Anomalous solid-like necking of confined water outflow in hydrophobic nanopores
Anomalous solid-like necking of confined water outflow in hydrophobic nanopores
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DOI：
10.1016/j.matt.2021.11.023
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发表时间：
2022-01-05
期刊：
影响因子：
18.9
通讯作者：
Xu, Baoxing
中科院分区：
文献类型：
--
作者：
Gao, Yuan;Li, Mingzhe;Xu, Baoxing
液体侵入疏水性纳米孔产生了经典理论无法完全描述的不寻常的流体和传输特性，并且其挤出仍然在很大程度上是神秘的。在这里，我们报告说，承压水从疏水性纳米孔的流出表现出异常颈缩现象，随后发生断裂，类似于单轴张力下的固体金属纳米线。分子动力学模拟表明，这种类似固体的行为归因于水分子的强大内聚力以及与氢键网络和偶极子排列相关的纳米孔限制。通过建立流出变形和强度的类固体力学标度定律，定量描述提取的弹性模量和破坏强度。对疏水性纳米孔/水系统进行了准静态实验，并证实了流出变形和强度的标度规律与理论预测非常一致。这项研究通过利用其前所未有的类固体流出行为，为探测纳米限制液体的机械和结构特性提供了一种简便的途径。
Intrusion of liquid into hydrophobic nanopores has yielded unusual fluid and transport properties that classical theories cannot fully describe, and its extrusion yet remains largely mysterious. Here, we report that the outflow of confined water from hydrophobic nanopores exhibits an anomalous necking phenomenon followed by its breaks, similar to that of solid metal nanowires under uniaxial tension. Molecular dynamics simulations reveal that this solid-like behavior attributes to strong cohesions of water molecules and nanoporous confinements associated with hydrogen-bonding networks and dipole alignments. The extracted elastic modulus and failure strength are quantitatively described by establishing solid-like mechanics scaling laws of outflow deformation and strength. Quasi static experiments on hydrophobic nanopores/water systems were performed and confirmed the scaling laws of both outflow deformation and strength in remarkable agreement with theoretical predictions. This study offers a facile route for probing mechanical and structural properties of nanoconfined liquid by leveraging its unprecedented solid-like outflow behavior.