论文标题
多孔培养基中二元液体的相分离和老化动力学
Phase separation and aging dynamics of binary liquid in porous media
论文作者
论文摘要
我们采用最先进的分子动力学模拟来研究相位分离和衰老现象的动力学，这些二元液体混合物被吸收到多孔材料中。不同的随机多孔结构被认为了解孔形态对变形动力学的影响。我们发现复杂的几何限制的效果导致相位分离动力学的急剧减慢。域的增长遵循幂定律，指数取决于多孔宿主结构。瞬态之后，当域大小与孔径相当时，观察到较慢的域生长。由于几何限制，相关函数和结构因子因非武器行为而修改并违反了超级词性假设。通过计算两次订单参数自相关函数，对多孔宿主结构在非平衡衰老动力学上的作用进行了定性研究。该数量在观察时间和系统年龄时就域长度的比率表现出缩放定律。我们发现缩放定律适合这种狭窄的分离流体混合物。
We employ the state-of-the-art molecular dynamics simulations to study the kinetics of phase separation and aging phenomena of segregating binary fluid mixtures imbibed in porous materials. Different random porous structures are considered to understand the effect of pore morphology on coarsening dynamics. We find the effect of complex geometrical confinement resulting in the dramatic slowing down in the phase separation dynamics. The domain growth follows the power law with an exponent dependent on the porous host structure. After the transient period, a crossover to a slower domain growth is observed when the domain size becomes comparable to the pore size. Due to the geometric confinement, the correlation function and structure factor modify to a non-Porod behavior and violate the superuniversality hypothesis. The role of porous host structure on the nonequilibrium aging dynamics is studied qualitatively by computing the two-time order-parameter autocorrelation function. This quantity exhibits scaling laws with respect to the ratio of the domain length at the observation time and the age of the system. We find the scaling laws hold good for such confined segregating fluid mixtures.
