论文标题
粘弹性的准2D泡沫
Viscoelastic coarsening of quasi-2D foam
论文作者
论文摘要
泡沫是不稳定的材料。它们随着时间尺度与“使用时间”相媲美的时间而发展，这使得其对应用至关重要的不稳定机制的研究。实际上，许多泡沫是由粘弹性流体制成的，这些泡沫可以延长它们的寿命。尽管它们的重要性，但我们对此类系统中的粗化机制缺乏了解。我们探测连续相粘弹性对用泡沫乳液变色的泡沫的影响。我们表明，气泡尺寸的演化强烈减慢，泡沫结构受到了巨大影响。负责的主要机制是没有连续的相位重新分布以及泡沫结构与机械性能之间的非平凡联系。这些结合以使空间异质变质。除了它们在泡沫材料的设计中的重要性之外，结果还提供了粘弹性介质中相位分离的宏观视野。
Foams are unstable jammed materials. They evolve over timescales comparable to their "time of use", which makes the study of their destabilisation mechanisms crucial for applications. In practice, many foams are made from viscoelastic fluids, which are observed to prolong their lifetimes. Despite their importance we lack understanding of the coarsening mechanism in such systems. We probe the effect of continuous phase viscoelasticity on foam coarsening with foamed emulsions. We show that bubble size evolution is strongly slowed down and foam structure hugely impacted. The main mechanisms responsible are the absence of continuous phase redistribution and a non-trivial link between foam structure and mechanical properties. These combine to give spatially heterogeneous coarsening. Beyond their importance in the design of foamy materials, the results give a macroscopic vision of phase separation in a viscoelastic medium.
