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从液态水中结晶的冰的分子分辨率成像,采用冷液体细胞TEM

Jingshan S Du¹, Suvo Banik^2,3, Henry Chan²

¹Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA.

Nature communications

|September 25, 2025

概括

研究人员使用冷液体细胞传输电子显微镜 (CRYOLIC-TEM) 在分子水平上成像冰结晶缺陷. 这项技术揭示了像气泡这样的纳米尺度缺陷如何在冰层结构中形成和表现.

科学领域:

材料科学材料科学材料科学
物理化学物理化学
晶体学晶体学是指结晶学.

背景情况:

从液态水中获得结晶的冰的分子分辨率图像是具有挑战性的,因为样本准备困难.
以前的研究缺乏可视化冰结构中的纳米缺陷的分辨率.

研究的目的:

为了实现从液态水中结晶的冰的Å分辨率电子成像,I_h.
研究冰中的纳米尺度缺陷和微观结构的性质和行为.

主要方法:

制冷液体细胞传输电子显微镜 (CRYOLIC-TEM) 的开发.
网格映射与分子动力学模拟的结合.
在电子辐射下现场监测缺陷动态.

主要成果:

成功稳定并以 Å 分辨率对冰 I_h进行成像.
证明冰的形成可以容忍纳米尺度的缺陷,如误导的子域和气泡.
观测泡表面采用低能纳米面与最小的应变.
气泡核形成,生长,迁移,溶解和凝聚的动态过程的特征.

结论:

CRYOLIC-TEM能够在分子层面上对冰结晶产生前所未有的洞察力.
纳米尺度的缺陷由分子图案稳定,对晶体完整性影响最小.
了解缺陷动态对于理解水结晶至关重要.

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