硫醇修飾筒型盤狀分子形成自組裝單層膜對液晶分子排列之調控研究

Manipulation of Molecular Alignments of Liquid Crystalline Molecules by Self-assembled Monolayers of Thiol-Funcationalized Discogens

江健鴻(Chien-Hung C hiang)

指導教授 ： 徐秀福

淡江大學/理學院/化學學系碩士班/碩士(2009年)

https://doi.org/10.6846/TKU.2009.00404

摘要

具硫醇官能基之盤形液晶分子17a與17b已被合成。其液晶性質已藉由偏光顯微鏡、為差分析儀與粉墨X光繞射儀鑑定。在升溫過程中，化合物17a先形成筒型液晶相後再形成盤形向列型液晶相；化合物17b則形成筒型液晶相。化合物17a與17b分別經由化學吸附法形成自組裝單層膜。盤形液晶材料化合物15a、23a、23b與23c於自組裝單層膜上之排列模式已經由偏光顯微鏡所鑑定。化合物17a與17b所製備之自組裝單層膜能藉由光學紋理圖證實具有能大範圍排列盤形液晶分子的性質。

關鍵字

盤形 ； 筒型液晶 ； 自組裝單層膜

並列摘要

Two thiol-funcationalized discotic liquid crystalline mesogens, 17a and 17b have been synthesized. Their liquid crystalline properties were studied using polarizing optical microscopy, differential scanning calorimetry, and powder X-ray diffraction. Upon heating, 17a showed a columnar phase followed by a discotic nematic phase. On the other hand, 17b exhibited only a columnar mesophase within a wide temperature range. Self-assembled monolayers (SAMs) have been prepared by chemisorption of 17a and 17b individually from dilute solutions. Alignment behaviors of discotic liquid crystalline materials 15a, 23a, 23b, and 23c on the above mentioned SAMs have been investigated by polarizing optical microscopy. These SAMs showed significant aligning ability as indicated by optical textures of the discotic columnar mesogens.

並列關鍵字

discotic ； columnar liquid crystal ； self-assembled monolayers

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