蒸发液滴内的相分离爆发与对称性破缺：花状图案的形成
Phase separation bursting and symmetry breaking inside an evaporating droplet; formation of a flower-like pattern
AI总结：
本研究发现含盐与非离子聚合物的蒸发液滴中微米颗粒形成花状沉积图案，揭示盐析引发的聚合物相分离产生相分离爆发流导致轴对称破缺，为相分离流体物理及相关技术应用提供新见解。
摘要：
液相内部的图案形成是地球生命诸多不同方面都涉及的一种现象。蒸发过程中的液态液滴会呈现出依赖于液滴化学性质及相关物理参数的图案。我们观察到，含盐和非离子聚合物的液滴蒸发后，微米级颗粒形成了花状沉积图案。我们通过实验证明，盐析效应导致的聚合物相分离会引发强烈的熵流，表现为涡旋形式。这种流动被称为相分离爆发流，它会导致轴对称性破缺，并形成径向排列的花状图案。我们预计，理解所观察到的这种流动有助于深入认识相分离的流体物理特性，并且可能对技术应用具有启示意义。
英文摘要：
Pattern formation inside a liquid phase is a phenomenon involved in many different aspects of life on our planet. The droplet form of a liquid that evaporates can reveal patterns that depend on the chemistry of the droplet and the physical parameters involved. We observed a flower-like deposition pattern of micrometer-sized particles as a result of the evaporation of a droplet containing salt and a non-ionic polymer. We show experimentally that the phase separation of the polymer due to the salting-out effect causes a strong entropic flow, which manifests as vortices. The flow is called phase separation bursting flow, which leads to the axial symmetry breaking and the formation of a radially aligned flower-like pattern. We foresee that understanding the observed flow can provide insights into the fluid physics aspects of phase separation and may have implications for technical applications.
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