项目来源

台湾省政府科研基金(GRB)

项目主持人

刘瑞祥

项目受资助机构

台湾省成功大学化学工程学系（所）

项目编号

MOST105-2923-E006-007

立项年度

2016

立项时间

未公开

研究期限

未知 / 未知

项目级别

省级

受资助金额

1900.00千元台币

学科

光电工程

学科代码

未公开

基金类别

应用研究/学术补助

关键词

光学活性化合物 ; PDLC液晶膜 ; 液晶感测器 ; 布拉格反射 ; 紫外光谱 ; Chiral compounds ; PDLC liquid crystal films ; Liquid crystal sensing devices ; Bragg’s reflection ; UV-vis spectrometry

参与者

未公开

参与机构

未公开

项目标书摘要：光学活性化合物具有立体特异性，可以呈现出立体配位特性，使场效应下的有机材料表现出异方性物理特性，例如立体结构上的不对称螺旋结构诱导，或呈现立体选择性及立体特异性等。本研究计划拟合成出一系列光学活性有机化合物，将之与市售向列性液晶掺混，用以诱导出具有特殊螺旋距的胆固醇液晶相。除了制备液晶分散膜(PDLC)以外，更将以本研究室所研发的光聚合制程，制备出高分子分散液晶膜，或复制出具有螺旋结构的异方性高分子膜(光子晶体薄膜)。所复制的光子晶体膜，若使含浸不同液体、或气体，其将因折射率之不同而呈现出不同颜色，以及改变UV-vis光谱；以此方式即可设计出气体或液体的感测器，也是一种将感测机能可视化的技术。本计划将分为下列三年子计划，逐步完成最终的感测元件应用。光学诱导液晶薄膜制备及其在感测元件上的应用研究 Investigation of the structure transitions in polymer-stabilized liquid crystals induced by light irradiation and adsorption for sensor devices 第一年计划光学活性化合物及多官能基单体的合成 Synthesis of Chiral Compounds and Multifunctional Monomers 本年度将合成一系列具有光学活性中心的化合物或单体，使该些化合物具有光学活性，同时亦具有多种官能性基团，例如羧基、胺基、氢氧基等。所导入的基团将可以与感测系统中的液晶化合物，或是未来聚合成高分子後，与充填於系统中的被感测化合物等，产生相互作用力，以达成感测元件的识别功能。详细的光学活性化合物、单体设计，将於研究步骤项中详细叙述。所合成的光学活性化合物，将使用FTIR及NMR等加以监定分子结构。光学活性值，将以旋光度计量测,UV光谱及萤光光谱特性，也将会有详细探讨。由於未来将使用UV-vis光谱进行感测元件设计，光波长为介於200nm至400nm(UV波段),及400nm至800nm(可见光波段)间，因此微小的分子间作用力，例如光学活性化合物与液晶材料间的作用力等，可被期待具有明显的光谱变化。第二年计划液晶螺旋距的调配及光子晶体薄膜的制备 Adjusting of Liquid Crystal Pitches and Fabrication of Photonic Films 本年度计划将使用第一年所合成的光学活性化合物掺混市售液晶，调配出具有螺旋距的胆固醇型及层列型液晶材料。光学活性化合物在液晶中的含量，会影响螺旋距的大小。以掺混浓度调配液晶螺旋距的研究，将会有一系列详细探讨。液晶成分中将掺混单体，以光聚合法制备具有光子结构的高分子薄膜。所制备的液晶薄膜(PDLC)及光子复制薄膜在UV-vis的吸收光谱，也将有详细探讨。未来将以环境待测物、或预计感测物对液晶薄膜的物理变化量，探讨外力对液晶在UV-vis光谱的变化进行感测系统设计。第三年计划液晶感测元件制备及感测特性探讨 Fabrication and Characterization of Liquid Crystalline Sensing devises 本年度将以过去二年所得结果，进行液晶感测元件设计。利用外力，例如温度、压力对液晶螺旋距的影响，进而改变液晶膜反射光颜色(布拉格反射现象),造成在UV-vis吸收光谱变化；利用此原理可以计测微量温度、压力变化以及有毒物质侦测。又，前一年所制得的PDLC膜及光子结构薄膜，会因为所注入微结构体中的待测物的折射率不同，而展现出不同的布拉格效应，直接显现於UV-vis吸收光谱中。利用该些外力及化合物种类所造成的影响，可以设计成检测元件。本年度将针对所合成材料及所制备高分子薄膜进行一系列感测器设计，预计可以完成高感度液晶感测元件的制备及检量计测。

