Assessment of Pressure and Density of Confined Water in Graphene Liquid Cells
Assessment of Pressure and Density of Confined Water in Graphene Liquid Cells
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DOI：
10.1002/admi.201901727
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发表时间：
2020-05
影响因子：
5.4
通讯作者：
S. Ghodsi;Soroosh Sharifi‐Asl;P. Řehák;P. Král;C. Megaridis;R. Shahbazian‐Yassar;T. Shokuhfar
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文献类型：
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作者：
S. Ghodsi;Soroosh Sharifi‐Asl;P. Řehák;P. Král;C. Megaridis;R. Shahbazian‐Yassar;T. Shokuhfar
由于各种因素的相互作用，理解范德华(VDW)材料中受限物质的行为是复杂的，这些因素包括VDW之间的相互作用、层与物质的相互作用以及层的弯曲应变能以适应封装。在这里，对VDW材料中封闭空间内的水的压力和密度的大小提供了新的见解。这是通过在像差校正的扫描电子显微镜中研究两片石墨烯薄膜之间包裹的水的等离子体激发来实现的。结果表明，在石墨烯密闭的情况下，水的密度最大增加了12%，预计压力可高达400Mpa。考虑VDW力、拉普拉斯压力和应变能影响的理论分析结果与实验结果吻合较好。这项工作的发现开启了新的机会，不仅可以探索水的局部物理状态，还可以探索高压下其他液体材料的物理状态，成像和分析分辨率以前从未实现过。
Understanding the behavior of confined matter within Van der Waals (VdW) materials is complicated due to the interplay of various factors, including the VdW interaction between the interlayers, the layer interaction with the matter, and the bending strain energy of the layers to accommodate encapsulation. Herein, new insight on the magnitude of pressure and density of water entrapped within confined spaces in VdW materials is provided. This is accomplished by studying the plasmon excitation of water encapsulated between two sheets of graphene membranes in an aberration‐corrected scanning transmission electron microscope. The results indicate ≈12% maximum increase in the density of water under tight graphene encasement, where pressure as high as 400 MPa is expected. The pressure estimation from theoretical analysis considering the effect of VdW forces, Laplace pressure, and strain energy is in agreement with the experimental results. The findings of this work open new opportunities to explore the local physical state of not only water but also other liquid materials under high pressure with imaging and analytical resolutions never achieved before.