Tyagi Sidhanth, Monteux Cécile, Deville Sylvain
Laboratoire de Synthèse et Fonctionnalisation des Céramiques, UMR 3080 CNRS/Saint-Gobain CREE, Saint-Gobain Research Provence, Cavaillon, France.
Sciences et Ingénierie de la Matiére Molle, ESPCI Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ Paris 06, Paris, France.
Sci Rep. 2021 Feb 10;11(1):3513. doi: 10.1038/s41598-021-82713-3.
The interaction of objects suspended in a liquid melt with an advancing solidification front is of special interest in nature and engineering sciences. The front can either engulf the object into the growing crystal or repel it. Therefore, the object-front confrontation can have a strong influence on the microstructure and mechanical or functional properties of the solidified material. The past theoretical models and experimental studies have mostly investigated the interaction of isolated, spherical, and hard objects in pure melts. However, the outcome of object-front interactions in complex (more realistic) systems, where multiple objects and solutes are present, is still poorly understood. Here we show the interaction of multiple oil droplets with an ice-water front in the absence and presence of solute effects using in situ cryo-confocal microscopy. We report on how the object size, number of objects, and bulk solute concentration influence the the object-front interaction and the front morphology, as well as the subsequent object spatial distribution. We suggest that the volume fraction of objects suspended in a liquid melt in conjunction with the amount of bulk solute concentration are two important parameters to be incorporated in the development of object-front interaction models.
悬浮在液态熔体中的物体与推进的凝固前沿之间的相互作用在自然科学和工程科学中具有特殊意义。该前沿既可以将物体吞没到正在生长的晶体中，也可以将其排斥。因此，物体与前沿的对抗会对凝固材料的微观结构以及力学或功能特性产生重大影响。过去的理论模型和实验研究大多考察了纯熔体中孤立的、球形的硬物体之间的相互作用。然而，在存在多个物体和溶质的复杂（更现实）系统中，物体与前沿相互作用的结果仍知之甚少。在此，我们利用原位低温共聚焦显微镜展示了在不存在和存在溶质效应的情况下多个油滴与冰水前沿之间的相互作用。我们报告了物体尺寸、物体数量和整体溶质浓度如何影响物体与前沿的相互作用、前沿形态以及随后的物体空间分布。我们认为，悬浮在液态熔体中的物体的体积分数以及整体溶质浓度是物体与前沿相互作用模型开发中需要纳入的两个重要参数。
