期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 625, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2021.126905
关键词
Paraffin wax; Sodium silicate; Microencapsulated phase change material; High encapsulate efficiency; Thermal regulation capacity
资金
- National Natural Science Foundation of China [21376153]
- Fundamental Research Funds for the Central University of China
A new encapsulated phase change material with excellent thermal management performance was successfully prepared in this study. Due to the low cost of raw materials, it has the potential for practical applications in various fields.
Advanced thermal management system based on paraffin wax (PW) is an effective method to alleviate the increasing energy consumption. In this work, a new encapsulated phase change material (EPCM) was prepared by in-situ dehydration and condensation reaction, which consists of silica shell derived from sodium silicate and PW core. The chemical structure, crystal structure and microstructure of EPCMs were characterized by FT-IR, XRD, OM, TEM and SEM, which proved that the PW was successfully encapsulated by silica shell. In addition, the DSC, TGA, and leakage testing demonstrated that EPCMs possessed depressed supercooling, good thermal stability and leak-proof performance. When the mass ratio of PW/ SiO2 is 4:1, the encapsulation ratio and encapsulation efficiency can reach 74.51% and 75.58%, respectively, and the corresponding latent heat is 94.4 J/g (melting process) and -93.2 J/g (solidifying process). In addition, the heat storage/release rate, thermal regulation ability and thermal cycling ability indicated that the EPCM has good thermal management performance. Due to the low cost and availability of sodium silicate and PW, the encapsulation technology proposed in this work has great potential practical application feasibility in the field of thermal management, including packaging, clothing and architecture.
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