Hygromorphs: from pine cones to biomimetic bilayers
Hygromorphs: from pine cones to biomimetic bilayers
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DOI：
10.1098/rsif.2009.0184
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发表时间：
2009-10-06
影响因子：
3.9
通讯作者：
Mahadevan, L.
中科院分区：
文献类型：
--
作者：
Reyssat, E.;Mahadevan, L.
我们考虑天然和人工的湿形态，通过改变它们的形状来响应环境湿度的物体。以松塔为例，干燥时打开，潮湿时关闭，我们在细胞，组织和器官水平上量化了关闭和打开的几何形状，力学和动力学，建立在我们先前的结构知识基础上。一个简单的标度理论使我们能够量化的滞后动力学的开放和关闭。我们还展示了如何简单的双层hygromorps的纸和聚合物表现出类似的行为，可以通过一个理论，耦合在多孔介质中的流体传输和蒸发通量的力学和几何量化。我们的工作统一了不同的观察自然hygromorphs，并提出有趣的仿生类似物，我们说明了使用一个可控的开花和关闭响应的人造花。
We consider natural and artificial hygromorphs, objects that respond to environmental humidity by changing their shape. Using the pine cone as an example that opens when dried and closes when wet, we quantify the geometry, mechanics and dynamics of closure and opening at the cell, tissue and organ levels, building on our prior structural knowledge. A simple scaling theory allows us to quantify the hysteretic dynamics of opening and closing. We also show how simple bilayer hygromorphs of paper and polymer show similar behaviour that can be quantified via a theory which couples fluid transport in a porous medium and evaporative flux to mechanics and geometry. Our work unifies varied observations of natural hygromorphs and suggests interesting biomimetic analogues, which we illustrate using an artificial flower with a controllable blooming and closing response.