Fabrication of Flake‐Like Boehmite/Ceria or Zinc Oxide Composites for UV Shield Coating
Fabrication of Flake‐Like Boehmite/Ceria or Zinc Oxide Composites for UV Shield Coating
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用于紫外线屏蔽涂层的片状勃姆石/二氧化铈或氧化锌复合材料的制备
DOI：
10.1002/9781118771464.ch14
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Kenji Kido
中科院分区：
文献类型：
--
作者：
S. Obata;Susumu Kawai;Michiyuki Yoshida;O. Sakurada;Kenji Kido
探讨了湿法合成的纳米氧化铈（CeO 2）或氧化锌（ZnO）片状粒子作为紫外吸收材料的可能性。由钛酸四丁酯（TNB）与乳酸（Lac）在水中直接反应制备的钛酸四丁酯水溶液（TNB-Lac）显示出聚阴离子的特征，并用作制备CeO 2水溶液浆料的分散剂。CeO 2颗粒的等电点（IEP）随着TNB-Lac浓度的增加而向较低pH移动。通过改变CeO 2的表面性质来调节pH值和添加TNB-Lac浓度，得到了分散性良好的CeO 2浆料。另一方面，勃姆石颗粒的IEP在pH 9.5左右。根据这一结果，在pH值为6至7之间，通过带正电的勃姆石基底与带负电的CeO 2或ZnO纳米颗粒之间的静电吸引，可以合成具有0.1 mmol/g TNB-Lac的勃姆石/CeO 2或勃姆石/ZnO球。用分光光度计和扫描电镜对合成的粒子进行了表征。当勃姆石/CeO 2或勃姆石/ZnO体积比为80/20时，显微结构观察表明，在勃姆石表面包覆了CeO 2或ZnO纳米粒子。与包含纳米尺寸的CeO 2的膜的性质相比，包含5质量%的合成的复合物与20体积%的CeO 2的硅树脂膜给出了相当的UV屏蔽能力。
It was discussed that flaked shaped particle with nano sized ceria (CeO2) or zinc oxide (ZnO) synthesized by wetting process was possible to use as UV adsorption materials. Titanate aqueous solution (TNB-Lac) prepared by direct reaction of titanium tetra-n-butoxide (TNB) with lactic acid (Lac) in water shows characteristics of a polyanion and acts as a dispersant for preparing aqueous CeO2 slurries. The isoelectric point (IEP) of CeO2 particles shifted to lower pH with increasing concentration of TNB-Lac. Well-diesperesd CeO2 slurries were obtained by modification of the surface changes on CeO2 to adjust pH and addition of TNB-Lac concentration. On the other hand, the IEP of boehmite particles was at around pH 9.5. According to this result, the boehmite/CeO2 or boehmite/ZnO pomposities could be synthesized by the electrostatic attraction between positively charged boehmite substrate and negatively charged CeO2 or ZnO nanoparticles with 0.1 mmol/g TNB-Lac at around pH between 6 to 7. The synthesized particles were characterized by spectrophotometer and scanning electron microscopy. With boehmite/CeO2 or boehmite/ZnO volume ratio 80/20, the boehmite was covered with CeO2 or ZnO nanoparticles by microstructural observation. The silicon resin film including 5 mass% the synthesized composite with 20 vol% CeO2 gave the equivalent UV shield ability, compared with the property of the film including nano-sized CeO2.
影响因子：
1.1
作者：
Fengqiu Tang;T. Uchikoshi;K. Ozawa;Y. Sakka
通讯作者：
Fengqiu Tang;T. Uchikoshi;K. Ozawa;Y. Sakka