Klopp Christoph, Trittel Torsten, Stannarius Ralf
Otto von Guericke University Magdeburg, Institute of Physics, Universtiätsplatz 2, D-39106, Magdeburg, Germany.
Otto von Guericke University Magdeburg, MARS, D-39106, Magdeburg, Germany.
Chemphyschem. 2024 Jun 17;25(12):e202400166. doi: 10.1002/cphc.202400166. Epub 2024 Apr 25.
We study the coarsening behavior of assemblies of islands on smectic A freely suspended films in ISS microgravity experiments. The islands can be regarded as liquid inclusions in a two-dimensional fluid in analogy to liquid droplets of the discontinuous phase of an emulsion. The coarsening is effectuated by two processes, predominantly by island coalescence, but to some extend also by Ostwald ripening, whereby large islands grow at the expense of surrounding smaller ones. A peculiarity of this system is that the continuous and the discontinuous phases consist of the same material. We determine the dynamics, analyze the self-similar aging of the island size distribution and discuss characteristic exponents of the mean island growth.
我们在国际空间站微重力实验中研究了近晶A自由悬浮膜上岛状聚集体的粗化行为。这些岛状聚集体可被视为二维流体中的液体夹杂物，类似于乳液不连续相中的液滴。粗化过程由两个过程导致，主要是岛状聚集体的合并，但在一定程度上也由奥斯特瓦尔德熟化导致，即大的岛状聚集体以周围较小的岛状聚集体为代价生长。该系统的一个特殊之处在于连续相和不连续相由相同的材料组成。我们确定了动力学，分析了岛尺寸分布的自相似老化，并讨论了平均岛生长的特征指数。
