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研究生:陳彥豪
研究生(外文):Yen-Hao Chen
論文名稱:層列A型液晶摻雜奈米粒子之物理特性研究
論文名稱(外文):Investigation on characteristics of Smectic A liquid crystals doped by nanoparticles
指導教授:陳惠玉陳惠玉引用關係
指導教授(外文):Hui-Yu Chen
學位類別:碩士
校院名稱:逢甲大學
系所名稱:光電研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:中文
論文頁數:101
中文關鍵詞:鈦酸鋇層列A型鐵電性奈米粒子液晶摻雜
外文關鍵詞:ferroelectricBaTiO3Liquid crystalNanoparticleDopantSmectic A
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本論文主要研究低濃度鐵電性奈米粒子鈦酸鋇(BaTiO3)摻雜於層列A型液晶8CB之物理特性,論文中以無添加分散劑之低摻雜濃度( )樣品進行研究討論。
論文中將分別以光學測量、電性參數測量進行討論,其中光學特性量測包含有:向列相反應時間、層列A相之高低頻反應時間,以及層列A相之複折射率。電性參數測量包含:向列相和層列A相之閾值電壓、介電異方性,向列相之旋轉黏滯係數、扇張彈力常數,以及層列A相之離子濃度。
實驗中為了排除分散劑可能造成的影響,本論文採用低濃度摻雜,且未使用任何分散劑。論文中討論鐵電性奈米粒子摻雜於層列A型液晶是目前文獻鮮少討論的部分,所以本論文首開先例測量討論鐵電性奈米粒子在具有層狀結構之層列A型液晶中所造成之影響。
實驗中發現低濃度鐵電性奈米粒子摻雜入層列A型液晶中,並未改變相變溫度與複折射率和降低閾值電壓。此外,經由實驗發現,儘管摻雜濃度相當低,對旋轉黏滯度的影響也是相當的顯著。
In this study, the influences of the ferroelectric nanoparticles doped in liquid crystal with nematic and smectic A phases on the physical properties have been discussed. In order to distinguish the contribution of this thesis with similar previous studies (heavy dopant), a dilute concentration of the nanoparticle in the liquid crystal was controlled under 0.2 wt% and the effect of the nanoparticle on the smectic A phase was carried out. Here, the dielectric constants, rotational viscosity, elastic constant, birefringence, phase transition temperature, threshold voltage and response time were measured in pure and doped systems. The experimental results display that under the low-concentration doping ferroelectric nanoparticle liquid-crystal cells, the most physical parameters of the liquid crystals were not affected by the nanoparticels. The conclusion was quiet different from the report in the previous studies. Otherwise, the rotational viscosity was reduced by doping nanoparticle, which in turn decreasing the relaxation process of the liquid crystal director.
目錄
致謝----------------------------------------------------------------------------------i
中文摘要---------------------------------------------------------------------------ii
英文摘要--------------------------------------------------------------------------iii
目錄--------------------------------------------------------------------------------iv
圖目錄----------------------------------------------------------------------------vii
表目錄-----------------------------------------------------------------------------xi
第一章 序論----------------------------------------------------------------------1
第二章 液晶簡介---------------------------------------------------------------11
2-1 液晶的分類------------------------------------------------------------11
2-1.1向列相-----------------------------------------------------------12
2-1.2 層列相---------------------------------------------------------13
2-1.3膽固醇相-------------------------------------------------------13
2-2 液晶物理特性---------------------------------------------------------15
2-2.1 彈性係數------------------------------------------------------15
2-2.2 介電常數------------------------------------------------------16
2-2.3複折射率-------------------------------------------------------18
2-2.4黏滯度-----------------------------------------------------------20
2-3 電場作用下之向列型液晶轉動------------------------------------22
2-3.1閾值電壓-------------------------------------------------------22
2-3.2反應時間-------------------------------------------------------25
2-4 電場作用下之層列A型液晶轉動---------------------------------28
第三章 各項參數測量技術與樣品製作和實驗裝置---------------------31
3-1 液晶介電異方值------------------------------------------------------31
3-2 閾值電壓---------------------------------------------------------------34
3-3 彈力常數---------------------------------------------------------------35
3-4 旋轉黏滯係數---------------------------------------------------------35
3-5 折射率異方值---------------------------------------------------------40
3-6 反應時間測量---------------------------------------------------------44
3-7 樣品製作---------------------------------------------------------------46
3-8實驗裝置----------------------------------------------------------------47
第四章 實驗結果與討論------------------------------------------------------49
4-1 向列相之各項物理參數---------------------------------------------50
4-1.1向列相之介電異方值----------------------------------------50
4-1.2向列相之彈力常數-------------------------------------------57
4-1.3向列相之旋轉黏滯係數-------------------------------------59
4-1.4向列相之閾值電壓-------------------------------------------66
4-1.5向列相之上升時間-------------------------------------------67
4-1.6向列相之下降時間-------------------------------------------69
4-2 層列A相之各項參數------------------------------------------------72
4-2.1層列A相之複折射率-----------------------------------------72
4-2.2層列A相之閾值電壓-----------------------------------------73
4-2.3層列A相之高頻反應時間-----------------------------------77
4-2.4層列A相之低頻反應時間-----------------------------------79
4-3 DSC測量數據---------------------------------------------------------81
4-4 層列A相樣品之偏光顯微鏡觀測---------------------------------83
第五章 結論---------------------------------------------------------------------85
參考文獻---------------------------------------------------------------86









圖目錄
圖1.1-------------------------------------------------------------------------------3
圖1.2-------------------------------------------------------------------------------4
圖1.3-------------------------------------------------------------------------------5
圖1.4-------------------------------------------------------------------------------5
圖1.5-------------------------------------------------------------------------------6
圖1.6-------------------------------------------------------------------------------7
