Study On Tuning Thermal Properties Of Solid-solid Phase Change Materials On (C₁₄H₂₉NH₃)₂ZnCl₄ By Silica Gel And Controlled Pore Glass

Phase change energy storage materials are the functional materials which can store and release energy through the material phase transformation. The phase change energy storage materials have been widely used in military, architecture, medicine, aerospace and other fields to improve energy utilization. However,the phase change materials existing problems as follow: the scope of phase change temperature is small; energy storage density is low; undercooling degree is large and so on. The number of widely-used and high qualitative phase change materials is small. C₁₄H29NH3)2Zn Cl4 is a kind of layered perovskite solid- solid phase change energy storage material, with the advantages, such as high phase change latent heat, small undercooling degree, less volatile, non-leakage, and non-toxic pollution-free. The silica gel?SG? and controlled pore glass?CPG? are porous materials with uniform pore size distribution. Using the porous materials' characteristics, such as the small size effect, surface effect and macroscopic quantum tunneling effect with the interface, to regulate of the thermodynamic properties of solids in the hole. On this study, based on liquid phase reaction method and solution impregnation method, we have prepared(C₁₄H29NH3)2Zn Cl4, C₁₄Zn/SG?d = 15-200 nm? and C₁₄Zn/CPG?d = 11.5-300 nm?, and characterize the structure and thermodynamic properties of these materials by DSC, SEM, XRD and explore the heat storage property tuning of different kinds and aperture of porous materials on the(C₁₄H29NH3)2Zn Cl4. The main work of this study is as follow:?1? Based on liquid phase reaction method, we have prepared(C₁₄H29NH3)2Zn Cl4, and characterize the structure and thermodynamic properties of it by DSC, SEM, XRD.?2? Characterize the structure and thermodynamic properties of the SG and CPG by DSC, SEM, XRD, explore the purification and recycling of the silica gel and porous glass?3? Based on solution impregnation method and porous materials' adsorption of solution, we have prepared C₁₄Zn/SG?d = 15-200 nm? and C₁₄Zn/CPG?d = 11.5-300 nm? materials by(C₁₄H29NH3)2Zn Cl4 adsorbed into SG and CPG and slowly evaporating anhydrous ethanol. We characterize the structure and thermodynamic properties of C₁₄Zn/SG?d = 15-200 nm? and C₁₄Zn/CPG?d = 11.5-300 nm? materials by SEM, XRD, DSC and study the phase change temperature and phase change enthalpy tuning of different kinds and aperture of porous materials on(C₁₄H29NH3)2Zn Cl4.