圆柱形小集合体熔化过程中的形态转变
Morphological Transitions during Melting of Small Cylindrical Aggregates
摘要：
大多数关于约束条件下熔化的研究只集中在固体和液体熔体相。尽管其无处不在，从毛细界面（液体/蒸汽界面）的贡献往往被忽视。在这项研究中，小圆柱形聚集体在蒸汽中的熔化行为进行了分析。对于假定的边界条件（圆柱体，顶面不润湿，侧壁不润湿），固液两相在一定温度范围内可以共存。由于毛细管的不稳定性，液相可以形成轴对称的棒状形态，或者在一定的阈值液体体积分数以上，与棒状部分共存的凸起。相应的熔点不同。分析明确描述了一个真正的系统的小聚集体的长链烷烃平面基板上的行为。它还提供了定性的见解，一般具有各向异性润湿行为的小聚集体的熔融行为。它揭示了特别是如何熔点和熔化途径取决于充满活力的形态路径，导致完全熔化。
英文摘要：
Most studies on melting under confinement focus only on the solid and liquid melt phases. Despite of its ubiquity, contributions from the capillary interface (liquid / vapor interface) are often neglected. In this study the melting behavior of small cylindrical aggregates in vapor attached to planar surfaces is analyzed. For the assumed boundary conditions (cylindrical solid with a non wetting top plane and a wettable side wall) solid and the liquid phases can coexist within a certain temperature range. Due to capillary instability, the liquid phase can form either an axisymmetric rouloid morphology or, above a certain threshold liquid volume fraction, a bulge coexisting with a rouloid-like section. The corresponding melting points are different. The analysis explicitly describes the behavior of a real system of small aggregates of long chain alkanes on planar substrates. It also gives qualitative insights into the melting behavior of small aggregates with anisotropic wetting behaviors in general. It reveals in particular how melting points and melting pathways depend on the energetic respectively morphological pathways leading to complete melting.
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