Cao Kiet Le Anh, Taniguchi Shuto, Nguyen Tue Tri, Arif Aditya F, Iskandar Ferry, Ogi Takashi
Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan.
Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan; Department of New Investment, P.T. Rekayasa Industri Holding Company, Jl. Kalibata Timur I No. 36, Jakarta 12740, Indonesia.
J Colloid Interface Sci. 2020 Jul 1;571:378-386. doi: 10.1016/j.jcis.2020.03.064. Epub 2020 Mar 19.
Hollow silica particles are desirable for numerous applications, however, designing hollow silica materials with varying hollow structures and shapes remains a significant challenge. Herein, a strategy for the precisely controlled synthesis of hexagonal-shaped hollow silica plate (HHSP) particles was successfully prepared via a sol-gel method at room temperature, using tetraethyl orthosilicate (TEOS) as a silica precursor and zinc oxide (ZnO) particles as a colloidal template. The effect of reaction time was carried out to control the structure and morphology of HHSP particles, and the thickness of silica shell can be tuned in the range from 12.2 to 43.2 nm by adjusting the TEOS/ZnO molar ratios. In addition, the polymer/HHSP composite thin films were prepared using poly(methyl methacrylate) (PMMA) matrix and surface modified HHSP particles by grafting silane coupling agents. High transmittance values were observed (>95%) for the composite thin films (5 μm in thickness, 0.1-1.0 wt% HHSP) in the ultraviolet and visible regions. Furthermore, the refractive index of HHSP particles was observed to be 1.28, which is significantly lower than dense silica (n = 1.46). These results suggest that the approach adopted herein will open up opportunities for the development of a new generation of film materials with a low refractive index.
空心二氧化硅颗粒在众多应用中具有优势，然而，设计具有不同空心结构和形状的空心二氧化硅材料仍然是一项重大挑战。在此，通过室温溶胶 - 凝胶法，以正硅酸乙酯（TEOS）作为二氧化硅前驱体，氧化锌（ZnO）颗粒作为胶体模板，成功制备了一种精确控制合成六方形状空心二氧化硅板（HHSP）颗粒的策略。通过控制反应时间来调控HHSP颗粒的结构和形态，并且通过调整TEOS/ZnO摩尔比，二氧化硅壳层的厚度可在12.2至43.2纳米范围内调节。此外，使用聚甲基丙烯酸甲酯（PMMA）基质和通过接枝硅烷偶联剂进行表面改性的HHSP颗粒制备了聚合物/HHSP复合薄膜。对于厚度为5微米、HHSP含量为0.1 - 1.0重量%的复合薄膜，在紫外和可见光区域观察到高透过率值（>95%）。此外，观察到HHSP颗粒的折射率为1.28，明显低于致密二氧化硅（n = 1.46）。这些结果表明，本文采用的方法将为开发新一代低折射率薄膜材料带来机遇。
