Selective Bragg reflection of visible light from coaxial electrospun fiber mats
Selective Bragg reflection of visible light from coaxial electrospun fiber mats
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DOI：
10.1002/app.49647
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发表时间：
2021-01
影响因子：
3
通讯作者：
U. Singh;Saeed D. Mohan;F. Davis
中科院分区：
文献类型：
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作者：
U. Singh;Saeed D. Mohan;F. Davis
电纺是一种相对简单的技术，可以产生直径接近纳米级的连续纤维。在同轴电纺中，两种不同的液体可以纺丝，一种在另一种内部，以产生具有芯-鞘结构的复合纤维。我们制备了由聚乙烯吡咯烷酮护套和短间距手性向列相混合物CB15：E9芯组成的双芯纤维。在生产纤维之前，对流量、聚合物浓度和施加电压进行了优化。纤维被沉积成均匀的无纺布垫子，显示出来自受限手性液晶蓝相的可见光的选择性反射。这些反射既与温度有关，又是可逆的，这样的垫子提供了作为柔性传感器的潜力。
Electrospinning is a relatively unsophisticated technique for generating continuous fibers whose diameters can approach nanoscale dimensions. In coaxial electrospinning, two different liquids can be spun, one inside the other, to produce a composite fiber with a core‐sheath structure. We prepared dual‐core fibers consisting of poly vinyl‐pyrrolidone sheaths and cores of the short‐pitched chiral nematic mixture CB15:E9. The flow rates, polymer concentration, and applied voltage were optimized prior to fiber production. The fibers were deposited as uniform nonwoven mats that displayed selective reflection of visible light from the blue phase of the confined chiral liquid crystal. These reflections are both temperature dependent and reversible and such mats offer potential as flexible sensors.