• CN:11-2187/TH
  • ISSN:0577-6686

›› 2012, Vol. 48 ›› Issue (16): 122-129.

• 论文 • 上一篇    下一篇

基于液晶引流效应的全新微流体驱动方式

刘春波;田勇;辻知宏;蝶野成臣   

  1. 河南工业大学机电工程学院;高知工科大学智能机械系
  • 发布日期:2012-08-20

New Microfludic Driving Method Based on Liquid Crystalline Backflow Effect

LIU Chunbo;TIAN Yong;TSUJI Tomohiro;CHONO Shigeomi   

  1. College of Mechanical and Electrical Engineering, Henan University of Technology Department of Mechanical Engineering, Kochi University of Technology
  • Published:2012-08-20

摘要: 对现有微流体驱动技术中普遍存在的微型化难、驱动力小等缺点,提出液晶引流驱动方式。作为开发该驱动方式的第一步,采用理论计算模拟与辅助试验验证相结合的研究方法,以小分子液晶Leslie-Ericksen理论为基础,对上板处于浮动状态下液晶盒的驱动效果及影响因素进行研究。结果表明,连续方波电场作用下引起的液晶引流效应可以驱动液晶盒上板运动,方波电场频率为1 Hz、有效率为5%时驱动速度最大。液晶分子指向矢倾斜角的旋转范围对驱动效果影响较大,所施加电压对于倾斜角的旋转范围没明显影响,两板间的距离却影响很大。通过选择合适的驱动条件已成功得到90 μm/s的高驱动速度。采用显微镜下直接观察液晶盒上板运动情况的方法进行试验验证,结果与理论计算结果定性上十分吻合,定量上试验结果偏小,最大差距出现在电场施加后的第三周期,主要原因是液晶盒制作时初始配向误差,可通过改变配向膜的种类及摩擦条件来改善。

关键词: Leslie-Ericksen理论, 微流体驱动, 引流效应

Abstract: For the shortcomings in the existing micro-fluidics drive and control technology such as miniaturization, small driving force, etc. A new method to drive and control the micro fluidics through liquid crystalline backflow effect is proposed. As the first step, the theoretical simulation and experimental study on the driving effect of the cell and the influence factors is done using Leslie-Ericksen theory. With the imposition of continuous square wave electric field, the upper plate of the liquid crystalline cell can be driven to move with oscillation. When the electric field frequency is 1 Hz with 5% ratio, the maximum velocity can be achieved. The applied voltage of the electric field has no much influence on the driven effect. The most important factor is the rotate range of the director. A driving speed of more than 90 μm/s is achieved successfully. Direct observation method using microscope is used in the experimental study, the calculation results are in good agreement with the experimental results qualitatively. Quantitative error is mainly caused by the initial alignment error of the liquid crystalline cell and can be improve by changing the alignment membrane or friction conditions.

Key words: Backflow effect, Leslie-Ericksen theory, Micro-fluidic driving

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