Stability of liquid crystal systems doped with γ-Fe2O3 nanoparticles

doi:10.1088/1674-1056/abeb11

中国物理B ›› 2021, Vol. 30 ›› Issue (9): 96101-096101.doi: 10.1088/1674-1056/abeb11

Stability of liquid crystal systems doped with γ-Fe₂O₃ nanoparticles

Xu Zhang(张旭)¹, Ningning Liu(刘宁宁)¹, Zongyuan Tang(唐宗元)¹, Yingning Miao(缪应宁)¹, Xiangshen Meng(孟祥申)², Zhenghong He(何正红)², Jian Li(李建)², Minglei Cai(蔡明雷)^3,4, Tongzhou Zhao(赵桐州)^3,4, Changyong Yang(杨长勇)^3,4, Hongyu Xing(邢红玉)¹, and Wenjiang Ye(叶文江)^1,†

1 School of Sciences, Hebei University of Technology, Tianjin 300401, China;
2 School of Physical Science and Technology, Southwest University, Chongqing 400715, China;
3 Hebei Jiya Electronics Co. Ltd., Shijiazhuang 050071, China;
4 Hebei Provincial Research Center of FPD Engineering Technology, Shijiazhuang 050071, China

收稿日期:2020-12-10 修回日期:2021-01-29 接受日期:2021-03-02 出版日期:2021-08-19 发布日期:2021-08-19
通讯作者: Wenjiang Ye E-mail:wenjiang_ye@hebut.edu.cn
基金资助:
Project supported by the Natural Science Foundation of Hebei Province of China (Grant Nos. A2019202235 and A2017202004), Research and Practice Project of Hebei Provincial Higher Education and Teaching Reform (Grant No. 2017GJJG018), Research Projects of Undergraduate Education and Teaching Reform in Hebei University of Technology (Grant No. 201802003), the Key Subject Construction Project of Hebei Provincial Universities, and the Special Project of China Association of Higher Education (Grant No. 21LKYB05).

Stability of liquid crystal systems doped with γ-Fe₂O₃ nanoparticles

1 School of Sciences, Hebei University of Technology, Tianjin 300401, China;
2 School of Physical Science and Technology, Southwest University, Chongqing 400715, China;
3 Hebei Jiya Electronics Co. Ltd., Shijiazhuang 050071, China;
4 Hebei Provincial Research Center of FPD Engineering Technology, Shijiazhuang 050071, China

Received:2020-12-10 Revised:2021-01-29 Accepted:2021-03-02 Online:2021-08-19 Published:2021-08-19
Contact: Wenjiang Ye E-mail:wenjiang_ye@hebut.edu.cn
Supported by:
Project supported by the Natural Science Foundation of Hebei Province of China (Grant Nos. A2019202235 and A2017202004), Research and Practice Project of Hebei Provincial Higher Education and Teaching Reform (Grant No. 2017GJJG018), Research Projects of Undergraduate Education and Teaching Reform in Hebei University of Technology (Grant No. 201802003), the Key Subject Construction Project of Hebei Provincial Universities, and the Special Project of China Association of Higher Education (Grant No. 21LKYB05).

摘要/Abstract

摘要： In order to explore the stability of a liquid crystal (LC) system doped with γ-Fe₂O₃ nanoparticles, the physical properties (clearing point, dielectric properties), electro-optical properties and residual direct-current voltage (RDCV) of the doped LC system were measured and evaluated at different times. First, the temperature was controlled by precision hot stage, and the clearing point temperature of doped LC was observed and measured by a polarized optical microscope. Using a precision LCR meter, we measured the capacitance-voltage curves of the doped LC system at the temperature of 27 ℃. The dielectric constant of doped LC was calculated by the dualcell capacitance method. Then, the electro-optical properties of the doped LC system were measured. Finally, the RDCV of the doped LC system was measured and calculated. After five months, the parameters of the doped LC system were re-measured and analyzed under the same conditions to evaluate its stability. The experimental results show that, within five months, the clearing point change rate of doped LC is in the range of 0.24%-1.37%, the change of dielectric anisotropy is in the range of 0.035-0.2, the curves of electro-optical properties are basically fitted, and the change rate of saturated RDCV is about 11.2%, which basically indicate that the LC system doped with γ-Fe₂O₃ nanoparticles has good stability.

关键词: γ-Fe₂O₃ nanoparticles, stability of liquid crystal system, clearing point, dielectric properties, electro-optical properties

Abstract: In order to explore the stability of a liquid crystal (LC) system doped with γ-Fe₂O₃ nanoparticles, the physical properties (clearing point, dielectric properties), electro-optical properties and residual direct-current voltage (RDCV) of the doped LC system were measured and evaluated at different times. First, the temperature was controlled by precision hot stage, and the clearing point temperature of doped LC was observed and measured by a polarized optical microscope. Using a precision LCR meter, we measured the capacitance-voltage curves of the doped LC system at the temperature of 27 ℃. The dielectric constant of doped LC was calculated by the dualcell capacitance method. Then, the electro-optical properties of the doped LC system were measured. Finally, the RDCV of the doped LC system was measured and calculated. After five months, the parameters of the doped LC system were re-measured and analyzed under the same conditions to evaluate its stability. The experimental results show that, within five months, the clearing point change rate of doped LC is in the range of 0.24%-1.37%, the change of dielectric anisotropy is in the range of 0.035-0.2, the curves of electro-optical properties are basically fitted, and the change rate of saturated RDCV is about 11.2%, which basically indicate that the LC system doped with γ-Fe₂O₃ nanoparticles has good stability.

Key words: γ-Fe₂O₃ nanoparticles, stability of liquid crystal system, clearing point, dielectric properties, electro-optical properties

中图分类号: (Liquid crystals)

61.30.-v

42.79.Kr (Display devices, liquid-crystal devices) 78.15.+e (Optical properties of fluid materials, supercritical fluids and liquid crystals)

Xu Zhang(张旭), Ningning Liu(刘宁宁), Zongyuan Tang(唐宗元), Yingning Miao(缪应宁), Xiangshen Meng(孟祥申), Zhenghong He(何正红), Jian Li(李建), Minglei Cai(蔡明雷), Tongzhou Zhao(赵桐州), Changyong Yang(杨长勇), Hongyu Xing(邢红玉), and Wenjiang Ye(叶文江). Stability of liquid crystal systems doped with γ-Fe₂O₃ nanoparticles[J]. 中国物理B, 2021, 30(9): 96101-096101.

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Stability of liquid crystal systems doped with γ-Fe₂O₃ nanoparticles

Stability of liquid crystal systems doped with γ-Fe₂O₃ nanoparticles

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