硅胶和多孔玻璃对固—固相变储能材料四氯合锌酸十四烷基铵储热性能调控

发布时间：2018-07-04 19:45

本文选题：相变储能材料 + 层状类钙钛矿材料　；参考：《山东农业大学》2016年硕士论文

【摘要】：相变储能材料是通过物质相态转化来储存或释放能量的功能材料,目前被广泛的应用于军事、建筑、医药、航空航天等领域,大幅提高能源的利用率。但目前相变材料存在的相变温度适用范围小、储能密度低、过冷度大等问题限制了其适用范围,性能优良的相变材料并不能完全满足各种工作环境要求。四氯合锌酸十四烷基铵[(C_(14)H29NH3)2Zn Cl4,C_(14)Zn]是一种层状类钙钛矿型固-固相变储能材料,在外观结构上具有明显的层状结构,分子内部为有机-无机杂化层,具有稳定的晶体结构。在热力学性能方面,储热密度高,相变焓值大,过冷度相对较小,相变过程无液相、气相生成,化学性能稳定且环境友好。硅胶(SG)和多孔玻璃(CPG)是孔径大小固定,内部孔道分布均匀的常见多孔材料,在本实验中,利用硅胶和多孔玻璃特有的孔道小尺寸效应、孔道壁表面与界面效应和多孔材料内部的宏观量子隧道效应,对相变材料的热力学性能进行调控。本研究基于液相反应法制备了相变材料四氯合锌酸十四烷基铵(C_(14)H29NH3)2Zn Cl4,利用溶液浸渍法制备C_(14)Zn/SG(d=15-200nm)和C_(14)Zn/CPG(d=11.5-300 nm)复合相变储能材料。通过DSC、SEM、XRD等手段表征了上述材料的热力学性能和结构特征,探究了不同种类以及不同孔径的多孔材料对相变材料四氯合锌酸十四烷基铵储热性能的调控。本研究的主要工作如下:(1)基于液相反应法,制备四氯合锌酸十四烷基铵(C_(14)H29NH3)2Zn Cl4,并用SEM、XRD、DSC等手段表征产物的结构和热力学性能。(2)利用SEM、XRD、DSC表征硅胶SG和多孔玻璃CPG的结构和热力学性能,探究硅胶和多孔玻璃的净化。(3)基于溶液浸渍法,利用多孔材料对溶液的吸附性能,将(C_(14)H29NH3)2Zn Cl4(C_(14)Zn)吸附进不同孔径的硅胶SG和多孔玻璃CPG内,加热并真空抽滤、除尽无水乙醇,制备C_(14)Zn/SG(d=15-200nm)和C_(14)Zn/CPG(d=11.5-300 nm)复合材料。并用SEM、XRD、DSC等手段表征其结构和热力学参数,研究不同种类以及不同孔径的多孔材料对四氯合锌酸十四烷基铵储热性能的调控。
[Abstract]:Phase change energy storage material is a functional material that stores or releases energy through the phase state of material. It is widely used in military, construction, medicine, aerospace and other fields, and greatly improves the utilization of energy. However, the application of phase change materials has limited application range, low energy storage density and supercooling, which restrict its application. The phase change materials with excellent performance can not fully meet the requirements of various working conditions. Four chloro zincic acid fourteen alkyl ammonium [(C_ (14) H29NH3) 2Zn Cl4, C_ (14) Zn] is a layered perovskite solid solid phase variable storage material with distinct layered structure in appearance, and the internal molecule is organic-inorganic hybrid layer, and is stable. In terms of thermodynamic properties, the heat storage density is high, the enthalpy of phase transition is large, the supercooling is relatively small, the phase transition process is no liquid phase, the gas phase is generated, the chemical properties are stable and the environment is friendly. The silica gel (SG) and the porous glass (CPG) are the common porous materials with fixed pore size and uniform distribution of the inner pore. In this experiment, silica gel and porous glass are used in this experiment. The small size effect of glass, the surface of the pore wall and the interface effect and the macroscopic quantum tunneling effect inside the porous material regulate the thermodynamic properties of the phase change material. This study is based on the liquid phase reaction method to prepare the phase change material four chloro zincic acid fourteen alkyl ammonium (C_ (14) H29NH3) 2Zn Cl4, and the preparation of C_ (14) Zn/S by solution impregnation method. G (d=15-200nm) and C_ (14) Zn/CPG (d=11.5-300 nm) composite phase change energy storage materials were used to characterize the thermodynamic and structural characteristics of the above materials by DSC, SEM, XRD and other means. The main work of this study was to explore the regulation of the heat storage properties of different kinds and different pore sizes on the phase change material, four chloro zincic acid fourteen alkyl ammonium. (1) (1) preparation of four chloro zincic acid fourteen alkyl ammonium (C_ (14) H29NH3) 2Zn Cl4 based on liquid phase reaction method, and using SEM, XRD, DSC and other means to characterize the structure and thermodynamic properties of the products. (2) using SEM, XRD, DSC to characterize the structure and thermodynamic properties of silica gel SG and porous glass CPG, and to explore the purification of silica gel and porous glass. (3) based on solution impregnation method, profit (C_ (14) H29NH3) 2Zn Cl4 (C_ (14) Zn) was adsorbed in silica gel SG and porous glass CPG with different pore sizes by using porous materials. The structure and thermodynamic parameters of C_ (14) Zn/SG (d=15-200nm) and C_ (14) composites were prepared by heating and vacuum filtration. Number of porous materials with different pore size and different pore sizes were used to control the thermal storage properties of four ammonium chloride fourteen alkyl ammonium.
【学位授予单位】：山东农业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TB34

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