首页|硅溶胶包覆制备核壳结构VO2(M)@SiO2研究

硅溶胶包覆制备核壳结构VO2(M)@SiO2研究

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通过SiO2包覆VO2(M)材料形成核壳结构,可以显著提高其可见光透过率(Tlum),有效减缓VO2(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VO2(M)@SiO2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VO2(M)的工艺参数,并通过实验验证硅溶胶凝胶包覆VO2(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SiO2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VO2(M)@SiO2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VO2(M)@SiO2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.
Study on preparation of core-shell structure VO2(M)@SiO2 by silica sol-gel coating
The core-shell structured VO2(M)@SiO2 materials can be prepared by sol-gel method aiming to significantly en-hance their visible light transmittance(Tium)and effectively slow down the oxidation process of VO2(M).It has significant implications for enhancing the application value of smart windows.While the Stober method was a traditional approach for fabricating VO2(M)@SiO2 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 con-ducted to explore the process parameters for silica sol gelation and verify the feasibility of silica sol-gel coating on VO2(M).The research results demonstrated that the optimal gelation capacity of the silica sol was achieved with a pH value of 5~6 and 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 SiO2 powder obtained after roasting were increased.Dense and stable core-shell structured VO2(M)@SiO2 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 struc-tured VO2(M)@SiO2 materials,holding significant potential for applications such as smart windows.

sol-gel method using silica solcoatingcore-shell structureVO2(M)@SiO2 materials

雷心瑜、孙恒辉、袁新强、张伟、蒋鹏、张立斋

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陕西理工大学材料科学与工程学院,陕西汉中 723000

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

西安交通大学材料科学与工程学院,陕西西安 710049

硅溶胶凝胶法 包覆 核壳结构 VO2(M)@SiO2材料

陕西省技术创新引导计划陕西理工大学研究生创新基金

2021CGBX-39SLGYCX2303

2024

无机盐工业
中海油天津化工研究设计院 中国化工学会无机酸碱盐专业委员会

无机盐工业

CSTPCD北大核心
影响因子:0.489
ISSN:1006-4990
年,卷(期):2024.56(6)
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