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MOLECULAR DYNAMICS STUDIES OF LANGMUIR MONOLAYERS OF F(CF2)(20)F

机译:F(CF2)(20)F的朗缪尔单分子层的分子动力学研究

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We report the results of molecular dynamics simulations of Langmuir monolayers of F(CF2)(20)F using both a united atom model and a recently developed anisotropic united atom model of the molecular force field. A comparison of our simulation results to experimental measures of the structure of Langmuir monolayers and lamellar crystals of F(CF2)(20)F indicates that the anisotropic united atom model provides the better representation. Simulations using the new model at 275 K generate an azimuthally disordered rotator phase monolayer, while simulations at 150 K generate a monolayer phase with azimuthal order. The relative intensities of peaks in the in-plane structure function can be used to distinguish between the azimuthally ordered and disordered phases. Our simulations also predict, in agreement with experiment, that at large average areas per molecule the monolayer breaks up into islands that have a close-packed structure at the center but are disordered at the periphery. (C) 1996 American Institute of Physics. [References: 23]
机译:我们报告的F(CF2)(20)F Langmuir单分子层的分子动力学模拟结果使用联合原子模型和最近开发的分子力场的各向异性联合原子模型。我们的仿真结果与F(CF2)(20)F的Langmuir单层和层状晶体结构的实验测量结果的比较表明,各向异性联合原子模型提供了更好的表示。使用该新模型在275 K下进行的仿真会生成一个方位无序的转子相单层,而在150 K下的仿真会生成一个具有方位角序的单层相。平面内结构函数中峰的相对强度可用于区分方位有序相和无序相。我们的模拟还与实验相一致地预测,在每个分子的平均面积较大的情况下,单分子层会分裂成岛,岛的中心具有紧密堆积的结构,而外围则无序。 (C)1996年美国物理研究所。 [参考:23]

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