| 时间分辨与偏振红外光谱研究电场诱导下手性反铁电液晶的 … |
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| 引用本文： | 赵冰 Verma,AL.时间分辨与偏振红外光谱研究电场诱导下手性反铁电液晶的 …[J].光谱学与光谱分析,2000,20(5):598-600. |
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| 作者姓名： | 赵冰 Verma AL |
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| 作者单位： | 吉林大学超分子结构与谱学开放实验室,长春 |
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| 基金项目： | 国家自然科学基金!重点项目 ( 96330 1 0 )资助课题 |
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| 摘 要： | 手性反铁电液晶分子中的各个不同片段、不同基团在电场诱导下展现不同的取向与取向分布。在交变电场的作用下，分子中各个部分的翻转动力学行为也表现的不同。
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| 关 键 词： | 偏振红外光谱 手性反铁电液晶 翻转动力学 |
The Dynamics of Electric-field-induced Molecular Reorientation and Segmental Mobility in the Antiferroelectric LCs Studied by Time-resolved FTIR Spectroscopy |
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| Bing ZHAO,A L Verma,Yukihiro OZAKI.The Dynamics of Electric-field-induced Molecular Reorientation and Segmental Mobility in the Antiferroelectric LCs Studied by Time-resolved FTIR Spectroscopy[J].Spectroscopy and Spectral Analysis,2000,20(5):598-600. |
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| Authors: | Bing ZHAO A L Verma Yukihiro OZAKI |
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| Institution: | Key Laboratory of Supramolecular Structure and Spectroscopy, Jilin University, 130023 Changchun. |
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| Abstract: | We employed dynamic and polarized infrared spectroscopy to monitor the response of different molecular segments to external electric fields. Measurements of absorbance changes of the representative IR bands as a function of the polarization rotation angle at 109 degrees C under DC electric fields of 0.15 and -15 V determine mutual arrangement of different molecular segments in their equilibrium state in the helicoidal Sm-CA* phase (0 V) and field-induced, unbound Sm-C phase (15 and -15 V). It is clear from the normalized absorbance changes dAn vs wave electric field at 5 KHz repetition rate that the different segments complete the reorientation at different time scales. The core moves faster and takes approximately 33 microseconds to complete the reorientation, while it takes approximately 64 microseconds for the alkyl chains and the C=O group. |
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| Keywords: | Polarized infrared spectroscopy Time resolution External electric fields |
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