How to mimic the shapes of plant tendrils on the nano and microscale: spirals and helices of electrospun liquid crystalline cellulose derivatives
How to mimic the shapes of plant tendrils on the nano and microscale: spirals and helices of electrospun liquid crystalline cellulose derivatives
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DOI：
10.1039/b821631b
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发表时间：
2009-01-01
期刊：
影响因子：
3.4
通讯作者：
Teixeira, P. I. C.
中科院分区：
文献类型：
--
作者：
Godinho, M. H.;Canejo, J. P.;Teixeira, P. I. C.
我们表明，悬浮的纳米和微米纤维电纺从液晶纤维素溶液将卷曲成螺旋，如果他们支持在一端，或者，如果他们支持在两端，将扭曲成一个螺旋的一个手性超过一半的长度和相反的手性超过另一半，这两个半被连接由一个短的直线部分。后一种现象，称为反常，是纤维的内曲率和拓扑守恒定律的结果。此外，只有考虑到纤维的固有扭转，理论和实验才能一致。已知攀援植物如西番莲（Passiflora edulis）的卷须表现出完全相同的行为，尽管长度尺度为毫米，即，比我们的纤维大三到四个数量级。这表明，相同的基本，粗粒度的物理模型适用于整个长度范围。
We show that suspended nano and microfibres electrospun from liquid crystalline cellulosic solutions will curl into spirals if they are supported at just one end, or, if they are supported at both ends, will twist into a helix of one handedness over half of its length and of the opposite handedness over the other half, the two halves being connected by a short straight section. This latter phenomenon, known as perversion, is a consequence of the intrinsic curvature of the fibres and of a topological conservation law. Furthermore, agreement between theory and experiment can only be achieved if account is taken of the intrinsic torsion of the fibres. Precisely the same behaviour is known to be exhibited by the tendrils of climbing plants such as Passiflora edulis, albeit on a lengthscale of millimetres, i.e., three to four orders of magnitude larger than in our fibres. This suggests that the same basic, coarse-grained physical model is applicable across a range of lengthscales.