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首页> 外文期刊>Molecular Crystals & Liquid Crystals >On the Nature of Molecular Associations, Static Permittivity and Dielectric Relaxation in a Uniaxial Nematic Liquid Crystal
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On the Nature of Molecular Associations, Static Permittivity and Dielectric Relaxation in a Uniaxial Nematic Liquid Crystal

机译：单轴向列液晶中分子缔合，静态介电常数和介电弛豫的性质

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One fluorinated terphenyl compound was studied by polarizing microscopy, x-ray diffraction and dielectric spectroscopy. It exhibits the nematic phase over a range of 107.80. The average intermolecular distance was observed to be more than in systems without any lateral fluorine substitution. Apparent molecular length was found to be more than the molecular model length, suggesting presence of antiparallel molecular associations. Optimized geometry, obtained by molecular modeling, yielded a dipole moment of 6.68 D. The observed principal dielectric constants are consistent with respective components of dipole moments and show quite a high value of dielectric anisotropy. The threshold voltage and the splay elastic constant have also been determined. Flip-flop mode dielectric relaxation frequency is found to increase with temperature, and the activation energy for the process is found to be 35.53 kJ mol-1.View full textDownload full textKeywordsActivation energy, dielectric and elastic constants, dielectric anisotropy, flip-flop relaxation mode, molecular association, terphenyl fluorinated nematicRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/15421406.2012.686369
机译：通过偏振显微镜，X射线衍射和介电谱研究了一种氟化三联苯化合物。它在107.8 0 范围内显示向列相。观察到平均分子间距离大于没有任何侧向氟取代的系统中的分子间距离。发现表观分子长度大于分子模型长度，表明存在反平行分子缔合。通过分子建模获得的优化几何结构产生了6.68 D的偶极矩。观察到的主要介电常数与偶极矩的各个分量一致，并且显示出很高的介电常数值。还已经确定了阈值电压和张开弹性常数。触发器模式介电弛豫频率随温度增加而增加，该过程的活化能为35.53 kJ mol -1 。查看全文下载全文关键字活化能，介电常数和弹性常数介电常数各向异性，触发器松弛模式，分子缔合，三氟苯基向列氟化物相关的变量，more“，pubid：” ra-4dff56cd6bb1830b“};添加到候选列表链接永久链接http://dx.doi.org/10.1080/15421406.2012.686369

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