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姓名 周德瑜( Der-Yu Chou)  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 四氯化鈦之控制水解研究
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摘要(中) 本研究主要目的有二:首先,以四氯化鈦為原料製備出粒子粒徑介於20?50nm、具有結晶性之氧化鈦穩定懸浮溶液。其次,將上述氧化鈦粒子添加有機界面劑,避免粒子聚集。
我們以共沈澱法於酸性的環境下(pH=1.5)合成氫氧化鈦溶膠。經去離子水洗除溶膠中大部分的離子後,再以適當的酸量解膠。所產生氫氧化鈦可以較少量的酸達到解膠的目的。我們還比較了不同老化時間、解膠溫度、解膠時溶液酸鹼值對最後氫氧化鈦粒子大小之影響。於酸性環境下滴定合成的氫氧化鈦,只需添加酸鈦比為0.2左右的酸量,使溶液酸鹼值約介於1.2?1.5之間即可。於60℃加熱4小時內解膠即可製備出平均粒徑25nm的銳鈦礦(anatase)相氧化鈦結晶粒子。此時溶液本身成分為TiO2/HCl/H2O=1/0.196/44.27,氧化鈦固含量佔9.05wt﹪。
另外,於合成出之氧化鈦結晶懸浮液中添加有機酸等界面劑,能有效將表面改質而產生穩定之作用。氧化鈦粒子之界面電位隨著界面劑所帶有之羧基(-COOH)增加而增大。有機酸若只含一個羥基對氧化鈦粒子界面電位的影響並不大,但已足以造成立體屏障效應維持粒子的穩定懸浮。而雙酸或三酸對界面電位影響較大,但氧化鈦粒子卻有聚集現象發生。
關鍵字(中) ★ 氧化鈦
★ 四氯化鈦
關鍵字(英)
論文目次 目錄
摘要-------------------------------------------------------------------------------------------Ⅰ
目錄-------------------------------------------------------------------------------------------Ⅱ
圖目錄----------------------------------------------------------------------------------------Ⅳ
表目錄----------------------------------------------------------------------------------------Ⅵ
第一章 研究背景-------------------------------------------------------------------------1
1-1 奈米級氧化鈦結晶粒子應用及其製法-------------------------------------------1
1-1.1 簡介-----------------------------------------------------------------------------1
1-1.2二氧化鈦的應用---------------------------------------------------------------2
1-1.3二氧化鈦結晶奈米粒子製作------------------------------------------------2
1-2 製備氧化鈦結晶粒子之回顧-------------------------------------------------------5
1-3 氧化鈦表面改質----------------------------------------------------------------------10
1-4 研究目標-------------------------------------------------------------------------------14
第二章 奈米級氧化鈦結晶懸浮液製備-----------------------------------------------17
2-1 四氯化鈦於水溶液中的水解縮合行為-------------------------------------------17
2-1.1分電荷理論---------------------------------------------------------------------18
2-1.2水解反應------------------------------------------------------------------------19
2-1.3縮合反應------------------------------------------------------------------------21
2-2 四氯化鈦水溶液之配製-------------------------------------------------------------23
2-3 氫氧化鈦之製備----------------------------------------------------------------------23
2-3.1實驗方法------------------------------------------------------------------------24
2-3.2氫氧化鈦製備之方法與解膠結果------------------------------------------24
2-3.3結果討論------------------------------------------------------------------------26
2-4 老化時間對解膠的影響-------------------------------------------------------------27
2-4.1 實驗方法-----------------------------------------------------------------------27
2-4.2 不同老化時間對氫氧化鈦結晶及解膠影響-----------------------------28
2-4.3 結果討論-----------------------------------------------------------------------29
2-5 溫度及溶液酸鹼值對解膠的影響-------------------------------------------------30
2-5.1 實驗方法-----------------------------------------------------------------------31
2-5.2實驗結果------------------------------------------------------------------------34
2-5.3結果討論------------------------------------------------------------------------34
2-6 奈米級氧化鈦粒子結晶態的確定及粒子分佈狀態-----------------------------35
2-6.1 儀器測量------------------------------------------------------------------------39
2-6.2 實驗結果------------------------------------------------------------------------40
2-6.3 結果討論------------------------------------------------------------------------43
2-7 結論--------------------------------------------------------------------------------------43
第三章 氧化鈦粒子表面改質(Surface Modification)--------------------------------46
4-1 實驗方法--------------------------------------------------------------------------------47
4-2 實驗結果--------------------------------------------------------------------------------47
4-3 結果討論--------------------------------------------------------------------------------52
第四章 結論---------------------------------------------------------------------------------53
參考文獻-------------------------------------------------------------------------------------56
附錄一:實驗所使用藥品----------------------------------------------------------------62
附錄二:實驗所使用相關儀器----------------------------------------------------------63
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指導教授 蔣孝澈(A.S.T. Chiang) 審核日期 2001-7-14
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