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研究生：	周茗蕙 Chou, Ming-Hui
論文名稱：	以高分子固定溶致型液晶光子晶體結構之研究 Fixing of Lyotropic Cholesteric Liquid Crystalline Photonic Constructions via Predesigned Polymer Matrixes
指導教授：	劉瑞祥 Liu, Jui-Hsiang
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：	2022
畢業學年度：	110
語文別：	英文
論文頁數：	74
中文關鍵詞：	可調式結構色、溶致型膽固醇液晶、布拉格反射、液晶水膠複合材料、壓力感測器
外文關鍵詞：	Tunable structural color, Lyotropic cholesteric liquid crystal, Bragg reflection, Liquid crystal hydrogels, Stress sensor
相關次數：	點閱：30 下載：0
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自然界中有豐富的結構色，一些生物在外界刺激下會改變其呈色結構。在此項研究中，以溶致型膽固醇液晶模擬生物的結構色變化。膽固醇液晶為一種一維光子晶體，具有獨特的螺旋結構，並呈現布拉格反射，反射特定波長的光。本實驗將具有手性的高分子羥丙基纖維素(HPC)以適當濃度溶解在溶劑中，並透過自組裝形成溶致型膽固醇液晶相，以呈現特定顏色。透過調整HPC的含量，可影響膽固醇液晶的螺距，並反射不同波段的光。為了穩定膽固醇液晶相，本研究設計了一個帶有戊二醛（GA）交聯劑的水膠聚合物網狀結構。所合成的高分子穩定化液晶水膠表現出明顯的抗壓性，並可在外部刺激下表現出顏色變化，如伸長、壓縮和彎曲。這種現象歸因於螺旋結構的可逆性變化。值得注意的是，當HPC在水中並處於液晶相時會顯示顏色。然而，在乾燥後將會變為無色。相反地，本研究所合成的高分子穩定化液晶水膠，在乾燥後仍然保留彩色的外觀。這些結果歸因於，水膠網狀結構的穩定和戊二醛的交聯作用。此結果表明，透過高分子網狀結構和交聯劑，可固定溶致型膽固醇液晶的螺旋結構。這種製造穩定結構色的新技能，拓展了結構色在功能性材料上的應用。

In this study, a series of lyotropic cholesteric liquid crystals was synthesized and investigated to simulate the color variation of biological systems. Cholesteric liquid crystal is a kind of one-dimensional photonic crystal with a unique helical structure exhibiting Bragg reflection. The chiral polymer hydroxypropyl cellulose (HPC) was dissolved in a solvent at an appropriate concentration, and the cholesteric phase was formed by selfassembly. Adjusting the content of HPC reflects the incident light in different wavelengths. To stabilize the color constructions, a polymer network of hydrogel with glutaraldehyde (GA) crosslinking agent was designed. The synthesized crosslinked lyotropic liquid crystal hydrogels show significant pressure resistance and exhibit color variation by external stimulation such as elongation and compression. This phenomenon is ascribed to the reversible change of the helix construction. It is noteworthy that HPC shows colors in water when it's in the lyotropic phase. However, after drying, it becomes colorless. Oppositely, the synthesized HPC xerogel stabilized by the predesigned polymer matrixes still shows colorful appearance. The results are ascribed to the stabilization of the hydrogel matrixes and the glutaraldehyde crosslinking effect. The results indicate that the helical construction of lyotropic liquid crystals was fixed via the predesign of coexisting polymer matrixes and crosslinking agents. This skill to produce stable xerogel structure colors broadens the application of structure colors on functional materials.

Abstract I
中文摘要 II
誌謝 III
Contents IV
List of Tables VII
List of Figures VIII
1. Introduction 1
1-1 Preface 1
1-2 Research Motivation 3
2. Literature Review 4
2-1 Introduction of Liquid Crystals 4
2-2 Classification of Liquid Crystals 6
2-2-1 Thermotropic Liquid Crystals 7
2-2-2 Lyotropic Liquid Crystals 14
2-3 Physical properties of Liquid Crystals 15
2-3-1 Anisotropic Properties of Liquid Crystals 15
2-3-2 Birefringence of Liquid Crystals 16
2-3-3 Dielectric Properties of Liquid Crystals 17
2-4 Introduction of Structural Colors 18
2-4-1 Structural Colors Based on Photonic Crystals 19
2-4-2 Tunable Structural Colors 22
2-4-3 Structure Colors Based on Cholesteric Liquid Crystals	24
2-5 Introduction of Cellulose 25
2-5-1 Self-Assembly of Cellulose and Water 26
2-5-2 Cellulose-Based Liquid Crystal 27
2-5-3 Introduction of Hydroxypropyl cellulose 28
2-6 Introduction of hydrogels 29
2-6-1 Application of Hydrogel-Based Materials 30
2-7 Introduction of Photonic Crystal Hydrogels 31
2-7-1 Applications of Photonic Crystal Hydrogels 32
2-7-2 Photonic Liquid Crystal Hydrogels 33
3. Experimental Section 34
3-1 Materials 34
3-2 Instruments 35
3-3 Synthesis of Compounds 36
3-3-1 Fabrication of Crosslinked Liquid Crystal Hydrogels 36
3-3-2 Dynamic Mechanical Analysis 39
3-3-3 SEM Morphology Observation 40
3-3-4 Color Variations of Crosslinked Liquid Crystal Hydrogels 41
4. Results and Discussion 42
4-1 Crosslinking of Hydrogels via Glutaraldehyde 42
4-2 Fabrication of Crosslinked Lyotropic LC Hydrogels 44
4-3 Characterization of Crosslinked LC Hydrogels 45
4-3-1 Effect of Crosslinking Degree 45
4-3-2 Optical Properties of Crosslinked LC Hydrogels 47
4-3-3 SEM Morphology of Crosslinked LC Hydrogels 50
4-3-4 Thermal Properties of Crosslinked LC Hydrogels 51
4-3-5 Mechanical Properties of Crosslinked LC Hydrogels 53
4-4 Color Variation of Crosslinked LC Hydrogels 58
4-4-1 Stretching Induced Color Variations 59
4-4-2 Stress Induced Color Variation 60
4-4-3 Stress sensitivity of Crosslinked LC Hydrogels 61
4-4-4 Stability of Lyotropic Liquid Crystals 63
Conclusions 66
References 67
                                    

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校內：2025-08-31公開
校外：2025-08-31公開

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