Hydrodynamic Elastocapillary Morphing of Hair Bundles
Hydrodynamic Elastocapillary Morphing of Hair Bundles
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DOI：
10.1103/physrevlett.125.254503
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发表时间：
2020-12-16
影响因子：
8.6
通讯作者：
Tawficke, Sameh
中科院分区：
文献类型：
--
作者：
Ha, Jonghyun;Kim, Yun Seong;Tawficke, Sameh
我们报告了由毛细作用、流体动力学和弹性驱动的排列成空心束的头发的多态自组装。从液体浴中出现的束会收缩，但由于被困在毛发之间的半月板的负压，在缓慢排水时仍保持中空。时间尺度允许纤维集体硬化以抵抗闭合。在快速排水时，在液体通过头发排出之前，发束完全闭合。困在孔中的液柱封闭了纤维束，而润滑的毛发仍然表现柔软。缩放定律预测了这种可逆的毛发多态性。
We report polymorphic self-assembly of hair arranged in hollow bundles driven by capillarity, hydrodynamics, and elasticity. Bundles emerging from a liquid bath shrink but remain hollow at slow drainage due to the negative pressure of the menisci trapped between the hairs. The timescale allows the collective stiffening of the fibers to resist closure. At fast drainage, the bundles fully close before the liquid can drain through the hair. A liquid column trapped in the hole closes the bundle while the lubricated hairs still behave softly. Scaling laws predict this reversible hair polymorphism.