论文标题
表面活性剂对液体液体界面弹性的影响
Effect of surfactants on the elasticity of the liquid--liquid interface
论文作者
论文摘要
我们通过分子动力学模拟研究了表面活性剂对两种液体之间界面的影响。我们采用了带有两个原子作为表面活性剂的简单珠子弹簧模型。我们通过更改键长的长度来控制表面活性剂吸附的表面活性剂的界面张力。尽管界面的结构取决于界面张力的大小，但即使在界面张力几乎为零的条件下，界面也是稳定的。当界面张力几乎为零时，表面结构波动的傅立叶光谱从$ q^2 $到$ q^4 $的交叉频谱显示，其中$ q $是vavenumber。这种交叉意味着，当表面活性剂分子足够吸收到界面上并且界面张力几乎为零时，弯曲刚度是恢复力的主导性，而当界面张力是界面张力时，当界面张力是有限值时的主流。
We investigated the effect of surfactants on an interface between two kinds of liquid by molecular dynamics simulation. We adopted the simple bead-spring model with two atoms as the surfactants. We controlled the interfacial tension of the surfactant adsorbed on the interface by changing the bond length. Although the interface's structure changed depending on the magnitude of the interfacial tension, the interface was stable even under conditions where the interfacial tension was virtually zero. The Fourier spectrum of the fluctuations of the surface structure showed a crossover from $q^2$ to $q^4$ when the interfacial tension was almost zero, where $q$ is the wavenumber. This crossover means that the bending rigidity is dominant for the restoring force when the surfactant molecules are sufficiently absorbed on the interface and the interfacial tension is almost zero, whereas the interfacial tension is dominant when the interfacial tension is a finite value.