Application Abstract: Chiral compounds usually real stereo-specificity showing stereo specific coordination properties.In the presence of chiral field effect,compounds reveal significant asymmetric physical properties,for example,induction of asymmetric helical structure,showing stereo-selectivity and stereo-specificity.In this study we are going to synthesize a serious of chiral compounds,blending of the synthesized compounds with commercially available liquid crystals leads to the formation of cholesteric and chiral smectic liquid crystals.Fabrication of polymer dispersed liquid crystal films(PDLC)and photonic liquid crystalline films imprinted from cholesteric liquid crystals using the method developed in our lab via UV-irradiation will be carried out.Compounds and gas filled in the imprinted films may change the refractive index of the films leads to the variation of reflected color as well as UV-vis spectra.Liquid crystalline sensing devices will be designed using such materials and skills.This research program consists of following three yearly subtitles.光学诱导液晶薄膜制备及其在感测元件上的应用研究 Investigation of the structure transitions in polymer-stabilized liquid crystals induced by light irradiation and adsorption for sensor devices 1st Year Program Synthesis of Chiral Compounds and Multifunctional Monomers In the 1st year,a serious of predesigned chiral compounds will be synthesized.Some of functional groups will be introduced onto those chiral compounds,for example,carboxyl,amino and hydroxyl groups.The introduced functional groups may interact with liquid crystals and the synthesized polymer matrixes.Such interaction may cause some physical properties change,for example,refractive index change and UV-vis absorption variation leads to the achievement of materials and surrounding change sensing.Deatiled synthetic process and materials structure will be described in the term of Study methods.The synthesized chiral compounds and monomers will be identified using FT-IR and H-NMR.Optical activities will be estimated using automatic polarimetry.UV-vis spectra of the synthesized compounds will also be measured.Wavelength of UV-vis spectra is between 200nm to 400nm(UV range),and 400nm to 800nm(visible range).Accordingly,a small variation of surrounding change is expected to be detected via nm size sensing ability of the predesigned liquid crystalline sensing devices.2nd Year Program Adjusting of Liquid Crystal Pitches and Fabrication of Photonic Films Chiral compounds synthesized in the first year will be used to blend with commercially available smectic and nematic liquid crystals for the fabrication of cholesteric liquid crystals with different pitches.Concentration of chiral compounds in liquid crystal mixture may affect the pitch of liquid crystals such prepared.Study of the effect of chiral compounds on liquid crystal pitch variations will be carried out.Multifunctional monomers will be doped into the mixture for the imprinting of photonic crystal constructions via UV-polymerization.UV-vis spectrometry of the prepared PDLC films and the imprinted photonic films will be investigated.Effect of surrounding materials and condition changes on the fabricated PDLC films and photonic crystal films is expected to be sensed by the variation on the UV-vis spectra.The functions and the properties of the predesigned liquid crystal induced films will be used for the fabrication of sensing devices.3rd Year Program Fabrication and Characterization of Liquid Crystalline Sensing devises Results observed in the first two years will used for the fabrication of liquid crystalline sensing devices.Variations of the materials and conditions in surrounding may interact with the fabricated liquid crystalline films leads to changes of reflection color due to Bragg’s reflection.The small amount of the change may be detected showing in UV-vis spectra.By using such skill,the fabricated sensing devices can be used for the detection of temperature and pressure changes and presence of toxic materials.Theoretically,depending on the materials inside the matrixes,the PDLC films and the imprinted photonic crystalline films show different colors due to Bragg’s reflection.The variations could be seen in UV-vis spectra.This is a kind of visualization of sensing functions.In this year,some high sensitivity liquid crystalline devices are expected to be fabricated using the described skills.

项目受资助省

台湾省