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博碩士論文 etd-0716102-193900 詳細資訊
Title page for etd-0716102-193900
論文名稱
Title
矽化六方對稱CnTAB液晶之 形成機制與混摻行為研究
none
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
89
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2002-07-02
繳交日期
Date of Submission
2002-07-16
關鍵字
Keywords
六方、偏光顯微鏡、MCM-41、界面活性劑、層狀、電子顯微鏡、立方
lamellar, optial microscope, cubic, Analytical electron microscopy, surfactant, MCM-41, hexagonal
統計
Statistics
本論文已被瀏覽 5681 次,被下載 3270
The thesis/dissertation has been browsed 5681 times, has been downloaded 3270 times.
中文摘要
摘要:
常溫(30℃左右)下,以特定的界面活性劑(四級銨鹽CTAB,尾鏈長度分別為n=18,16,12),加入矽前驅物,並用”後加酸法”所得鹼性水溶液,經過水熱反應48小時之後,以乙醇洗去界面活性劑,以X光繞射、偏光顯微鏡、TEM觀察所得六方對稱中尺度孔洞分子篩MCM-41之微觀形態、結構組織。結果發現在PH=10或8.25情況下,n=16者形成之矽化六方對稱液晶最完善,甚至具有管中管結構,n=12、18則形成較多層狀液晶。無論如何矽化六方液晶可由層狀矽化液晶變化而來,由奈米矽化六方對稱液晶顆粒之成核及依{10}晶面及底座面接合成長而來,或是由矽化單一桿狀微胞組合而來。此外以n=12與18的 常溫混合溶液,經水熱矽化反應,形成兩種個別矽化微胞(C12TAB、C18TAB)及分子混摻矽化微胞(C12-18TAB),所組成的三種較不完美之矽化六方液晶。而已經熱水處理形成之兩種矽化六方液晶,若於常溫混摻,並後續熱水處理,則因亂度之需求,及溫度與濃度之變化而發生逆反應,使得兩種矽化六方液晶退化成微胞,進一步釋出分子,並隨時間重新組成一妥協的矽化分子混摻微胞所組成的非完美矽化六方液晶。而層狀矽化液晶之混摻較不易評估逆反應之情況。以偏光顯微鏡觀察常溫及水熱後之水溶液中之矽化 物質,則發現層狀物質或顆粒於常溫已達微米級,且可捲曲。

Abstract
none
目次 Table of Contents
摘要 i
圖表目錄 I
Ⅰ.前言 1
Ⅰ.1.界面活性劑簡介 1
Ⅰ.2.界面活性劑分子的叢集 1
Ⅰ.2.a.疏水效應 1
Ⅰ.2.b.靜電效應 1
Ⅰ.2.c.微胞與單體之熱力學平衡 1
Ⅰ.2.d.微胞的幾何形狀 2
Ⅰ.3.中孔性沸石的簡介 4
Ⅰ.3.a.孔洞的分類 4
Ⅰ.3.b.沸石的發展與應用 4
Ⅰ.3.c.合成沸石的晶格分類 4
Ⅰ.4.MCM-41的生成機制與微胞之間的平衡 5
Ⅰ.5.研究動機 8
Ⅱ.實驗步驟 9
Ⅱ1.備製溶液 9
Ⅱ.2.藥品與儀器 11
Ⅲ.實驗結果 12
Ⅲ.1.X光繞射圖 12
Ⅲ.1.1.個別CnTAB效應 12
Ⅲ.1.2.CnTAB液晶混摻效應 12
Ⅲ.2.穿透式電子顯微鏡觀察 15
Ⅲ.2.1.個別CnTAB合成之矽化液晶 15
Ⅲ.2.2.混摻CnTAB合成之矽化液晶 15
Ⅲ.3.偏光顯微鏡的觀察 18
Ⅲ.3.1.未經水熱反應的矽化C16TAB液晶 18
Ⅲ.3.2.經水熱反應的矽化C16TAB液晶 18
Ⅳ.討論 19
Ⅳ.1.矽化六方液晶形成機制 19
Ⅳ.2.微胞或分子混摻水熱反應之熱力學因素 19
Ⅳ.3.不同CnTAB之矽化六方液晶及層狀液晶混摻機制 19
Ⅴ.結論 22
Ⅵ.參考文獻 23

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