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Multiresponsive Cylindrically Symmetric Cholesteric Liquid Crystal Elastomer Fibers Templated by Tubular Confinement
Advanced Science ( IF 14.3 ) Pub Date : 2023-04-26 , DOI: 10.1002/advs.202301414 Yong Geng 1 , Jan P F Lagerwall 1
Advanced Science ( IF 14.3 ) Pub Date : 2023-04-26 , DOI: 10.1002/advs.202301414 Yong Geng 1 , Jan P F Lagerwall 1
Affiliation
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Cylindrically symmetric cholesteric liquid crystal elastomer (CLCE) fibers templated by tubular confinement are reported, displaying mechanochromic, thermochromic, and thermomechanical responses. The synthesis inside a sacrificial tube secures radial orientation of the cholesteric helix, and the ground state retroreflection wavelength is easily tuned throughout the visible spectrum or into the near-infrared by varying the concentration of a chiral dopant. The fibers display continuous, repeatable, and quantitatively predictable mechanochromic response, reaching a blue shift of more than −220 nm for 180% elongation. The cylindrical symmetry renders the response identical in all directions perpendicular to the fiber axis, making them exceptionally useful for monitoring complex strains, as demonstrated in revealing local strain during tying of different knots. The CLCE reflection color can be revealed with high contrast against any background by taking advantage of the circularly polarized reflection. Upon heating, the fibers respond—fully reversibly—with red shift and radial expansion/axial contraction. However, there is no transition to an isotropic state, confirming a largely forgotten theoretical prediction by de Gennes. These fibers and the easy way of making them may open new windows for large-scale application in advanced wearable technology and beyond.
中文翻译：
管状约束模板的多响应圆柱对称胆甾型液晶弹性体纤维
据报道，以管状限制为模板的圆柱对称胆甾型液晶弹性体（CLCE）纤维，表现出机械致变色、热致变色和热机械响应。牺牲管内的合成确保了胆甾醇螺旋的径向取向，并且通过改变手性掺杂剂的浓度，可以轻松地将基态回射波长调谐到整个可见光谱或近红外范围。纤维表现出连续、可重复且可定量预测的力致变色响应，在 180% 伸长率下蓝移达到超过 -220 nm。圆柱对称性使得垂直于纤维轴的所有方向上的响应都相同，这使得它们对于监测复杂应变特别有用，正如在揭示不同结的打结过程中的局部应变中所证明的那样。利用圆偏振反射，可以在任何背景下以高对比度显示 CLCE 反射颜色。加热后，纤维会完全可逆地响应红移和径向膨胀/轴向收缩。然而，并没有转变为各向同性状态，这证实了德热尼斯的一个基本上被遗忘的理论预测。这些纤维及其简单的制造方法可能为先进可穿戴技术及其他领域的大规模应用打开新的窗口。
更新日期：2023-04-26
中文翻译：
管状约束模板的多响应圆柱对称胆甾型液晶弹性体纤维
据报道，以管状限制为模板的圆柱对称胆甾型液晶弹性体（CLCE）纤维，表现出机械致变色、热致变色和热机械响应。牺牲管内的合成确保了胆甾醇螺旋的径向取向，并且通过改变手性掺杂剂的浓度，可以轻松地将基态回射波长调谐到整个可见光谱或近红外范围。纤维表现出连续、可重复且可定量预测的力致变色响应，在 180% 伸长率下蓝移达到超过 -220 nm。圆柱对称性使得垂直于纤维轴的所有方向上的响应都相同，这使得它们对于监测复杂应变特别有用，正如在揭示不同结的打结过程中的局部应变中所证明的那样。利用圆偏振反射，可以在任何背景下以高对比度显示 CLCE 反射颜色。加热后，纤维会完全可逆地响应红移和径向膨胀/轴向收缩。然而，并没有转变为各向同性状态，这证实了德热尼斯的一个基本上被遗忘的理论预测。这些纤维及其简单的制造方法可能为先进可穿戴技术及其他领域的大规模应用打开新的窗口。
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