基于液晶弹性体的多刺激响应软材料及其应用研究

  机械致变色效应是材料的结构色受力的作用而变化，直观、便捷、高效的优点使其在软机械系统的形变检测中受到广泛研究，但当前仍面临检测精度较低、检测范围不足等方面的挑战。胆甾相液晶弹性体（Cholesteric Liquid Crystal Elastomer, CLCE）是一种柔性的一维光子晶体，具有明亮的结构颜色和优异的刺激响应能力，有望突破基于机械致变色效应的软光学传感器检测精度较低、形变检测范围不足的限制。

  本课题提出了一种光、磁双重响应的集成式CLCE器件，实现了更高精度、更大形变检测范围的光学传感。通过在LCE中掺入硬磁性颗粒钕铁硼NdFeB，结合剪纸技术，基于光诱导相变和结构化磁化，本课题实现了光、磁场驱动的LCE致动器；下一步通过各向异性消溶胀法制备了红、绿、蓝三种颜色的CLCE薄膜；集成CLCE薄膜与光、磁双重响应LCE，本课题建立了磁场作用下器件的弯曲角度（0-120°）与产生的结构色（400-700 nm）之间的映射关系，实现了能够检测基于弯曲形变的柔性结构色传感器件，具有0.468 nm/°（绿色CLCE）的检测精度。

  与目前基于机械致变色效应的检测方法相比，本课题提出的方法具有制备工艺简单、更高的检测精度、更大的形变检测范围的优势。希望这种具有光、磁双重响应能力的集成式多功能CLCE器件能够为多功能智能系统的应用和发展提供新的技术思路。

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