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Cuttlebone-inspired Structures for Mechanical Damping

Part of:
- Poster The versatile usage of wrinkled surfaces 1 Dr. Bernhard Alexander Glatz
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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
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- Poster Growing bone-like tissues on negative Gaussian curvature surfaces 1 Prof. Dr. John Dunlop
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- Poster Plant Biomimetics: Surface-Structured Pollen Particles and Transparent Flower Petals 1 Prof. Dr. Olaf Karthaus
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- Poster Seeded Mineralization Leads to Prismatic-Type CaCO3 Thin Coatings with Multiple Structural Functions 0 Ming Li
- Poster Multifunctional Layered Magnetic Composites 1 Christian Debus
- Poster Cuttlebone-inspired Structures for Mechanical Damping 1 Dipl.-Ing. Andrea Knöller

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

Ceramics typically feature excellent thermal, chemical and mechanical stability, making them widely applicable in today's technologies. However, the hard and stiff nature of ceramics makes them prone to brittle fracturing, when being exposed to mechanical shock or vibrations. Such mechanical failure then negatively affects the lifetime of the ceramics' technical applications. One well-established approach to enhance the fracture toughness of ceramics is to combine them with a soft and ductile component, which serves as shock absorber. Even though the mechanical performance is drastically improved in this way, the presence of a second component could shield the functionality of the ceramics, reducing their technical performance.

Here we report an alternative concept to generate a vibration resistant functional all-ceramic material, using V2O5 scaffolds as model system. Hydrated V2O5 nanofibers were synthesised by a well-established sol-gel method. Owing to their nanosize and high aspect ratio the synthesized V2O5 building blocks exhibit a pronounced mechanical flexibility – a property, which is unusual for ceramics. This flexibility could be transferred to the macroscopic level by their filigree assembly, using ice-templating of aqueous nanofiber solutions. Subsequent freeze drying yielded highly porous (up to 99.8 %) scaffolds, which mimic the structure of natural cuttlebone. Finally, annealing the scaffolds at 350 °C removed the residual water, but simultaneously preserves the identity of the nanofibers, thus preserved the filigree microstructure. The resulting scaffolds featured a macroscopic elastic deformation of 3 %, which is exceptional among other all-ceramic materials. Moreover, this elasticity enabled the investigation of the scaffolds’ dynamic mechanical performance. Compression- and frequency dependent damping tests revealed ultrahigh damping capacities with a loss factor tanδ of up to 0.47, which outperforms conventional polyurethane foams (tanδ ~ 0.14) by up to 300 %.

This concept could be transferred to other fiber-shaped ceramic nanomaterials, enabling to generate numerous shock and vibration resistant functional materials for various applications, including catalysis, sensing and energy storage.

1. Knöller, A., Runčevski, T., Dinnebier, R. E., Bill, J. & Burghard, Z. Cuttlebone-like V2O5 Nanofibre Scaffolds – Advances in Structuring Cellular Solids. Sci. Rep. 7, 42951 (2017).


Dipl.-Ing. Andrea Knöller
University of Stuttgart
Additional Authors:
  • Stefan Kilper
    University of Stuttgart
  • Achim M. Diem
    University of Stuttgart
  • Dr. Zaklina Burghard
    University of Stuttgart
  • Prof. Dr. Joachim Bill
    University of Stuttgart

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