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Magnetic-field-induced Freedericksz transition of a nematic liquid crystal doped with diazophenyl

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Abstract

The Freedericksz transition induced by a perpendicular static magnetic field of a planar alignment nematic liquid crystal 4-amyl-4′-cyanodiphenyl(5CB) doped with trace 4[4′-(phenylazo)phenylazo]phenol (DAP) was studied. It was observed for the first time that the doped 5CB will dramatically decrease the magnetic field threshold compared to the pure 5CB while the conventional approach is doping with ferro-particles to decrease the magnetic field threshold. The results show that in this guest–host system, the guest DAP has much larger diamagnetic susceptibility anisotropy than pure 5CB and will force the 5CB molecule to reorientate under the lower magnetic field.

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Authors and Affiliations

  1. Institute of Polymer Science, School of Chemistry and Chemical Engineering, Zhongshan University, Guangzhou, 510275, China

    Wang Jian, Li Yu, Chen Yonglie & Liang Zhaoxi

  2. Department of Physics, Zhongshan University, Guangzhou, 510275, China

    Xiang Ying, Lin Ziyang & Shi Longpei

  3. State Key Laboratory of Ultrafast Laser Spectroscopy, Zhongshan University, Guangzhou, 510275, China

    Zhou Jianying

Authors
  1. Wang Jian
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  2. Li Yu
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  3. Chen Yonglie
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  4. Liang Zhaoxi
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  5. Xiang Ying
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  6. Lin Ziyang
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  7. Shi Longpei
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  8. Zhou Jianying
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Jian, W., Yu, L., Yonglie, C. et al. Magnetic-field-induced Freedericksz transition of a nematic liquid crystal doped with diazophenyl. Journal of Materials Science: Materials in Electronics 12, 597–599 (2001). https://doi.org/10.1023/A:1012449821801

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  • DOI: https://doi.org/10.1023/A:1012449821801

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