热重分析
材料科学
差示扫描量热法
热稳定性
明胶
衍射仪
相变材料
液体石蜡
化学工程
复合材料
热能储存
扫描电子显微镜
热的
化学
有机化学
气象学
工程类
物理
热力学
生物
生态学
作者
Yuti Tian,Yong Liu,Li Zhang,Quanxian Hua,Li Liu,Baoming Wang,Jianwei Tang
标识
DOI:10.1016/j.colsurfa.2019.124216
摘要
Paraffin is widely used in solar energy and building energy saving because of its high latent heat and low cost. However, it is easy to leak during the phase transition process, which has adverse effects on the thermal properties and thermal stability of paraffin. In this study, the composites of gelatin and sodium alginate were used as wall material, and the paraffin microcapsules were prepared by complex coacervation. The research studied the effects of the ratio of wall material, the core-wall ratio, the emulsification time, the volume of CaCl2 solution and the pH value on the thermal properties and thermal stability of microcapsules. And the characteristics of microcapsules were analyzed by Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometer (XRD), laser particle size analyzer, scanning electron microscope (SEM), energy dispersive spectrometer (EDS), thermogravimetric analysis (TGA) and differential scanning calorimeter (DSC), respectively. The results showed that the encapsulation ratio of microcapsules achieved 82.12 % when the ratio of wall material was 3:0.75, the core-wall ratio was 1.5:1, the emulsification time was 60 min, the volume of CaCl2 solution was 50 mL, and pH value was 4.5. Microencapsulation of paraffin improves the thermal stability and durability of paraffin. Microcapsules are spherical and the particle size distribution is affected by reaction conditions. The prepared microcapsules with suitable thermal properties and thermal stability, non-toxic and environmentally friendly can be applied to thermal energy storage system to improve energy utilization.
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