Tunable Wood by Reversible Interlocking and Bioinspired Mechanical Gradients

Marion Frey, Giulia Biffi, Maria Adobes-Vidal, Meri Zirkelbach, Yaru Wang, Kunkun Tu, Ann M. Hirt, Kunal Masania, Ingo Burgert, Tobias Keplinger

Research output: Contribution to journalArticleScientificpeer-review

19 Citations (Scopus)

Abstract

Elegant design principles in biological materials such as stiffness gradients or sophisticated interfaces provide ingenious solutions for an efficient improvement of their mechanical properties. When materials such as wood are directly used in high-performance applications, it is not possible to entirely profit from these optimizations because stiffness alterations and fiber alignment of the natural material are not designed for the desired application. In this work, wood is turned into a versatile engineering material by incorporating mechanical gradients and by locally adapting the fiber alignment, using a shaping mechanism enabled by reversible interlocks between wood cells. Delignification of the renewable resource wood, a subsequent topographic stacking of the cellulosic scaffolds, and a final densification allow fabrication of desired 3D shapes with tunable fiber architecture. Additionally, prior functionalization of the cellulose scaffolds allows for obtaining tunable functionality combined with mechanical gradients. Locally controllable elastic moduli between 5 and 35 GPa are obtained, inspired by the ability of trees to tailor their macro- and micro-structure. The versatility of this approach has significant relevance in the emerging field of high-performance materials from renewable resources.

Original languageEnglish
Article number1802190
Number of pages8
JournalAdvanced Science
Volume6
Issue number10
DOIs
Publication statusPublished - 17 May 2019
Externally publishedYes

Keywords

  • delignification
  • mechanical gradients
  • natural fiber composites
  • reversible mechanical interlocking
  • shapeable wood

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