论文标题
低体积分数中的超级arrhenius扩散在二元胶体混合物中：由于不对称屏障而导致的耗尽相互作用的影响
Super-Arrhenius diffusion in a binary colloidal mixture at low volume fraction: an effect of depletion interaction due to an asymmetric barrier
论文作者
论文摘要
我们报告了沿低体积分数以空间方向的外部电势屏障对二元胶体混合物的分子动力学模拟的结果，ϕ = 0.2。外部电势屏障的不对称性变化不会改变较小颗粒的动力学，显示出Arrhenius扩散。然而，较大颗粒的动力学显示出从sub-arrhenius到超级阿尔希尼乌斯扩散的交叉，在低温下外部电势的不对称性和低体积分数。通常在高密度系统中观察到超级arrhenius扩散，在高密度系统中，由于密集的堆积，例如，超冷的液体，超冷的液体，堵塞系统，通过多孔膜的扩散，细胞环境中的动态性等等。
We report results from the molecular dynamics simulations of a binary colloidal mixture subjected to an external potential barrier along one of the spatial directions at low volume fraction, ϕ = 0.2. The variations in the asymmetry of the external potential barrier do not change the dynamics of the smaller particles, showing Arrhenius diffusion. However, the dynamics of the larger particles shows a crossover from sub-Arrhenius to super-Arrhenius diffusion with the asymmetry in the external potential at the low temperatures and low volume fraction. Super-Arrhenius diffusion is generally observed in the high density systems where the transient cages are present due to dense packing, e.g., supercooled liquids, jammed systems, diffusion through porous membranes, dynamics within the cellular environment, etc. This model can be applied to study the molecular transport across cell membranes, nano-, and micro-channels which are characterized by spatially asymmetric potentials.
