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The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
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在原子尺度限制下的毛细血管凝结

Qian Yang1,2, P Z Sun3,4, L Fumagalli4

  • 1National Graphene Institute, University of Manchester, Manchester, UK. qian.yang-2@manchester.ac.uk.

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此摘要是机器生成的。

凯尔文方程准确地描述了原子级毛细血管中的水凝结,即使这些毛细血管只有一个水层. 这令人惊的发现是由于毛细血管壁的变形, 而不是宏观模型的崩.

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科学领域:

  • 物理化学
  • 材料科学
  • 纳米技术

背景情况:

  • 水的毛细血管凝结在自然和工业中至关重要, 影响粘附和滑等特性.
  • 凯尔文方程广泛用于凝结,但预计在纳米级毛细血管中会失败.
  • 对于许多技术应用来说,了解分子水平的凝结是至关重要的.

研究的目的:

  • 研究原子级毛细血管中的水凝结,特别是预测凯尔文方程分解的地方.
  • 在分子尺度上探索宏观凝结模型的有效性.
  • 阐明限制环境中的毛细血管凝结机制.

主要方法:

  • 使用范德瓦尔斯的二维晶体组合来创建原子尺度的毛细血管.
  • 研究了毛细血管中的水凝结,高度小于四英尺.
  • 使用实验技术观察和分析凝结过渡.

主要成果:

  • 宏观的凯尔文方程准确地描述了在原子尺度上的水友性毛细血管中的水凝结.
  • 凯尔文方程对于弱水友性 (石墨) 毛细血管仍然具有质量.
  • 观察到毛细血管壁的弹性变形抑制了预期的分子级振荡行为.

结论:

  • 凯尔文方程在原子尺度上的准确性是偶然的,由毛细血管壁弹性解释.
  • 宏观模型可以令人惊地描述极其狭窄的空间中的凝结.
  • 这项研究促进了对毛细血管现象的理解,