石蜡@碳酸钙相变微胶囊的自组装制备及其热物性

采用自组装法成功设计制备了石蜡 @CaCO₃ 相变微胶囊, 并研究了不同芯壁比对相变微胶囊性能的影响。 通过扫描电子显微镜发现所得的微胶囊呈明显的球状, 由 X 射线衍射曲线可以看出, 颗粒壳体的结晶型为方解石型 和球霰石型的一种混合性结晶型。其相变研究结果表明当芯壁比为 1 : 1 时, 微胶囊的包封率和相变潜热达到最大, 分别为 73.7% 和 102.8 J/g。此时制备得到的微胶囊的热导率相对于石蜡芯材可提高 414.8%。制备胶囊过程中, 不同 的芯壁比会影响微胶囊的结构形貌、包封率以及热学性能。综合测试结果表明: 当微胶囊的芯壁比为 1 : 1 时, 所得 微胶囊的性能最佳。

Preparation and Thermophysical Property Analysis of Paraffin@CaCO3 Phase Change Microcapsules by Self-Assembly

Paraffin@CaCO₃ phase change microcapsules were successfully designed and prepared by the self-assembly method. The effects of varied core-to-wall ratios on phase change microcapsules performance were examined. Scanning electron microscopy reveals that the microcapsules are spherical in form, the X-ray diffraction curves show that the crystalline type of the particle shell is a mixed phase of calcite and sphalerite. The results of the phase transition study show that the encapsulation rate and the latent heat of phase transition of the microcapsules reach the maximum 73.7% and 102.8 J/g, respectively, at a core-to-wall ratio of 1 : 1. The thermal conductivity of the prepared microcapsules is increased by 414.8% compared to the paraffin core. During the preparation of the capsules, different core-to-wall ratios affect the structural morphology, the encapsulation rate and the thermal properties of the microcapsules. The comprehensive test results show that the best performance of the microcapsules is obtained when the core-to-wall ratio is 1 : 1.