高濃度塩酸水溶液中四塩化チタンの低温加水分解反応により生成する酸化チタン超微粒子のキャラクタリゼーション

本田 数博, 吉川 貴之

doi:10.2116/bunsekikagaku.56.51

書誌事項

タイトル別名

Characterization of TiO2 Ultrafine Particle Prepared by Low-Temperature Hydrolysis of TiCl4 in High-Concentration Hydrochloric Acid Aqueous Solution
アナリティカルレポート高濃度塩酸水溶液中四塩化チタンの低温加水分解反応により生成する酸化チタン超微粒子のキャラクタリゼーション
アナリティカルレポートコウノウドエンサンスイヨウエキチュウシエンカチタンノテイオンカスイブンカイハンノウニヨリセイセイスルサンカチタンチョウビリュウシノキャラクタリゼーション

この論文をさがす

説明

Ultrafine particles of TiO₂ were prepared by the hydrolysis of titanium tetrachloride (TiCl₄) in a highly concentrated hydrochloric acid aqueous solution at a low temperature, in which the surfacing modifier did not coexist. The absorption spectrum of the prepared TiO₂ ultrafine particle showed a blue shift, which was more remarkable than that of a bulk sample. The fluorescence of the prepared TiO₂ fine particles confirmed being within the ultraviolet wavelength range with a peak at 370 nm by changing the excitation wavelength from 220 nm to 300 nm. The bulk TiO₂ of Rutile and Anatase type showed light absorption in proportion to the transition of inter-bands at 413 nm (3.0 eV) and 388 nm (3.2 eV), respectively. Because the excitation wavelength of 230 nm corresponds to 5.4 eV, it is converted into the band energy. The size of TiO₂ identified from a laser scatter measurement was 3.5±1.0 nm, which was confirmed to be the size at which a quantum size effect appears. From the XRD measurement, secondary fine particles (aggregate) of TiO₂ after separation by a membrane filter was identified to be of the Rutile type. The size of the (110), (101) and (211) crystal planes were estimated to be 5.3, 8.0 and 5.1 nm by an evaluation using the Scherrer equation for the half-value width of the diffraction peak of each crystal plane. The shape of the aggregate observed from the SEM image was tabular, of μm size. It was concluded that TiO₂ fine particles with a hierarchy of sizes from nm to mm were possible by the low-temperature hydrolysis of TiCl₄ in a high concentration of hydrochloric acid aqueous solution. Application to an ultraviolet ray protective agent for UVC, UVB and UVA is expected in the future.<br>

収録刊行物

分析化学

分析化学 56 (1), 51-54, 2007

公益社団法人日本分析化学会

キーワード

詳細情報詳細情報について

書き出し

問題の指摘