博碩士論文 89321034 詳細資訊




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姓名 楊脩生(Hsiu-Sheng Yang)  查詢紙本館藏   畢業系所 化學工程與材料工程學系
論文名稱 具再分散性之奈米級氧化鋯結晶粒子之合成研究
(Preparation of Agglomeration-free Zirconia Nanocrystals)
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摘要(中) 中文摘要
本研究的目的是在低溫下製備出具有均一粒徑且可分散在溶劑中的氧化鋯奈米結晶。過程中先探討影響氫氧化鋯水解程度的因素,然後找到適當條件製備出氧化鋯奈米結晶。最後將之表面改質使可分散於中性溶劑。
本研究以氯氧鋯為原料,先配製含鋯之酸液。再以氨水或者氫氧化鈉將之中和以水解沉降製成氫氧化鋯。最後再以水熱反應將氫氧化鋯製成氧化鋯結晶。其中探討離子濃度、pH值、水熱溫度等變因對產生氧化鋯之粒徑及結晶性的影響。我們發現在鹼性下合成出的氫氧化鋯可以製成較均勻之半透明氧化鋯粒子溶膠。此一溶膠經過凝絮過濾清洗等步驟得到非晶形之氧化鋯凝膠。再將凝膠分散於氫氧化鈉溶液中,於110℃下水熱15小時後,可得到30nm左右之t-ZrO2。經由表面改質後製出可再分散於中性溶液之奈米結晶。
摘要(英) Abstract
This work describes the low-temperature synthesis of zirconia nanocrystals. The synthesized nanocrystals are aggregate-free and can be redispersed in neutral solutions.The zirconia nanocrsytals are synthesized from zirconium oxychloride via intermediate formation of zirconium hydroxide, precipitated by the addition of NaOH or NH4OH. The transformation of zirconium hydroxide into the nanocrystals of zirconia was effected by a hydrothermal treatment.The hydrolysis of zirconium oxychloride was found to be dependent on pH and was highest at pH 10, amongst the pH range studied. The hydrolyzed product of zirconium oxychloride was maintained at pH 11.5 and was hydrothermally treated at 1100C, for 15 h, which then produced nanocrystals.The nanocrystals obtained were 10 nm in size(TEM and XRD analysis). Te nanocrystals could be redispersed in water upon their surface modification; this suspension gave particle size of 30 nm on DLS analysis. The nanocrystals showed tetragonal geometry (XRD and EDS) and the crystallinity (DSC) was near to 100%.
關鍵字(中) ★ 表面改質
★ 再分散
★ 氧化鋯
★ 奈米粒子
關鍵字(英) ★ Agglomeration-free
★ zirconia
★ nanoparticle
★ Surface modification
論文目次 目錄
摘要……………………………………………………………………Ⅰ
目錄……………………………………………………………………Ⅱ
圖目錄…………………………………………………………………Ⅳ
表目錄…………………………………………………………………Ⅶ
第一章 緒論……………………………………………………………1
1.1-1 氧化鋯的基本性質……………………………………………….1
1.1-2 氧化鋯之應用…………………………………………………….2
1.2-1 奈米陶瓷材料…………………………………………………….3
1.2-2 奈米粒子之合成方法…………………………………………...6
1.3 合成氧化鋯奈米粒子之文獻回顧……………………..………….6
1.3-1 水熱合成氧化鋯結晶粒子之文獻回顧………………………….8
1.3-2 奈米粒子的團聚與分散…………………..……………………14
1.4 研究方向………..………………………………..………………18
第二章 製備氫氧化鋯溶膠………………………………………….22
2.1 製作氫氧化鋯溶膠過程變因探討……………………………….22
2.2 製作高度水解之氫氧化鋯溶膠…………………………………..36
第三章 奈米氧化鋯結晶水熱合成及表面改質…………………….42
3.1 結晶度之判斷…………………………………………………….42
3.2 氧化鋯之水熱結晶………………………………………………..43
3.3 氧化鋯之表面改質………………………………………………..51
第四章 結論…………………………………………………………..72
參考文獻………………………………………………………………..73
附錄一:實驗所使用相關儀器………………………………………..77
附錄二:實驗藥品……………………………………………………..79
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指導教授 蔣孝澈(Shiaw-Tseh Chiang) 審核日期 2002-7-8
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