利用非掌性香蕉形液晶分子自組裝形成具有旋性三級微奈米結構之研究

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研究生：	林士傑 Shih-Chieh Lin
論文名稱：	利用非掌性香蕉形液晶分子自組裝形成具有旋性三級微奈米結構之研究 Hierarchical Superstructures with Helical Sense in the Self-assembly of Achiral Banana-shaped Liquid Crystalline Molecules
指導教授：	何榮銘 Rong-Ming Ho 許千樹 Chain-Shu Hsu
口試委員:
學位類別：	碩士 Master
系所名稱：	工學院 - 化學工程學系 Department of Chemical Engineering
論文出版年：	2007
畢業學年度：	95
語文別：	英文
論文頁數：	109
中文關鍵詞：	掌性、自組裝、香蕉形液晶、螺旋結構、分子規則性
外文關鍵詞：	chirality, self-assembly, banana-shaped liquid crystals, helical structure, molecular regularity
相關次數：	點閱：1 下載：0
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利用非掌性香蕉形液晶分子自組裝形成具有旋性三級結構,說明了三級掌性效應的存在是藉由非掌性香蕉形液晶分子的自組裝造成,而分子規則性會誘導二級分子構形的掌性效應(即彎曲形的化學結構會誘導扭轉的分子構形)因此,彎曲形分子在水溶液中自組裝形成三級螺旋結構是第一個例子說明了非掌性香蕉形分子從分子規則性到三級掌性效應的傳遞過程

Self-assembly of achiral banana-shaped liquid crystalline molecules resulted in hierarchical superstructures with helical sense; suggesting the existence of hierarchical
chirality by self-assembling achiral bent-core molecules. Conformational chirality was induced with respect to molecular regularity (i.e., induced twist conformation with bent-core structure). Consequently, the helical superstructure from bent-core molecules with self-assembly in solution is the first example to express the chiral information transfer mechanism of achiral banana-shaped molecules from molecular regularity to hierarchical chirality.

Abstract…………………………………………………………………I
Contents.………………………………………………………………IV
List of Tables.………………………………………………………VI
List of Schemes………………………………………….................VII
List of Figures………………………………….……………….VIII
Chapter 1 Introduction………………………………………………1
1.1    Self-assembly and Supramolecular Chemistry…….…1
1.2    Self-assembly in Liquid Crystal……………………..2
1.3    Chiral Effect on Helical Self-Assembly…………...4
1.4    Theory of Tilted Chiral Lipid Bilayers (TCLB)…..7
1.5    Chirality in Liquid Crystal……………………….….9
1.6    Banana-Shaped Liquid Crystal…………………..……12
1.7    Origin of the Helix in Banana-Shaped molecules..18
Chapter 2 Objectives……………………………………………….57
Chapter 3 Experimental Section…………………………….……59
2.1 Materials………………………………………………...…….59
2.2 Experimental Instruments…………………………………….59
2.2.1 Differential scanning calorimetry (DSC)………………60
2.2.2 Polarized optical microscopy (POM)…………….……..60
2.2.3    Small-angle X-ray Scattering and Wide-angle X-ray Diffraction (SAXS & WAXD)………………...………...........61
2.2.4     Transmission Electron Microscopy (TEM)……………61
2.2.5     Scanning Probe Microscopy (SPM)………...…………62
2.2.6     Scanning Electron Microscopy (SEM)……...……….62
2.2.7     Ultraviolet-Visible Spectrum (UV) and Circular Dichroism (CD)…………………………………….…............62
2.3     Specimen preparation…………...………..………….63
Chapter 4     Results and Discussion...……….……….66
4.1     Thermal Behavior of Achiral Bent-core Liquid Crystals…….............................................66
4.2     Phase Characterization of Achiral Bent-Core Liquid Crystals………………………………………………………68
4.3    Self-assembly of Achiral Banana-Shaped Liquid Crystalline Molecules in Solution……………………........70
4.4     Self-assembled Superstructures in Solution………73
4.5     Structural Determination of Self-assembled Morphologies………………………………………………….......76
4.6     Proposed Mechanism for the Formation of Self-assembled Superstructures in solution…………………………78
Chapter 5    Conclusions…...…………………………………….…100
References………………………………………………………....102

                                

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