多孔性奈米級二氧化鈦及鈦酸鋇粉體之製備及特性研究

Synthesis and characterization of mesoporous Nanopowder Titanium Oxide and Barium Titanate

廖彩惠(Tsai-Hui Liao)

指導教授 ： 王宏文

中原大學/理學院/化學研究所/碩士(2004年)

https://doi.org/10.6840/cycu200400098

摘要

鈦酸鋇是一種高介電常數的卑金屬陶瓷粉體，擁有相當高的容積效率、高的逸散因子以及適用於低的工作電壓，主要為積層及陶瓷電容器之關鍵原材料。然而近幾年來奈米核殼結構及奈米中空球體的研究引起科學界廣泛的興趣及討論，因為核殼結構粒子具許多特殊電、磁、光學及觸媒性質，所以我們將對核殼結構奈米粒子的製程及性質做探討。本研究主題為多孔性奈米級二氧化鈦及鈦酸鋇粉體之製備，主要分成四大部分，第一部分為奈米級多孔性二氧化鈦粉體之製備，實驗部分是將界面活性劑(直鏈十四胺)加入80ml、160ml的乙醇及100ml去離子水中形成微胞(micelle)，在外圍親水端的部分與鈦的烷氧化物產生鍵結，分別控制25℃及50℃，靜置7天，400℃熱處理3小時，分別觀察溫度及溶劑量上的改變對二氧化鈦的型態及外觀上的影響；第二部分為多孔性鈦酸鋇粉體之製備，控制界面活性劑及鈦烷氧化物的比例，將其加入不同水量中所形成的微胞，亦於親水端的部分與鈦的烷氧化物產生鍵結，最後分別加入氫氧化鋇(Ba(OH)2) 及醋酸鋇 (Ba(CH3COO)2)，7天水解縮合反應完成後，經過450℃ 3小時及750℃ 2小時的熱處理，合成中空的奈米級鈦酸鋇粉體。第三部分為利用醋酸來延遲鈦烷氧化物水解縮合作用以達到提升孔洞數量及多孔性鈦酸鋇粉體表面積。第四部分則是對奈米級多孔性鈦酸鋇粉體的燒結狀態做簡單的討論

關鍵字

多孔性奈米粉體 ； 鈦酸鋇 ； 二氧化鈦

並列摘要

Barium Titanate with high dielectric constant is a kind of ceramic powder, which is with volumetric efficiency, dissipation factor,and sutiable on low workinag voltage, and it is the mean material of Multi-Laminated Ceramic Capacity. However, several researchers have focused on nano-sized core-shell structure and mesoporeous particles in physical and life sciences, because of special electro-magnetic properties, optical characteristics and catalytic properties of core-shell structure particles. We will further study the properties of the core-shell structure. There are three parts in this study, synthesis and sintering of mesoporous Barium titanate nano-powders. In the first part, the surfactant were added to 80ml, 160ml ethanol and 100ml water and aging temperature were 25℃ and 50℃ for seven days. The powders were calcined 400℃ for three hours. Investigating the different of morphology of Titanium oxide influenced by temperature or volume of solvent. In the second part, micelle was synthesized in different volume of water with surfactant. Barium hydroxide and Barium acetate were added in the solution. And hydration and condensation were finished for seven days. Calcined 450℃ for three hours and 750℃ for two hours. In the third part, it is for rising the volume of pores and the BET surface area of mesoporous Barium titanate to add Acetate to being hydrolysis retarding agent. In the last part, Sintering of mesoporous Barium titanate nano-powders were investigated and identified with electron microscope.

並列關鍵字

mesoporous nanopowder ； Barium titanate ； titanium oxide

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