Hierarchical Flower-Like Hollow SiO2@TiO2 Spheres with Enhanced Thermal Insulation and Ultraviolet Resistance Performances for Building Coating
Hierarchical Flower-Like Hollow SiO2@TiO2 Spheres with Enhanced Thermal Insulation and Ultraviolet Resistance Performances for Building Coating
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具有增强隔热和抗紫外线性能的分层花状空心SiO2@TiO2球用于建筑涂料
DOI：
10.1021/acsami.0c03125
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发表时间：
2020-05-27
影响因子：
9.5
通讯作者：
Ma, Jianzhong
中科院分区：
文献类型：
--
作者：
Bao, Yan;Guo, Ruyue;Ma, Jianzhong
本文通过溶剂热法和随后的焙烧工艺，将多种不同的功能组分完美地集成到一个单一的纳米结构中，成功地制备了具有大量不规则纳米片的新型三维分级花状二氧化硅@二氧化钛空心球(FHST)。用扫描电子显微镜、透射电子显微镜、X射线衍射仪、X射线光电子能谱、比表面积等手段对FHSTs的形貌和结构进行了表征。通过一系列的单因素实验，得到了三维花状结构的生长机理，其中六亚甲基四胺起着至关重要的作用。此外，它还用作聚丙烯酸酯基材的填料，以提高建筑涂料的隔热和抗紫外线性能。结果表明，与二氧化硅空心球、二氧化钛空心球和二氧化硅@二氧化钛空心球相比，FHSTs复合薄膜具有较低的导热系数和较高的光反射性能。更重要的是，它在紫外光全波长的透过率几乎为零，对UVA表现出显著的抑制作用。此外，与商用中空玻璃微球相比，FHSTs在实际应用中具有更优异的隔热性能。
In this paper, a novel 3D hierarchical flower-like hollow SiO2@TiO2 sphere (FHST) with a large number of irregular nanosheets was successfully prepared by a solvothermal method and subsequent calcination process, in which multiple different functional components were perfectly integrated into a single nanostructure. The morphology and structure of FHSTs were characterized by SEM, TEM, XRD, XPS, and BET. The growth mechanism of the 3D flower-like structure was obtained through a series of single-factor experiments, of which hexamethylenetetramine acted in a vital role. Moreover, it was also used as a filler for polyacrylate substrate to improve the thermal insulation and ultraviolet resistance properties of architectural coatings. The results showed that the composite film with FHSTs had lower thermal conductivity and higher light reflection performance compared to those with hollow SiO2 spheres, hollow TiO2 spheres, and hollow SiO2@TiO2 spheres. More significantly, its transmittance at the full wavelength of ultraviolet light was almost zero, exhibiting a prominent inhibitory effect on UVA. In addition, compared with commercially available hollow glass microspheres, FHSTs had more excellent thermal insulation performance in practical applications.