Na2 SO4/SiO2无机定形相变材料的制备及其性能研究

摘要

The Na2 SO4/SiO2 mesoporous microanocomposites and Na2 SO4/SiO2 core-shell nanoparticles were prepared by Sol-gel method taking TEOS as the silica source. The thermal properties of the resulting products were studied. Na2 SO4 in the composites acted as a latent heat storage substance for solid-liquid phase change, while SiO2 acted as support materials to provide structural strength and prevent leakage of melted Na2 SO4. The morphology and microstructure of the prepared composites were characterized by scanning electron microscope ( SEM) and X-ray powder diffraction ( XRD) . The thermal properties of composites showed excellent heat storage properties.%以正硅酸乙酯作为硅源，采用溶胶—凝胶法制备Na2 SO4/SiO2纳米介孔限域微纳米结构复合材料和Na2 SO4/SiO2核-壳结构纳米颗粒，并对其热性能进行研究。硫酸钠在复合材料中充当固-液相变的潜热储存物质，而二氧化硅作为载体材料，以提供结构强度并防止熔融的无机盐的泄漏。所制备复合材料的形貌和结构分别采用扫描电子显微镜( SEM )和X射线粉末衍射仪( XRD)进行了表征。通过对复合材料热性能的研究表明其具有优异的储热性能。