【摘要】 分别采用差示扫描量热仪和冷热台对纯辛烷以及辛烷微胶囊进行熔化实验,显微镜用来观测加热/冷却过程中相变物质的相行为。结果表明自由界面的存在能有效降低熔化势垒,而快速加热具有相反的作用,即导致一定程度的过热,遵循经典相变理论。界面的存在和受限空间对相变的特性会有一定程度的影响。提供了辛烷的冷凝过程,用来和熔化过程进行比较,结果发现二者的相变点并不完全一致。更多还原

【Abstract】 The melting processes of pure octane and micro encapsulated octane were studied by differential scanningcalorimeter and heating/cooling stage separately,and microscope was used to observe the whole process continuously.The results showed that the free surface can reduce the melting barrier effectively and fast heating will induceoverheating, obeying to the classic melting theory. Solidification process was also provided to make a comparison tostudy the kinetic and thermodynamics properties of phase change.更多还原