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Long Distance Correlations in Molecular Orientations of Liquid Water and Shape Dependant Hydrophobic Force

机译:液态水和水的分子取向的长距离相关性   形状依赖的疏水力

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摘要

Liquid water, at ambient conditions, has short-range density correlationswhich are well known in literature. Surprisingly, large scale moleculardynamics simulations reveal an unusually long-distance correlation in`longitudinal' part of dipole-dipole orientational correlations. It isnon-vanishing even at 75 \AA{} and falls-off exponentially with a correlationlength of about 24 \AA{} beyond solvation region. Numerical evidence suggeststhat the long range nature of dipole-dipole correlation is due to underlyingfluctuating network of hydrogen-bonds in the liquid phase. This correlation isshown to give a shape dependant attraction between two hydrophobic surfaces atlarge distances of separation and the range of this attractive force is inagreement with experiments. In addition it is seen that quadrupolarfluctuations vanish within the first solvation peak (3 \AA{})
机译:在环境条件下,液态水具有短程密度相关性,这在文献中是众所周知的。出乎意料的是,大规模分子动力学模拟揭示了偶极-偶极取向相关性的“纵向”部分中异常长距离的相关性。即使在75 \ AA {}时,它也不会消失,并且在溶剂化区域以外以约24 \ AA {}的相关长度呈指数下降。数值证据表明,偶极子-偶极子相关性的长距离性质是由于液相中氢键的潜在波动网络所致。该相关性显示出在较大的分离距离下在两个疏水性表面之间提供了形状依赖性的吸引力,并且该吸引力的范围与实验不一致。此外,可以看到在第一个溶剂化峰(3 \ AA {})内四极波动消失了

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