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Temperature and size-dependent Hamaker constants for metal nanoparticles

机译:金属纳米粒子的温度和尺寸相关的Hamaker常数

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Theoretical values of the Hamaker constant have been calculated for metal nanoparticles using Lifshitz theory. The theory describes the Hamaker constant in terms of the permittivity of the interacting bodies. Metal nanoparticles exhibit an internal size effect that alters the dielectric permittivity of the particle when its size falls below the mean free path of the conducting electrons. This size dependence of the permittivity leads to size-dependence of the Hamaker constant for metal nanoparticles. Additionally, the electron damping and the plasma frequency used to model the permittivity of the particle exhibit temperature-dependence, which lead to temperature dependence of the Hamaker constant. In this work, both the size and temperature dependence for gold, silver, copper, and aluminum nanoparticles is demonstrated. The results of this study might be of interest for studying the colloidal stability of nanoparticles in solution.
机译:已使用Lifshitz理论计算了金属纳米粒子的Hamaker常数理论值。该理论用相互作用体的介电常数描述了Hamaker常数。金属纳米粒子表现出内部尺寸效应,当其尺寸降到导电电子的平均自由程以下时,该效应会改变粒子的介电常数。介电常数的这种尺寸依赖性导致金属纳米粒子的Hamaker常数的尺寸依赖性。另外,用于对粒子的介电常数进行建模的电子阻尼和等离子体频率表现出温度依赖性,这导致了Hamaker常数的温度依赖性。在这项工作中,金,银,铜和铝纳米粒子的尺寸和温度依赖性都得到了证明。这项研究的结果可能对研究纳米粒子在溶液中的胶体稳定性感兴趣。

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