Origami-like unfolding of hydro-actuated ice plant seed capsules
Origami-like unfolding of hydro-actuated ice plant seed capsules
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DOI：
10.1038/ncomms1336
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发表时间：
2011-06-01
影响因子：
16.6
通讯作者：
Burgert, Ingo
中科院分区：
文献类型：
--
作者：
Harrington, Matthew J.;Razghandi, Khashayar;Burgert, Ingo
受激励的植物材料是设计对特定外界刺激作出反应的适应性材料和结构的灵感来源。与水力反应、新陈代谢无关的植物运动尤其令人着迷，因为提取的概念比那些依赖细胞活动的概念更容易转移到工程中。在这里，我们研究了一种复杂的植物运动机制的结构和成分基础--依赖于水合的冰植物种子壳的展开。这种可逆的折纸状折叠模式通过一个协同的弯曲和包装机制进行，该机制由填充特殊植物细胞的可膨胀纤维素层驱动。通过嵌入在冰厂阀门的分层结构中的简单几何约束，膨胀被转化为器官的双向运动。从这种可靠和可逆的驱动运动中提取的原理与新兴的“可编程物质”领域相关，应用范围广泛，如卫星和人造肌肉的设计。
Actuated plant materials are a source of inspiration for the design of adaptive materials and structures that are responsive to specific external stimuli. Hydro-responsive, metabolism-independent plant movements are particularly fascinating, because the extracted concepts are more amenable to transfer into engineering than those dependent on cellular activity. Here we investigate the structural and compositional basis of a sophisticated plant movement mechanism-the hydration-dependent unfolding of ice plant seed capsules. This reversible origami-like folding pattern proceeds via a cooperative flexing-and-packing mechanism actuated by a swellable cellulose layer filling specialized plant cells. Swelling is translated into a bidirectional organ movement through simple geometric constraints embedded in the hierarchical architecture of the ice plant valves. Extracted principles from this reliable and reversible actuated movement have relevance to the emerging field of 'programmable matter' with applications as far-reaching as the design of satellites and artificial muscles.