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在石墨烯纳米毛细管中的方形冰

G Algara-Siller¹, O Lehtinen¹, F C Wang²

¹Central Facility for Electron Microscopy, Group of Electron Microscopy of Materials Science, University of Ulm, 89081 Ulm, Germany.

|March 27, 2015

概括

研究人员发现了一种新的冰相,称为"方形冰",由水被限制在石墨烯板之间形成. 这一新阶段表现出独特的结构,与典型的冰不同,影响了纳米技术和材料科学.

科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
物理化学物理化学

背景情况:

水存在于各种散装阶段,包括六角冰,以及在接口上吸附的或受孔限制的低维形式.
封闭式水在各种科学领域发挥着至关重要的作用,但其实验性结构分析仍然具有挑战性.
恐水性封闭是一个关键的环境,其中独特的水相可能形成.

研究的目的:

实验性地研究水的水纳米通道内的水晶结构.
在环境条件下描述纳米封闭水的相位和对称性.

主要方法:

使用高分辨率电子显微镜,在两个石墨烯板之间绘制水的图像.
进行了分子动力学模拟,以支持实验观测和探索相位行为.

主要成果:

观察一种新型的冰相,称为"方块冰",由室温的纳米水形成.
方形冰表现出与常规冰不同的一种对称性,其包装密度高,晶格常数为2.83 Å.
该相可以组装成双层和三层结晶体,并预测在各种疏水纳米通道中保持稳定.

结论:

实验成像和模拟证实了水限制下的方形冰的存在.
这一发现揭示了水的新基本阶段,对理解纳米环境中的水行为有重大影响.
方形冰的发现为操纵纳米材料和相关应用中的水特性打开了道路.

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