圖2-1.1---------------------------------------------------------------------------12
圖2-1.2---------------------------------------------------------------------------13
圖2-2.1---------------------------------------------------------------------------15
圖2-2.3---------------------------------------------------------------------------19
圖2-2.4---------------------------------------------------------------------------20
圖2-3.1---------------------------------------------------------------------------22
圖2-4.1---------------------------------------------------------------------------28
圖3-1.1---------------------------------------------------------------------------31
圖3-1.2---------------------------------------------------------------------------32
圖3-1.3---------------------------------------------------------------------------32
圖3-2.1---------------------------------------------------------------------------34
圖3-4.1---------------------------------------------------------------------------37
圖3-4.2---------------------------------------------------------------------------37
圖3-4.3---------------------------------------------------------------------------39
圖3-5.1---------------------------------------------------------------------------40
圖3-5.2---------------------------------------------------------------------------41
圖3-6.1---------------------------------------------------------------------------44
圖3-6.2---------------------------------------------------------------------------45
圖4-1.1.a-------------------------------------------------------------------------51
圖4-1.1.b-------------------------------------------------------------------------55
圖4-1.1.c-------------------------------------------------------------------------55
圖4-1.1.d-------------------------------------------------------------------------56
圖4-1.1.e-------------------------------------------------------------------------56
圖4-1.2.a-------------------------------------------------------------------------58
圖4-1.2.b-------------------------------------------------------------------------58
圖4-1.3.a-------------------------------------------------------------------------60
圖4-1.3.b-------------------------------------------------------------------------60
圖4-1.3.c-------------------------------------------------------------------------60
圖4-1.3.d-------------------------------------------------------------------------61
圖4-1.3.e-------------------------------------------------------------------------61
圖4-1.3.f-------------------------------------------------------------------------61
圖4-1.3.g-------------------------------------------------------------------------62
圖4-1.3.h-------------------------------------------------------------------------62
圖4-1.3.i-------------------------------------------------------------------------62
圖4-1.3.j-------------------------------------------------------------------------63
圖4-1.3.k-------------------------------------------------------------------------63
圖4-1.3.l-------------------------------------------------------------------------63
圖4-1.3.m------------------------------------------------------------------------64
圖4-1.3.n-------------------------------------------------------------------------64
圖4-1.3.o-------------------------------------------------------------------------64
圖4-1.3.p-------------------------------------------------------------------------65
圖4-1.4---------------------------------------------------------------------------66
圖4-1.5---------------------------------------------------------------------------68
圖4-1.6.a-------------------------------------------------------------------------70
圖4-1.6.b-------------------------------------------------------------------------70
圖4-2.1---------------------------------------------------------------------------72
圖4-2.2.a-------------------------------------------------------------------------73
圖4-2.2.b-------------------------------------------------------------------------73
圖4-2.2.c-------------------------------------------------------------------------74
圖4-2.2.d-------------------------------------------------------------------------74
圖4-2.2.e-------------------------------------------------------------------------75
圖4-2.2.f-------------------------------------------------------------------------76
圖4-2.3---------------------------------------------------------------------------77
圖4-2.4---------------------------------------------------------------------------79
圖4-3.a---------------------------------------------------------------------------81
圖4-3.b---------------------------------------------------------------------------81
圖4-4.1---------------------------------------------------------------------------83
圖4-4.2---------------------------------------------------------------------------83
圖4-4.3---------------------------------------------------------------------------84














表目錄
表2-2.4---------------------------------------------------------------------------21
表4-1.1---------------------------------------------------------------------------53
表4-1.4---------------------------------------------------------------------------66
表4-1.5---------------------------------------------------------------------------68
表4-1.6---------------------------------------------------------------------------71
表4-2.3---------------------------------------------------------------------------77
表4-2.4---------------------------------------------------------------------------79
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