论文标题
弹性对异质系统相位分离的影响
Effect of Elasticity on Phase Separation in Heterogeneous Systems
论文作者
论文摘要
最近的一项研究表明，在存在弹性网络的情况下，二元液体混合物中的相分离被捕，并可能导致稀阶段液滴的几乎均匀尺寸的分布。在较长的时间尺度上，这些液滴表现出沿弹性特性梯度迁移的方向偏好，形成溶解液滴的前部[K.。 A. Rosowski，T。Sai，E。Vidal-Henriquez，D。Zwicker，R。W。Style，E。R。Dufresne，弹性成熟和抑制液 - 液相分离，自然物理学（2020）1-4]。在这项工作中，我们通过采用一种基于能量的方法来捕获短时间和长时间尺度上的过程来确定本构的灵敏度和最终前面传播的动力学，从而在非线性弹性固体中对这种现象进行了完整的理论理解。我们量化了热力学驱动力，以识别前传播中的扩散限制和溶解的限制度。我们表明，弹性特性的变化对过程具有非线性影响。这种强大的影响可能对包括食物，金属和水生沉积物在内的多种材料系统具有影响，并进一步证实了这样一个假设，即生物系统利用这种机制来调节重要功能。
A recent study has demonstrated that phase separation in binary liquid mixtures is arrested in the presence of elastic networks and can lead to a nearly uniformly-sized distribution of the dilute-phase droplets. At longer timescales, these droplets exhibit a directional preference to migrate along elastic property gradients to form a front of dissolving droplets [K. A. Rosowski, T. Sai, E. Vidal-Henriquez, D. Zwicker, R. W. Style, E. R. Dufresne, Elastic ripening and inhibition of liquid-liquid phase separation, Nature Physics (2020) 1-4]. In this work, we develop a complete theoretical understanding of this phenomenon in nonlinear elastic solids by employing an energy-based approach that captures the process at both short and long timescales to determine the constitutive sensitivities and the dynamics of the resulting front propagation. We quantify the thermodynamic driving forces to identify diffusion-limited and dissolution-limited regimes in front propagation. We show that changes in elastic properties have a nonlinear effect on the process. This strong influence can have implications in a variety of material systems including food, metals, and aquatic sediments, and further substantiates the hypothesis that biological systems exploit such mechanisms to regulate important function.
