二氧化矽/二氧化鈦核殼顆粒的製備與探討

Preparation and Properties of SiO2 / TiO2 core-shell particles

郭怡茵(Yi-Yin Kao)

指導教授 ： 許克瀛

中原大學/工學院/化學工程研究所/碩士(2009年)

https://doi.org/10.6840/cycu200901091

摘要

利用Stöbe method製備二氧化矽微球，再以溶膠-凝膠法將二氧化鈦包覆在二氧化矽上。添加螯合劑乙醯丙酮(Acetylacetone , AcAc )與二氧化鈦的前趨物鈦烷氧化物進行螯合反應和加入聚二乙醇(Polyethylene glycol, PEG)來達到降低鈦烷氧化物水解的速率，避免二氧化鈦快速沉澱的現象發生，以製備出包覆均勻的二氧化矽/二氧化鈦核殼結構的顆粒。再添加離子型介面活性劑硫酸鈉十二烷酯(Sodium dodecyl sulfate, SDS)和非離子型分散劑聚乙烯基烷(Polyvinylpyrrolidone, PVP)達到顆粒分散的效果，接著利用高溫鍛燒改質，改善核殼顆粒的晶相。

使用的分析儀器包括Zata sizer、SEM、XRD、FTIR、TGA及UV/vis等儀器，以Zata sizer來分析二氧化矽奈米球在溫度參數的影響下其粒徑的分佈，在SEM上，可觀察到核殼顆粒的結構，從XRD中，探討二氧化矽和有機基團對二氧化鈦晶相的影響，由FTIR可鑑定核殼顆粒的化學結構，利用TGA來做核殼顆粒的熱性質分析，最後以UV/vis探討合成顆粒的吸收波長範圍與吸收度。

關鍵字

核殼結構 ； 溶膠-凝膠 ； 螯合劑 ； 二氧化鈦

並列摘要

The silica nanospheres were prepared by Stöbe method, and coating with with the titania on the silica particles via sol-gel route. To prepare the homogenous silica/titania core-shell particles, the acetylacetone served as chelating agent to chelate with the titanium alkoxide which used as the titania precursor, and added the polyethylene glycol additionally to stabilize the hydrolysis-condensation process and to avoid fast precipitation. In addition, the ionic surfactant sodium dodecyl sulfate and the nonionic surfactant polyvinylpyrrolidone dispersed the core-shell particles. In order to improve crystalline, high temperature to calcine core-shell particles was used.

There are many instruments of analysis to be used, including Zata sizer, SEM, X-ray powder diffraction, FTIR and TGA. From the Zata sizer results, the particle size distribution of silica nanospheres with the temperature parameter was analyzed. From the SEM results, the core-shell materials and its structure were observed. From the XRD result, the change of titania lattice constants from the influence of slica and the organic group was confirmed. From the FTIR result, the chemical structure of core-shell particles was identified. From the TGA result, the thermal property of core-shell particles was obtained. And from the UV/vis result, the wavelength and absorbance of core-shell particles was identified

並列關鍵字

titania ； chelating agent ； core-shell structure ； sol-gel

參考文獻

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