In order to promote the development of phase change materials (PCMs) and make them better applied, more in-depth research on the PCMs encapsulation is needed. The hollow ceramsite prepared in this study is a new type of PCMs carrier. Due to its unique structure, the encapsulation of PCMs by hollow ceramsite differs from that of ordinary porous ceramsite. In this paper, the adsorption and sealing effect of hollow ceramsite on PCMs was studied, the key factors affecting the adsorption and sealing effect were determined, and the encapsulation mechanism was revealed. The results show that the driving force of PCMs into the cavity of hollow ceramsite is mainly from the external pressure; the pore size and PCMs properties are the key factors determining the adsorption effect of hollow ceramsite. The pressure on the pore is proportional to the square of the pore diameter; increasing pore size enhances the possibility of the PCMs entering the cavity of ceramsite. The contact angle between PCMs and pores is smaller, and the surface tension of the PCMs in the pores is greater, making it difficult for PCMs to enter the cavity of ceramsite. The sealing mechanism of the coating on infiltrating PCMs is achieved by reducing the pore diameter of the sealing coating and increasing the resistance of PCMs to break through the pore. The sealing mechanism of the coating on non-infiltrating PCMs is achieved by changing the contact property between the PCMs and pore, increasing the energy barrier. After coating, the mass loss rate of infiltrating paraffin was controlled within 5 %, and the leakage rate of non-infiltrating hydrated salt was controlled within 1 %.

中文翻译：

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空心陶粒对相变材料（PCM）的封装效果及机理研究


为了促进相变材料（PCM）的发展并使其得到更好的应用，需要对相变材料的封装进行更深入的研究。本研究制备的空心陶粒是一种新型相变材料载体。由于其独特的结构，空心陶粒对相变材料的封装不同于普通多孔陶粒。本文研究了空心陶粒对相变材料的吸附密封效果，确定了影响吸附密封效果的关键因素，揭示了其封装机理。结果表明，相变材料进入空心陶粒空腔的驱动力主要来自于外部压力；孔径大小和相变材料性能是决定空心陶粒吸附效果的关键因素。孔隙上的压力与孔隙直径的平方成正比；孔径的增加增加了相变材料进入陶粒空腔的可能性。相变材料与孔隙的接触角较小，孔隙内相变材料的表面张力较大，使得相变材料难以进入陶粒空腔。涂层对渗透相变材料的密封机制是通过减小密封涂层的孔径并增加相变材料突破孔隙的阻力来实现的。非渗透相变材料上涂层的密封机制是通过改变相变材料与孔隙之间的接触特性，增加能垒来实现的。涂覆后，渗透石蜡质量损失率控制在5%以内，非渗透水合盐泄漏率控制在1%以内。