粘性液体中引力的非微扰效应
Nonperturbative effect of attractive forces in viscous liquids
摘要：
我们研究的作用，吸引分子间力的粘性制度的一个简单的玻璃形成液体通过使用计算机模拟。为此，我们比较了一个标准的Lennard-Jones玻璃形成液体模型的结构和动力学与没有吸引力的相互作用势的尾巴。两个系统的粘性慢化被发现是定量和定性的不同，在一个广泛的密度范围内，而静态对相关性保持密切。常见的假设，即稠密的非缔合液体的行为是由短程排斥部分的分子间的潜力显着打破了在粘性液体制度的松弛。
英文摘要：
We study the role of the attractive intermolecular forces in the viscous regime of a simple glass-forming liquid by using computer simulations. To this end, we compare the structure and the dynamics of a standard Lennard-Jones glass-forming liquid model with and without the attractive tail of the interaction potentials. The viscous slowing down of the two systems are found to be quantitatively and qualitatively different over a broad density range, whereas the static pair correlations remain close. The common assumption that the behaviour of dense nonassociated liquids is determined by the short-ranged repulsive part of the intermolecular potentials dramatically breaks down for the relaxation in the viscous liquid regime.
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