Systematic investigation on preparation and characterization of silica shell microencapsulated phase change materials based on sodium silicate precursor

被引：21

作者：

Zhang, Daofu ^{[1
]}

Liu, Chang ^{[1
]}

Yang, Yunmiao ^{[2
]}

Tang, Xiaohong ^{[2
]}

Jiang, Zhuoni ^{[1
]}

Su, Li ^{[1
]}

Li, Xiaoan ^{[3
]}

Chen, Zhengguo ^{[3
]}

Yang, Wenbin ^{[1
,3
]}

机构：

[1] Southwest Univ Sci & Technol, Sch Mat & Chem, State Key Lab Environm Friendly Energy Mat, Mianyang 621010, Sichuan, Peoples R China

[2] Southwest Univ Sci & Technol, Sch Econ & Management, Mianyang 621010, Sichuan, Peoples R China

[3] Mianyang Cent Hosp, NHC Key Lab Nucl Technol Med Transformat, Mianyang 621019, Sichuan, Peoples R China

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2023年 / 667卷

关键词：

Sodium silicate; Microencapsulated phase change materials; High encapsulation rate; SOL-GEL SYNTHESIS; SIO2; SHELL; FABRICATION; PARAFFIN; CORE;

D O I：

10.1016/j.colsurfa.2023.131328

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A kind of paraffin@silica (Pn@SiO2) microencapsulated phase change materials (MEPCM) were prepared by sol-gel method using sodium silicate as silica precursor. The investigation of this synthesis technique demonstrates that pH value and core/shell ratio play key role in optimizing the morphology and microstructure of Pn@SiO2 microcapsules to achieve optimal thermal storage properties. Therefore, we systematically investigated the effects of pH value and core/shell ratio on the microstructure, crystallization behavior and phase transition properties of Pn@SiO2. It was determined that at pH 3 and Pn/SiO2 ratio of 5:1, the synthesized Pn@SiO2 exhibited well-defined core-shell structure and regularly spherical morphology. The encapsulation rate reached 74.14 % with latent heat of about 186.4 J/g due to the formation of perfect microstructure and morphology. In addition, Pn@SiO2 presents excellent heat storage capacity, high thermal stability and good shape stability, and shows reliable and durable phase-change performance. In summary, sodium silicate was used as the SiO2 precursor for the first synthesis of MEPCM with high encapsulation rate and regularly spherical morphology.

引用

页数：10

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