硅溶胶包覆制备核壳结构VO_(2)(M)@SiO_(2)研究  

Study on preparation of core-shell structure VO_(2)(M)@SiO_(2)by silica sol-gel coating

作　　者：雷心瑜 孙恒辉 袁新强[1,2] 张伟[1] 蒋鹏[1,2] 张立斋 LEI Xinyu;SUN Henghui;YUAN Xinqiang;ZHANG Wei;JIANG Peng;ZHANG Lizhai(Department of Materials,Shaanxi University of Technology,Hanzhong 723000,China;National and Local Joint Engi-neering Laboratory for Slag Comprehensive Utilization and Environmental Technology,Shaanxi University of Technology,Hanzhong 723000,China;Department of Materials,Xi′an Jiaotong University,Xi′an 710049,China)

机构地区：[1]陕西理工大学材料科学与工程学院,陕西汉中723000 [2]陕西理工大学矿渣综合利用环保技术国家地方联合工程实验室,陕西汉中723000 [3]西安交通大学材料科学与工程学院,陕西西安710049

出　　处：《无机盐工业》2024年第6期46-54,共9页Inorganic Chemicals Industry

基　　金：陕西省技术创新引导计划项目(2021CGBX-39);陕西理工大学研究生创新基金项目(SLGYCX2303)。

摘　　要：通过SiO_(2)包覆VO_(2)(M)材料形成核壳结构,可以显著提高其可见光透过率(T_(lum)),有效减缓VO_(2)(M)的氧化过程,对于增强智能窗的应用价值具有重要意义。Stöber法是制备核壳结构VO_(2)(M)@SiO_(2)的传统方法,采用硅溶胶凝胶法来简化制备工序、降低生产成本并减少工艺调控要素。通过对硅溶胶凝胶实验的初步研究,探讨硅溶胶凝胶包覆VO_(2)(M)的工艺参数,并通过实验验证硅溶胶凝胶包覆VO_(2)(M)的可行性。研究结果表明,当pH为5~6、固含量为15%~20%(质量分数)时,硅溶胶的凝胶化能力最佳。此外,随着凝胶温度升高,凝胶时间缩短,焙烧后得到的SiO_(2)粉体结晶性和热稳定性增加。根据优化后的硅溶胶凝胶工艺参数成功制备了致密稳定的核壳结构VO_(2)(M)@SiO_(2)材料,其包覆程度达到93.3%,薄膜的光学透过率提升至65%,且其相变温度降低和热滞后回线宽度变窄。因此,硅溶胶凝胶法为制备高性能的核壳结构VO_(2)(M)@SiO_(2)材料提供了一种简化工艺和降低成本的方法,对于智能窗等应用具有重要潜力。The core-shell structured VO_(2)(M)@SiO_(2)materials can be prepared by sol-gel method aiming to significantly enhance their visible light transmittance(T_(lum))and effectively slow down the oxidation process of VO_(2)(M).It has significant implications for enhancing the application value of smart windows.While the Stöber method was a traditional approach for fabricating VO_(2)(M)@SiO_(2)core-shell structures,the sol-gel method was used to simplify the preparation process,reduce production cost,and minimize process control factors.Preliminary investigations on the silica sol-gel experiment were conducted to explore the process parameters for silica sol gelation and verify the feasibility of silica sol-gel coating on VO_(2)(M).The research results demonstrated that the optimal gelation capacity of the silica sol was achieved with a pH value of 5~6and a solid content of 15%~20%.Additionally,the gelation time was shortened with the increase of gelation temperature,and the crystallinity and thermal stability of SiO_(2)powder obtained after roasting were increased.Dense and stable core-shell structured VO_(2)(M)@SiO_(2)materials were successfully synthesized using the optimized process parameters for silica sol-gel.The coating coverage reached 93.3%,and the transmittance of the thin film was improved to 65%.Furthermore,the phase transition temperature of the material was decreased,and the hysteresis loop width was narrowed.Therefore,the sol-gel method with silica sol provided a simplified and cost-effective approach for preparing highly performance core-shell structured VO_(2)(M)@SiO_(2)materials,holding significant potential for applications such as smart windows.

关 键 词：硅溶胶凝胶法 包覆 核壳结构 VO_(2)(M)@SiO_(2)材料 

分 类 号：TQ127.2[化学工程—无机化工]