首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Molecular Dynamics Simulation Study of Self-Assembled Monolayers of Alkanethiol Surfactants on Spherical Gold Nanoparticles
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Molecular Dynamics Simulation Study of Self-Assembled Monolayers of Alkanethiol Surfactants on Spherical Gold Nanoparticles

机译:球形金纳米粒子表面活性剂自组装单分子层的分子动力学模拟研究

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摘要

Atomistic molecular dynamics (MD) simulations of self-assembled alkanethiol monolayers are performed toinvestigate the ligand shell organization of homoligand surfactants on spherical gold nanoparticle surfaces as a function of temperature,nanoparticle size,and ligand tail length.At high temperature,we show that the ligands orient randomly with respect to the surface normal with a small tilt angle.As the temperature decreases, the molecules order and adopt a larger tilt angle.The effects of alkanethiol tail length and nanoparticle size on the tilt structure are also significant.At low temperature,we find the equilbrium conformation of alkanethiols obeys the crystallographic model,whereas at high temperature the continuous model is valid.The dependence of tilt angle on different parameters and comparison with self-assembled monolayers on flat surfaces are also discussed.
机译:进行了自组装烷硫醇单分子层的原子分子动力学(MD)模拟,以研究球形金纳米粒子表面上均配体表面活性剂的配体壳组织与温度,纳米颗粒大小和配体尾长的关系。在高温下,我们表明配体相对于表面法线随机以小倾角取向。随着温度降低,分子有序排列并采用更大的倾角。烷硫醇尾长和纳米颗粒尺寸对倾斜结构的影响也很明显。我们发现链烷硫醇的平衡构型符合晶体学模型,而在高温下连续模型是有效的。

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