守恒相分离中的边界驱动各向异性粗化
Boundary-Driven Anisotropic Coarsening in Conserved Phase Separation
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中文总结 AI 辅助
该研究针对含蒸发组分的三元混合物，发现边界强迫可打破守恒相分离的各向同性标度，引发平行与垂直边界方向不同的各向异性粗化，为调控非平衡相分离粗化行为提供新途径。
中文摘要 AI 辅助
守恒动力学系统中，相分离的通用标度通常被认为是各向同性的。本文表明，仅边界强迫即可打破这种动力学标度对称性，引发各向异性粗化，且平行和垂直于边界方向呈现不同的有效全局生长规律。我们考虑含两个守恒组分和一个发生表面蒸发的惰性组分的三元混合物，该体系为研究此效应提供了简单场景。此情况下，蒸发导致质量逐步损失并形成宏观浓度梯度，进而驱动各向异性粗化，平行和垂直于边界方向呈现不同的有效生长规律。同时，体相区域似乎保留标准Model B标度，表明观测到的各向异性主要由边界通量而非本征动力学变化诱导。我们的结果表明，边界条件在打破标度对称性中可发挥重要作用，或为影响非平衡相分离中的粗化行为提供一种途径。
英文摘要
Universal scaling in phase separation is typically assumed to be isotropic in systems with conserved dynamics. Here we show that boundary forcing alone can break this dynamical scaling symmetry, leading to anisotropic coarsening, with different effective global growth laws observed parallel and perpendicular to the boundary. We consider a ternary mixture with two conserved components and a passive species undergoing surface evaporation, which provides a simple setting to investigate this effect. In this case, evaporation leads to a progressive mass loss and to the formation of macroscopic concentration gradients, which, in turn, drive anisotropic coarsening, with different effective growth laws observed parallel and perpendicular to the boundary. At the same time, bulk regions appear to retain the standard Model B scaling, suggesting that the observed anisotropy is mainly induced by boundary fluxes rather than by changes in the intrinsic dynamics. Our results indicate that boundary conditions can play an important role in breaking scaling symmetry and may offer a way to influence coarsening behavior in nonequilibrium phase separation.
