NMR Study of a Bimesogenic Liquid Crystal with Two Nematic Phases

NMR Study of a Bimesogenic Liquid Crystal with Two Nematic Phases
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具有两个向列相的双液晶液晶的核磁共振研究

DOI:
10.1080/15421406.2015.1025211
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发表时间:
2015
影响因子:
0.7
通讯作者:
Burnell E
Burnell E
中科院分区:
化学4区
文献类型:
--
作者:
Burnell E

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最近的兴趣,双介晶液晶显示两个双折射相,导致我们调查的双折射平均场相互作用,在这些双折射相使用刚性溶质作为探针。用两个独立的Maier-Saupe项模拟的双极性势能较好地拟合39wt%的4-正戊基-4 ′-氰基联苯(5CB)在α,ω-双(4-4′-氰基联苯)壬烷(CB_C9_CB)中双极性相中对、Meta、邻二氯苯溶质的偶极耦合(序参数)。我们将讨论N相和Nb相中每种溶质的液晶势参数G1和G2。最有趣的观察是,G1(与尺寸和形状相互作用有关)在Ntb相中几乎是恒定的,而G2(与长程静电相互作用有关)有很大的变化,甚至改变符号。
Recent interest in bimesogenic liquid crystals showing two nematic phases has led us to investigate the nematic mean-field interactions in these nematic phases by using rigid solutes as probes. The nematic potential that is modelled by two independent Maier-Saupe terms is successful in fitting the observed dipolar couplings (order parameters) ofpara-,meta- andortho-dichlorobenzene solutes in both the nematic phases of 39 wt% of 4-n-pentyl-4′-cyanobiphenyl (5CB) in α,ω-bis(4-4′-cyanobiphenyl)nonane (CB_C9_CB) to better than the 5% level. The derived liquid-crystal potential parametersG1andG2for each solute in the N and Ntbphases will be discussed. The most interesting observation is thatG1(associated with size and shape interactions) is almost constant in the Ntbphase, whereasG2(associated with longer-range electrostatic interactions) has large variation, even changing sign.
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