Dynamics of interfaces on fluid systems with large fluctuations

本文利用动态光散射方法研究了室温离子液体（RTIL）等波动较大的液体表面的表面波。我们发现，表面波的RTIL系统的库仑和货车德瓦尔斯相互作用的影响。我们还发现RTIL上的表面波从阻尼振荡转变为过阻尼行为。我们首次观察到过阻尼区的快阻尼模和慢阻尼模以及临界阻尼附近阻尼振子区的体剪切模。此外，我们还对粘弹性液体表面的表面波进行了理论研究，详细地揭示了毛细波和弹性波模式之间的交叉以及它们之间的色散关系。

We studied surface waves on the liquids with large fluctuations, such as room temperature ionic liquids (RTILs), by using dynamic light scattering. We found that the surface waves on RTILs are systematically affected by both Coulomb and van der Waals interactions. We also found that the surface waves on RTILs transform from damped oscillation to overdamped behavior. We observed for the first time the fast and the slow damping modes in the overdamped region and bulk shear mode in the damped oscillator region near the critical damping. In addition, we studied the surface waves on the viscoelastic liquids theoretically, and details of the cross over between the capillary waves and the elastic wave modes and their dispersion relations were made clear.