We use molecular simulations to demonstrate the formation of a vacuum layer around a vibrating nanoparticle in a liquid. This vacuum layer forms readily for high frequencies with respect to the characteristic vibrational (Einstein) frequency of the fluid, even with small amplitude vibrations. The opposite is true for low frequencies, where large amplitudes are required to demonstrate the vacuum layer. With the vacuum layer forming, the quality factor of the oscillations increases substantially. The findings provide an interpretation of our recent experiments that show the onset of high-quality resonances of nanoparticles in water (Xiang et al. Nano Lett. 2016, 16, 3638) in the gigahertz to terahertz range.

中文翻译：

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纳米级太赫兹振动期间的去湿

我们使用分子模拟来证明在液体中振动纳米粒子周围形成真空层。相对于流体的特征振动（爱因斯坦）频率而言，即使在振幅较小的情况下，该真空层也易于形成高频。相反的情况对于低频来说是正确的，在低频情况下，需要大的幅度来展示真空层。随着真空层的形成，振荡的品质因数大大提高。这些发现为我们最近的实验提供了解释，这些实验显示了水中纳米粒子的高质量共振的发生（翔等。纳米莱特。 2016，16，3638）在千兆赫至太赫兹范围内。