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Morphing in nature and beyond: a review of natural and synthetic shape-changing materials and mechanisms

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)10663–10689
Number of pages27
JournalJournal of Materials Science
Volume51
Issue number24
Early online date19 Aug 2016
DOIs
DateAccepted/In press - 10 Aug 2016
DateE-pub ahead of print - 19 Aug 2016
DatePublished (current) - Dec 2016

Abstract

Shape-changing materials open an entirely new solution space for a wide range of disciplines: from architecture that responds to the environment and medical devices that unpack inside the body, to passive sensors and novel robotic actuators. While synthetic shape-changing materials are still in their infancy, studies of biological morphing materials have revealed key paradigms and features which underlie efficient natural shape-change. Here, we review some of these insights and how they have been, or may be, translated to artificial solutions. We focus on soft matter due to its prevalence in nature, compatibility with users and potential for novel design. Initially, we review examples of natural shape-changing materials—skeletal muscle, tendons and plant tissues—and compare with synthetic examples with similar methods of operation. Stimuli to motion are outlined in general principle, with examples of their use and potential in manufactured systems. Anisotropy is identified as a crucial element in directing shape-change to fulfil designed tasks, and some manufacturing routes to its achievement are highlighted. We conclude with potential directions for future work, including the simultaneous development of materials and manufacturing techniques and the hierarchical combination of effects at multiple length scales.

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    Rights statement: This is the final published version of the article (version of record). It first appeared online via Springer Verlag at http://dx.doi.org/10.1007/s10853-016-0295-8. Please refer to any applicable terms of use of the publisher.

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