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    题名: 在低溫下以四氯化鈦製備高濃度二氧化鈦結晶覆膜液;Synthesis of Nanosized TiO2 Coating Solution from Titanium Tetrachloride
    作者: 盧明憲;Ming-Shane Lu
    贡献者: 化學工程與材料工程研究所
    关键词: 介電材料;超親水性;四氯化鈦;銳鈦礦;光催化;二氧化鈦;TiCl4;anatase;catalyst;TiO2;super-hydrophi
    日期: 2001-06-26
    上传时间: 2009-09-21 12:18:59 (UTC+8)
    出版者: 國立中央大學圖書館
    摘要: 二氧化鈦薄膜是一具有高折射率、高介電常數、在可見光及近紅外光區不吸收、化學性質穩定、硬度高耐磨等優良特性的薄膜材質,其可以廣泛應用在光催化、及其他導電性介電材料的批覆。本論文係應用無機鹽類製備出高濃度二氧化鈦微結晶粒子覆膜液,並批覆在不具親水性的基體上,使其具有高度的親水性,而達到去漬、自潔的功用。首先將系統控制在5℃,配製0.5M的TiCl4 水溶液,再將NaOH溶液,滴入TiCl4 水溶液中調整pH值範圍,經過老化、水洗過濾,再加入不同濃度或莫耳比[H+]/[Ti]的HCl,經過24~48小時的酸解解膠,可以得到穩定的TiO2懸浮液。再將所得的TiO2懸浮液以一定比例加入HPC (150-400 cps)當作粒子分散劑,我們可以得到10 %的TiO2懸浮液。 由XRD、DLS、TEM、氮吸附觀察得知,結晶粒子屬於anatase晶形,而其一次粒子為長軸20 nm,短軸5 nm的菱形粒子;且其具有高表面積141 cm3/g的微孔結構。最後測量批覆7 %TiO2薄膜的玻片基材的接觸角,證明本實驗所製備出的TiO2微結晶懸浮液僅需三次鍍膜便可完整批覆在基材表面,並使基材達到超親水性的性質。 TiO2 has been used as a coating material because of its excellent UV light-scattering effect, high refractive index, and chemical stability, even in acidic or basic environment. TiO2 in anatase phase for applications in optical or electronic devices has generally been adopted in the form of a thin film. The aim of this study was to prepare suspended titanium dioxide solution with high concentration. Titanium tetrachloride was used as a precursor. It was slowly added to the distilled water at 5 ℃. Aqueous solution of sodium hydroxide was added to adjust the pH of the system to 8-12. After aging for a period of time, the peptizate sol was filtered and sufficiently washed. The filtered cake was repulped in water. Hydrochloric acid was slowly added to the solution with stirring. After condensation reaction and crystallization, a transparent suspended TiO2 solution was formed. XRD results show that the crystalline phase was anatase. The suspended TiO2 particles were rhombus primary particles with the major axis ca. 20 nm and the minor axis ca. 5 nm. The sample prepared at pH 8 has the largest surface area of 141 cm3/g, and it was microporous. The compositions of the solution which has the smallest suspended TiO2 particles are TiO2: HCl (35 % HCl)= 1: 1 (molar ratio), concentration of TiO2 = 10 % and HPC with viscosity of 150-400 cps was added as a surfactant. The transparent thin film substrates could be obtained through dip-coating the glass in TiO2 coating solution. The dip-coating on glass can be less than three times to have one monolayer TiO2. The transparent TiO2 thin film has super-hydrophilicity after being illuminated by UV light.
    显示于类别:[化學工程與材料工程研究所] 博碩士論文

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