化过程，导致沿着气泡边缘的THF水合物微晶的间隔分布。

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