表面张力
范德瓦尔斯力
钠
硫酸钠
化学
力场(虚构)
相(物质)
肺表面活性物质
化学物理
硫酸盐
十二烷基硫酸钠
分子
水溶液
分析化学(期刊)
热力学
物理化学
色谱法
有机化学
物理
量子力学
生物化学
作者
Tao Cheng,Qing Chen,Feng Li,Huai Sun
摘要
A classical force field capable for accurately predicting surface tensions, surface concentration, and other interfacial properties is reported for sodium dodecyl sulfate (SDS). This force field is proposed by combining parameters from well established force fields for components of the air/SDS/water interface and optimized by adjusting the van der Waals diameter of sulfate oxygen to fit experimental data of surface tension. The force field parameters are transferable; as good agreement with experimental data is achieved from independent calculations on activity derivatives of aqueous solution of sodium methyl sulfate using the Kirkwood−Buff theory. The adjusted parameter effectively modulates the electrostatic interactions of solvated ions in solutions. This modification has a strong impact to surface tension and location and mobility of sodium cations but minimal impact to properties such as density profiles of bulk phase and conformations and orientations of surfactant chain, for which consistent results compared with previous studies are obtained.
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