| 研究生: |
洪德才 Hung, De-Tsai |
|---|---|
| 論文名稱: |
介孔釔安定氧化鋯之合成及其特性 |
| 指導教授: |
洪敏雄
Hon, Min-Hsiung |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 材料科學及工程學系 Department of Materials Science and Engineering |
| 論文出版年: | 2005 |
| 畢業學年度: | 93 |
| 語文別: | 中文 |
| 論文頁數: | 78 |
| 中文關鍵詞: | 釔安定氧化鋯 、介孔材料 |
| 外文關鍵詞: | mesoporous material, zirconium, yttrium |
| 相關次數: | 點閱:52 下載:1 |
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自從Mobil公司在1992發表MCM-41開始,介孔材料所具有的高比表面積、孔洞大小均ㄧ以及可控制孔洞大小等特性,且介孔材料的應用廣泛,是近年來相當引人注目的研究領域之ㄧ。
本研究嘗試以溶膠-凝膠製程結合高分子液晶模板機制來合成具有介孔結構之釔安定氧化鋯。選擇非離子型界面活性劑F127作為高分子模板並以ZrCl4、YCl3做無機先驅物,利用氣相蒸發誘導自組裝的方式製備介孔釔安定氧化鋯並探討改變界面活性劑濃度、前驅物中添加水量及釔含量對合成介孔釔安定氧化鋯之影響。
結果顯示已可以合成具奈米級規則孔洞之釔安定氧化鋯粉末,經由BET分析得知介孔釔安定氧化鋯粉末之比表面積約為134 m2/g、孔洞直徑約為5 nm。結果可歸納三點結論:1、作為模版之有機高分子與形成孔壁無機前驅物須具有適當之混合比才會形成規則排列之介孔結構。2、水解和縮合反應的控制是合成介孔材料的重要影響因素;尤其是縮合反應,控制縮合反應速率有助於增加金屬離子與界面活性劑鍵結,更易形成介孔結構。3、釔的添加會抑制ZrO2的縮合反應速率,釔含量增加易合成規則排列之孔洞結構。
此外,本研究將所合成出的介孔釔安定氧化鋯粉末與陰極材料La0.7Sr0.3CoO3組成複合電極,並藉由交流阻抗分析及陰極過電壓量測對此複合電極構成的半電池進行分析。實驗結果顯示,以介孔釔安定氧化鋯粉末製成之複合電極可降低電極與電解質間之界面阻抗及電極之極化現象。
Since the mesoporous silica material,MCM-41,has been presented by Mobil company in 1922﹐there has been much interest in expanding the compositions of mesoporous inorganic materials﹒ The mesoporous materials exhibit many applications due to the high specific surface area,uniform pore size and the adjustment of pore size﹒
In this thesis﹐the mesoporous Yttria Stabilized Zirconia(YSZ) has been synthesized by integrating inorganic chemistry and liquid-crystal template mechanism﹒The F127﹐structure-directed agent , ZrCl4 and YCl3 were used to synthesize the mesoporous YSZ by the evaporation-induced self- assembly(EISA) derived method﹒The effect of experimental parameters﹐such as surfactant concentration、water contents﹐and molar ratio of Y2O3﹐on pore morphology and specific surface area are discussed in this study﹒
The mesoporous YSZ has been synthesized successfully and exhibits a high surface area﹐about 134 m2/g﹐and uniform pore size﹐about 5 nm by BET analysis﹒There are three important results obtained in this study﹒First﹐the highly ordered mesostructure can be obtained by mixing proper ratio of surfactant and inorganic precursor﹒Second﹐the most important factor of synthesized mesoporous YSZ is to control the rate of hydrolysis and condensation﹒Especially for condensation reaction﹐the slow rate can promote the metal species and hydrophilic part to form crown-ether-type complexes through weak coordination bonds﹒Thirdly﹐the addition of Y2O3 can inhibit reaction rate of condensation﹒ Therefore﹐it is helpful to form the organic- inorganic complexes with increasing of the amount of Y2O3 added﹒
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