Ultrasonic effect on lyotropic chiral nematic liquid crystal of cellulose nanocrystal

LIU Si-tong; ZHANG Da-wei; PIAO Guang-zhe

doi:10.3788/YJYXS20153002.0229

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Ultrasonic effect on lyotropic chiral nematic liquid crystal of cellulose nanocrystal

Material Physics & Chemistry | 更新时间：2020-08-12

- Ultrasonic effect on lyotropic chiral nematic liquid crystal of cellulose nanocrystal
- Chinese Journal of Liquid Crystals and Displays Vol. 30, Issue 2, Pages: 229-233(2015)
- 作者机构：
  
  青岛科技大学橡塑材料工程教育部重点实验室高分子科学与工程学院,山东青岛,266042
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20153002.0229
  CLC： TN141
- Received：01 October 2014，
  
  Revised：03 November 2014，
  
  Published Online：05 November 2014，
  
  Published：05 April 2015
- 稿件说明：
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刘思彤, 张大为, 朴光哲. 超声对纤维素纳米晶体的溶致胆甾相液晶的影响[J]. 液晶与显示, 2015,30(2): 229-233

LIU Si-tong, ZHANG Da-wei, PIAO Guang-zhe. Ultrasonic effect on lyotropic chiral nematic liquid crystal of cellulose nanocrystal[J]. , 2015,30(2): 229-233
刘思彤, 张大为, 朴光哲. 超声对纤维素纳米晶体的溶致胆甾相液晶的影响[J]. 液晶与显示, 2015,30(2): 229-233 DOI： 10.3788/YJYXS20153002.0229.

LIU Si-tong, ZHANG Da-wei, PIAO Guang-zhe. Ultrasonic effect on lyotropic chiral nematic liquid crystal of cellulose nanocrystal[J]. , 2015,30(2): 229-233 DOI： 10.3788/YJYXS20153002.0229.

摘要

通过偏光显微镜法、紫外-可见光光谱学、XRD和电导率分析方法研究了大功率超声对纤维素纳米晶体(CNC)的溶致胆甾相液晶(N

-LC)螺距的影响及其在干燥状态下所制得薄膜的光学性能。研究结果表明

溶致N

-LC的螺距随着超声功率的增大而增大

其干燥薄膜的反射波波长红移

且红移幅度与超声功率有关。但是

CNC的晶型和尺寸没有明显变化。电导率测试结果表明

超声处理使溶致N

-LC的电导率提高。由此推测溶致N

-LC的螺距增大的主要原因是大功率超声处理使束缚在双电层中的带电离子释放出来

进而CNC粒子之间的静电斥力变大所致。

Abstract

The ultrasonic effect on the lyotropic chiral nematic liquid crystal(N

-LC) of cellulose nanocrystal(CNC) and optical properties of the solid N

-LC film were investigated by using polarized light microscopy(POM)

UV-visible spectroscopy(UV-vis)

X-ray diffraction(XRD) analysis

and electric conductivity

etc. It is found that the pitch of the N

-LC was stretched with the increase of the ultrasonic power. The reflection wave length of the N

-LC solid film was red-shifted with the increase of the ultrasonic power. The amplitude of the red-shift of reflection wave length depended on the applied ultrasonic power. The conductivity of the lyotropic N

-LC increased after ultrasound treatment. As a consequence

it is speculated that the high power ultrasonic treatment releases some of the ions trapped in the bounded electric double layer on the surface of CNC particles

which make the electrostatic repulsion between CNC increasing. So the increase in the repulsion force resulted in a larger pitch and a red-shift of the iridescence wavelength of the resulting solid film.

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Keywords

references

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Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China, E-mail:yanghuai@mater.ustb.edu.

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