摘 要
SiO2奈微米單分散粉體的用途廣泛。在由Si(OC2H5)4 (TEOS)的水解-縮合來合成SiO2粉體時，以往的報導是於反應系統裡添加分散劑，如hexane、NP-5等之其他物質。本研究旨在合成出SiO2奈米之單分散體，實驗是以醇類矽鹽(TEOS)為起始原料，氨水為催化劑，在不使用任何的分散劑的情況下來合成SiO2粉體，並檢討pH值、水解縮合反應溫度及起始原料比例等，對合成SiO2粉體的粒徑、型態及結構之影響。實驗結果顯示，pH值、水解縮合反應溫度及反應物配比確實對合成SiO2粉體之粒徑有影響。當反應溫度升高時，所得SiO2之粒徑減小；當鹼的量增加時，SiO2粒徑隨之增加。以TEOS：EtOH：NH4OH＝5：50：1 (ml)，在室溫下反應時，可合成SiO2單分散粉體，其粒徑約為20 nm。本研究並利用固態核磁共振光譜儀偵測合成的SiO2粉體之29Si光譜，由29Si光譜及熱重分析之結果，求得SiO2奈微米單分散粉體的孔隙率。本實驗所求得的SiO2奈微米單分散粉體的孔隙率都非常的小，約小於1 %。

ABSTRACT
Monodispersed SiO2 particles have various applications. It is reported that the particles have been synthesized from the hydrolysis condensation of Si(OC2H5)4 (TEOS) by adding the dispersing agents such as hexane, NP-5, etc. in the reactive system. The aim of this research is to prepare monodispersed SiO2 particles with nanometer size from the TEOS. Ammonia is used as a catalyst, and use no any other dispersing agent. The influence of the pH value, hydrolysis and condensation reactive temperature, and starting reactants ratio on the morphology and the structure of the product SiO2 was investigated. The results show that the pH value, reactive temperature, starting reactants ratio have a significant effect on synthesized SiO2 particle size. The particle size decreased with raising the reactive temperature of hydrolysis and condensation. While increasing NH4OH concentration, the SiO2 particle size increases. Monodispersed SiO2 particles with nanometer size were obtained in the range of EtOH (99.5%) to TEOS ratio of 50 : 5, in the volume of NH4OH = 1 ml. The SiO2 particle size is about 20 nm. The porosity existed in SiO2 particle was calculated from the MAS NMR to detect 29Si spectra coordinating with TGA. The result shows the porosity existing in monodispersed SiO2 particle is very small.(<1%).

目錄
中文摘要
英文摘要
目錄
圖目錄
第一章 緒論
第二章 基礎理論
第三章 實驗步驟與方法
第四章 結果與討論
第五章 結論
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