arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2203.09568cond-mat.soft
收藏

多孔介质中二元液体的相分离及老化动力学

Phase separation and aging dynamics of binary liquid in porous media

Rounak Bhattacharyya, Bhaskar Sen Gupta

摘要:

我们采用最先进的分子动力学模拟研究相分离的动力学和老化现象的二元流体混合物吸入多孔材料。不同的随机多孔结构被认为是了解粗化动力学上的孔形态的效果。我们发现复杂的几何约束的影响,导致显着放缓的相分离动力学。畴生长遵循幂律,其指数依赖于多孔基质结构。在过渡期之后,当域尺寸变得与孔尺寸相当时,观察到向较慢域生长的交叉。由于几何约束的存在,关联函数和结构因子都发生了非Porod行为,违反了超普适性假设。通过计算二次序参量自相关函数,定性研究了多孔基体结构对非平衡时效动力学的影响。这个量表现出的比例律相对于在观察时间和年龄的系统的域长度的比率。我们发现标度律适用于这种封闭的分离流体混合物。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