Hygroscopic motions of fossil conifer cones

Poppinga, Simon; Nestle, Nikolaus; Šandor, Andrea; Reible, Bruno; Masselter, Tom; Bruchmann, Bernd; Speck, Thomas

doi:10.1038/srep40302

Cited by 40 publications

(28 citation statements)

References 17 publications

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“…Scale cellulose fibrils are asymmetrically oriented, and this layout is responsible for the translation of local swelling/shrinking to a global bending movement . Recently, it was discovered that hygroscopic motion is still possible in coalified conifer cones from the Eemian Interglacial period (≈126 000–113 000 years ago) and from the Middle Miocene period (≈16.5–11.5 million years ago) . Hygroscopic movement is also ubiquitous in plants that rely on spore dispersion, i.e., the spores deform as they dry, causing the sporangia to open and release its spores .…”

Section: Cellulose‐based Films That Mimic the Movements Of Hydro‐respmentioning

confidence: 99%

Cellulose‐Based Biomimetics and Their Applications

et al. 2018

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Nature has been producing cellulose since long before man walked the surface of the earth. Millions of years of natural design and testing have resulted in cellulose-based structures that are an inspiration for the production of synthetic materials based on cellulose with properties that can mimic natural designs, functions, and properties. Here, five sections describe cellulose-based materials with characteristics that are inspired by gratings that exist on the petals of the plants, structurally colored materials, helical filaments produced by plants, water-responsive materials in plants, and environmental stimuli-responsive tissues found in insects and plants. The synthetic cellulose-based materials described herein are in the form of fibers and films. Fascinating multifunctional materials are prepared from cellulose-based liquid crystals and from composite cellulosic materials that combine functionality with structural performance. Future and recent applications are outlined.

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Section: Cellulose‐based Films That Mimic the Movements Of Hydro‐respmentioning

confidence: 99%

Cellulose‐Based Biomimetics and Their Applications

et al. 2018

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“…In plants, this is a widespread phenomenon, being used for various forms of seed dispersal or predation . Interestingly, this property, which typically occurs in organic biological materials, was also found in naturally and artificially petrified pine cones, which retained the hierarchical structuring of the original material.…”

Section: Properties From Novel Structuresmentioning

confidence: 94%

“…There is a gray area with respect to the extent of transfer: Naturally mineralized biological tissue typically retains a portion of its organic components . Equally, artificially mineralized biological materials may keep their organic content fully, partially, in carbonized form or not at all.…”

Section: History Names and Nomenclaturementioning

confidence: 99%

A Perspective on Bio‐Mediated Material Structuring

et al. 2017

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Bioinspiration, biomorphy, biomimicry, biomimetics, bionics, and biotemplating are terms used to describe the fabrication of materials or, more generally, systems to solve technological problems by abstracting, emulating, using, or transferring structures from biological paradigms. Herein, a brief overview of how the different terminologies are being typically applied is provided. It is proposed that there is a rich field of research that can be expanded by utilizing various novel approaches for the guidance of living organisms for "bio-mediated" material structuring purposes. As examples of contact-based or contact-free guidance, such as substrate patterning, the application of light, magnetic fields, or chemical gradients, potentially interesting methods of creating hierarchically structured monolithic engineering materials, using live patterned biomass, biofilms, or extracellular substances as scaffolds, are presented. The potential advantages of such materials are discussed, and examples of live self-patterning of materials are given.

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“…The motile plant structures (leaves, cone scales, petals, capsules, etc.) represent natural compliant mechanisms without localized hinges and joints and are often characterized by high durability and functional resilience and robustness, which makes them ideal candidates for such biomimetic approaches …”

Section: Introductionmentioning

confidence: 99%

Toward a New Generation of Smart Biomimetic Actuators for Architecture

Zollfrank²,

et al. 2017

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Motile plant structures (e.g., leaves, petals, cone scales, and capsules) are functionally highly robust and resilient concept generators for the development of biomimetic actuators for architecture. Here, a concise review of the state-of-the-art of plant movement principles and derived biomimetic devices is provided. Achieving complex and higher-dimensional shape changes and passive-hydraulic actuation at a considerable time scale, as well as mechanical robustness of the motile technical structures, is challenging. For example, almost all currently available bioinspired hydraulic actuators show similar limitations due to the poroelastic time scale. Therefore, a major challenge is increasing the system size to the meter range, with actuation times of minutes or below. This means that response speed and flow rate need significant improvement for the systems, and the long-term performance degradation issue of hygroscopic materials needs to be addressed. A theoretical concept for "escaping" the poroelastic regime is proposed, and the possibilities for enhancing the mechanical properties of passive-hydraulic bilayer actuators are discussed. Furthermore, the promising aspects for further studies to implement tropistic movement behavior are presented, i.e., movement that depends on the direction of the triggering stimulus, which can finally lead to "smart building skins" that autonomously and self-sufficiently react to changing environmental stimuli in a direction-dependent manner.

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Hygroscopic motions of fossil conifer cones

Cited by 40 publications

References 17 publications

Cellulose‐Based Biomimetics and Their Applications

Cellulose‐Based Biomimetics and Their Applications

A Perspective on Bio‐Mediated Material Structuring

Toward a New Generation of Smart Biomimetic Actuators for Architecture

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