基于溶-凝胶制备工艺的SiO2基复合相变材料研究综述

Review on Research in SiO2 Matrix Composite Phase Change Materials Based on Sol-Gel Method

相变材料可吸收或释放潜热,从而拥有储能调温潜力。溶-凝胶工艺制备的SiO2基体可为相变材料提供优良的骨架结构,改善相变材料的泄露问题。总结国内外相关文献,介绍了溶-凝胶制备工艺及SiO2基复合相变材料的形貌。阐述了SiO2基体与相变材料间的化学相容性、SiO2基体对相变材料结晶性能的影响以及SiO2基复合相变材料的热物性、热循环稳定性和储/放热性能。最后对引入碳纤维/碳纳米管和金属/金属氧化物粒子等功能型材料,以增强其导热性能及光热转化能力的两类增强型SiO2基复合相变材料进行了概述。

Phase change materials( PCMs) can absorb or release latent heats. Thus,PCMs exhibit the great potential in terms of adjusting temperature and storing energy. The SiO2 matrix prepared by sol-gel process can provide PCMs with excellent framework structure and improves the leakage of PCMs. The sol-gel preparation process and the morphologies of SiO2 matrix composite PCMs are briefly introduced based on the summary of the domestic and international references. Furthermore,the chemical compatibility between SiO2 matrix and PCMs,the effect of SiO2 matrix on the crystallization properties of PCMs,and the thermal properties,thermal cycling stability and storage/release properties of SiO2 matrix composite PCMs are described. Finally,two types of reinforced SiO2 matrix composite PCMs,which include functional materials such as carbon fiber,carbon nanotubes,metal particles,and metal oxide particles to enhance the thermal conductivity and photothermal conversion,are summarized.