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Poster

Sclerenchymatic tissue in Banksia follicles – The effect of moisture on dimensional and mechanical properties

Sunday (01.01.2040)
00:00 - 21:34
Part of:
Line-Up:
- Poster The versatile usage of wrinkled surfaces 1 Bernhard Alexander Glatz
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- Poster Radiation-based methods for surface modification of supramolecular peptide fibrils 0 Juhaina Bandak
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- Poster Tobacco mosaic virus disks, preparation of samples to investigate mineralization by low voltage electron microscopy 1 Dr. Sabine Eiben
- Poster Deformation of Liquid-Liquid Phase Boundary as Template for Novel Surface Structured Polymer Particles and Coatings 1 Helena vom Stein
- Poster Sclerenchymatic tissue in Banksia follicles – The effect of moisture on dimensional and mechanical properties 1 Friedrich Reppe
- Poster Reconstructing in-situ nanofibrillar orientation and mechanics in arthropod cuticle using X-ray diffraction modelling 1 Ph.D. Yanhong Wang
- Poster Structural origins of morphing in plant tissues 1 Prof. Dr. Hanoch Daniel Wagner
- Poster What is the effect of cell network topology on the poro-elastic properties of bone? 1 Alexander van Tol
- Poster The fibrillar-level mechanisms of mutability in echinoderm connective tissue analysed using in situ synchrotron small-angle X-ray scattering 1 Dr. Himadri Shikhar Gupta
- Poster Growing bone-like tissues on negative Gaussian curvature surfaces 1 Prof. Dr. John Dunlop
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- Poster Transfer of surface properties of wheat leaves to technical surfaces 1 Miriam Huth
- Poster Damping Behaviour of Bioinspired and Natural Fibre Composites 1 Wilhelm Woigk
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- Poster Investigating the multilayer fiber-reinforced structure of the wood cell using computer simulations and additive manufacturing 1 Laura Zorzetto
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- Poster Biomineralization of Materials made of Engineered Spider Silk Proteins 1 Vanessa Wicklein
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- Poster Controlled Modification on Wood via SI-ATRP 1 Marta Vidiella del Blanco
- Poster Plant Biomimetics: Surface-Structured Pollen Particles and Transparent Flower Petals 1 Prof. Dr. Olaf Karthaus
- Poster Coupling of polymers to tobacco mosaic virus: towards the production of amphiphilic virus tubes 1 Dr. Sabine Eiben
- Poster Mechanical stable sulfobetainc Hydrogels - A candidate for biomedical application 1 Ramona Bianca Jasmin Ihlenburg
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- Poster Seeded Mineralization Leads to Prismatic-Type CaCO3 Thin Coatings with Multiple Structural Functions 0 Ming Li
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- Poster Cuttlebone-inspired Structures for Mechanical Damping 1 Dipl.-Ing. Andrea Knöller

Session P.1: Poster discussion evening
Belongs to:
Session P: Poster Presentation


The seed capsules (follicles) of some Banksia species, a plant genus native to Australia, do not release their seeds immediately after maturation but remain closed for up to two decades before they open upon the heat of a bushfire. Their seeds are released subsequently into an environment favorable for germination. For seed protection and final release follicles must stay intact and functional – properties desirable to incorporate in various materials. However, follicle properties are only partly understood. Our investigations aim to determine structural, thermal, hygroscopic and mechanical properties of selected follicle tissues by WAXS, experiments on hygroscopicity and tensile tests. The data is essential for a fundamental understanding of both initial opening and seed release which occurs upon several wetting and drying cycles. The experiments revealed differences between pericarp sections. Within the endocarp cellulose fibrils are oriented rather along the longitudinal follicle axis, in the mesocarp their orientation is shifted by approx. 70°. Experiments on the hygroscopic behavior of longitudinal pericarp sections show increasing swelling from the follicle inside to the outside, even within the mesocarp. The tensile Young’s modulus of both dry and wet tested samples revealed large differences between endo- and mesocarp and also between the moisture-states. These values largely exceed those of other lignocellulosic materials. We hypothesize that a moisture-induced softening particularly of the endocarp promotes the complete opening of the capsule for seed release after a bushfire. The presented data describe large effects of humidity on tissue properties. It might be groundwork for bioinspired materials with regard to composite structures and durable functionality originating from Banksia’s natural reproduction mechanism.

Speaker:
Friedrich Reppe
Max Planck Institute of Colloids and Interfaces
Additional Authors:
  • Nils Horbelt
    Max Planck Institute of Colloids and Interfaces
  • Jessica Huss
    Max Planck Institute of Colloids and Interfaces
  • Prof. Dr. Peter Fratzl
    Max Planck Institute of Colloids and Interfaces
  • Dr. Michaela Eder
    Max Planck Institute of Colloids and Interfaces