基于应力网络的汽液界面内在脆弱性研究
The Intrinsic Fragility of the Liquid-Vapor Interface: A Stress Network Perspective
摘要：
采用内禀采样方法，用分子动力学模拟研究了Lennard-Jones流体汽液界面的演化。结果表明，与毛细波理论，明确阻尼的密度分布随着温度的增加。我们确定了一个线性变化的空间填充性质（分形维数）的应力簇的内在表面与增加表面张力，或等效地，随着温度的降低。对这些应力网络的逾渗分析表明，在较高的温度下，应力场更加脱节。这导致界面更加脆弱，从而导致较高温度下的表面张力降低。
英文摘要：
The evolution of the liquid-vapour interface of a Lennard-Jones fluid is examined with molecular dynamics simulations using the intrinsic sampling method. Results suggest, in agreement with capillary wave theory, clear damping of the density profiles as the temperature is increased. We identify a linear variation of the space-filling nature (fractal dimension) of the stress-clusters at the intrinsic surface with increasing surface tension, or equivalently, with decreasing temperature. A percolation analysis of these stress networks indicates that the stress field is more disjointed at higher temperatures. This leads to more fragile interfaces that result in a reduction in surface tension at higher temperature.
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