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在现场观测软X射线触发的超碳微滴中纳米级相变的微观观察

Yuwen Ji¹, Yao Wang², Mingzheng Fang³

¹Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China; University of Chinese Academy of Sciences, Beijing 100049, China; Gulliver CNRS UMR 7083, PSL Research University, ESPCI Paris, 10 rue Vauquelin, 75005 Paris, France.

Journal of colloid and interface science

|July 13, 2025

概括

研究人员使用先进的显微镜观察了微滴中纳米泡的形成. 滴滴大小影响相位过渡,接口在纳米泡核形成中发挥着关键作用.

科学领域:

物理化学物理化学
材料科学材料科学材料科学
纳米技术纳米技术

背景情况:

微尺度液态气相过渡在自然界和工业中至关重要.
了解无形中间状态是阶段过渡机制的关键.
现有的技术缺乏在现场观察亚微米现象的分辨率.

研究的目的:

研究微滴中纳米泡 (NBs) 的形成和演变.
阐明尺寸效应和界面现象在相变中的作用.
克服传统方法观察纳米级相变的局限性.

主要方法:

利用扫描传输软X射线显微镜 (STXM) 与同步辐射.
在 perfluorohexane (PFH) 微滴 (<10μm) 中实现了高分辨率的纳米泡生长现场观测.
分析了液滴大小和气液界面对核化动态的影响.

主要成果:

经过证明的大小依赖的相位过渡动态:促进然后抑制随着滴滴大小的减少.
在1μm左右的微滴中观察到独特的批量蒸发行为.
与散装区域相比,在气液界面发现了显著更高的纳米泡核化率.

结论:

接口效应极大地影响了纳米泡核化动态.
尺寸效应在微滴相位过渡中起着复杂的作用.
这些发现挑战了关于大小依赖的界面现象的传统假设,并对药物输送和环境修复产生影响.

关键词:

微小的微粒,就是微小的微粒.这是一个纳米泡.perfluorocarbon 是一种多碳化合物.阶段过渡阶段过渡这是软X射线.

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Scanning Electron Microscopy

Scanning Electron Microscopy

A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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