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研究生：	洪聖棋 Hung, Sheng-Chi
論文名稱：	奈米粒子結構大小對膽固醇液晶顯示器的光電特性改善 Structure and Size Effect of Nanoparticles on Cholesteric Liquid Crystal Devices
指導教授：	劉俊彥 Liu, Chun-Yen
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：	2022
畢業學年度：	110
語文別：	英文
論文頁數：	95
中文關鍵詞：	聚多巴胺粒子、纖維素粒子、膽固醇液晶關鍵字、高分子穩定型膽固醇液晶、遮光器
外文關鍵詞：	polydopamine particle, cellulose particle, cholesteric liquid crystal, polymer stabilized cholesteric liquid crystal, light shutter
相關次數：	點閱：50 下載：0
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液晶對於溫度、電場、磁場和應力等刺激很敏感，並表現出特有的驅動行為。因此，液晶對於顯示器、光柵和感測裝置具有極大的開發潛力。本研究中，為了製造液晶顯示器且提升膽固醇液晶顯示之光電性質，我們合成了一系列不同大小的聚多巴胺粒子。為了進一步提升對液晶顯示器的干擾效應，垂直配向劑(DMOAP)被用為對聚多巴胺粒子進行表面修飾，以達到微粒表面具有輻射狀結構。為了研究微粒結構對液晶排列的影響，我們更製備纖維素粒子和表面經輻射狀修飾後的纖維素粒子。製備後的聚多巴胺粒子和纖維素粒子被用於製造液晶顯示器。摻雜了表面修飾後的聚多巴胺粒子，成功的提升了膽固醇顯示器和高分子穩定型膽固醇液晶顯示器的光電效能。由於纖維素棒狀顆粒，具有較大長度、及較小直徑，未經輻射修飾的纖維素粒子，對液晶排列表現出更有效的干擾，從而達成了 97.4%的最高對比度。所製備的 PD2T 液晶顯示器，具有 2.92 V 的低閥值電壓和 13 ms 的快速響應時間。結果顯示，表面輻射修飾後的聚多巴胺粒子和表面未經改質的纖維素粒子，均成功且有效地提高了液晶顯示器的的光電特性。本研究成功的以微粒添加，取代了傳統表面配位層操控液晶分子，達成液晶顯示器設計。此為一新穎性設計，將為液晶顯示元件設計開啟一新穎性、低成本、且簡便的製作技術。

Liquid crystals are sensitive to temperature, electric field, magnetic field, and stress showing some specific actuations. As a result, liquid crystals offer enormous potential in the creation of display, grating, and sensing devices. In this study, to fabricate liquid crystal displays (LCD) and to improve the electrooptical properties of the cholesteric liquid crystal (CLC) devices, a series of polydopamine (PDA) particles with various sizes was synthesized. To further improve the disturbing effect on LCs, PDAs were modified using dimethyloctadecyl-3-(trimeth- oxysilyl)propyl ammonium chloride (DMOAP) revealing radial constructions. To study structure effect on LC arrangement, both cellulose nanoparticles (CNP) and DMOAP modified CNP particles were synthesized. The synthesized PDA and CNP particles were used for the fabrication of LCDs. Electro-optical properties of the fabricated LCDs doping with nanoparticles were studied. The synthesized radial constructed PDA particles successfully enhanced the electro-optical properties of CLC and PSCLC cells. Due to the long length and small diameter of Cellulose rod-like particle, the naked Cellulose particle shows more efficient disturbance on LC arrangement leads to the achievement of the highest contrast of 97.4%. The fabricated PD2T LC cell showed a low threshold voltage of 2.92 V and a fast response time of 13.00 ms. Based on the results, the modified PDA particles and non-modified cellulose particles successfully enhance the electro-optical properties of LC devices. This is a new skill for the fabrication of high performance, low cost, and easy processed LCD devices.

Abstract	I
中文摘要	III
致謝	V
Contents	VI
List of Schemes	IX
List of Figures	X
List of Tables	XVII
1. Introduction	1
1-1 Preface	1
1-2 Research Motivation	2
2. Literature Review	4
2-1 Introduction of Liquid Crystals	4
2-2 Classification of Liquid Crystals	6
2-3 Thermotropic Liquid Crystals	6
2-3-1 Nematic Liquid Crystal (NLC) Phase	8
2-3-2 Smectic Liquid Crystal (SmLC) Phase	9
2-3-3 Cholesteric Liquid Crystal (CLC) Phase[7]	10
2-3-4 Disc-like (Discotic) Liquid Crystals	17
2-4 Lyotropic Liquid Crystals	18
2-5 Physical Properties of Liquid Crystals	20
2-5-1 Anisotropic Properties of Liquid Crystals	20
2-5-2 Birefringence of Liquid Crystals[24]	21
2-5-3 Dielectric Properties of Liquid Crystals	23
2-6 Polymer-Liquid Crystal Composites	24
2-6-1 Polymer Stabilized Cholesteric Liquid Crystals (PSCLCs)	26
2-7 Additives in Liquid Crystal System	28
2-8 Properties of Polydopamine (PDA)[35, 36]	29
2-9 Properties of Cellulose Nanoparticles[39]	31
3. Experimental Section	34
3-1 Materials	34
3-2 Instruments	35
3-3 Experimental Process	36
3-3-1 Synthesis and Modification of Polydopamine (PDA) Particles and Cellulose Nanoparticles	36
3-3-2 Preparation of Cholesteric Liquid Crystal Cells	39
3-3-3 Preparation of CLC and PSCLC Mixtures	40
3-3-4 Fabrication of CLC and PSCLC Cells	42
3-3-5 Measurement of Electro-Optical Properties	45
4. Results and Discussion	47
4-1 Characterization of Particles	47
4-1-1 SEM Image of Polydopamine Particles	47
4-1-2 Hydrophilicity of Polydopamine Particles	48
4-1-3 AFM Image of Cellulose Particles	50
4-1-4 Dynamic Light Scattering (DLS) Spectrometer Analysis of Particles	51
4-2 Characterization of Particles Doped CLC	52
4-2-1 POM Textures of CLC Cell	52
4-2-2 Thermal Properties Analysis	55
4-2-3 Electro-Optical Properties of Particle Doped CLC Cells	57
4-3 Characterization of Particle Doped PSCLC	68
4-3-1 Thermal Properties of PSCLC Mixtures	69
4-3-2 Electro-Optical Properties of Particle Doped PSCLC Cells	70
4-4 Characterization of Different Particle Sizes Doped LC Cell	82
4-5 Stability of LC cells	88
5. Conclusions	89
6. References	90
                                    

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校內：2025-08-31公開
校外：2025-08-31公開

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