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Hierarchical Silica Nanostructures Inspired by Diatom Algae Yield Superior Deformability, Toughness, and Strength

  • Symposium: Modeling, Simulation, and Theory of Nanomechanical Materials Behavior
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Abstract

A universal design paradigm in biology is the use of hierarchies, which is evident in the structure of proteins, cells, tissues, and organisms, as well as outside the material realm in the design of signaling networks in complex organs such as the brain. A fascinating example of a biological structure is that of diatoms, a microscopic mineralized algae that is mainly composed of amorphous silica, which features a hierarchical structure that ranges from the nano- to the macroscale. Here, we use the porous structure found at submicron length scales in diatom algae as a basis to study a bioinspired nanoporous material implemented in crystalline silica. We consider the mechanical performance of two nanoscale levels of hierarchy, studying an array of thin-walled foil silica structures and a hierarchical arrangement of foil elements into a porous silica mesh structure. By comparing their elastic, plastic, and failure mechanisms under tensile deformation, we elucidate the impact of hierarchies and the wall width of constituting silica foils on the mechanical properties, by carrying out a series of large-scale molecular dynamics (MD) simulations with the first principles based reactive force field ReaxFF. We find that by controlling the wall width and by increasing the level of hierarchy of the nanostructure from a foil to a mesh, it is possible to significantly enhance the mechanical response of the material, creating a highly deformable, strong, and extremely tough material that can be stretched in excess of 100 pct strain, in stark contrast to the characteristic brittle performance of bulk silica. We find that concurrent mechanisms of shearing and crack arrest lead to an enhanced toughness and are enabled through the hierarchical assembly of foil elements into a mesh structure, which could not be achieved in foil structures alone. Our results demonstrate that including higher levels of hierarchy are beneficial in improving the mechanical properties and deformability of intrinsically brittle materials. The findings reported here provide insight into general material design approaches that may enable us to transform a brittle material such as silicon or silica into a ductile, yet strong and tough material, solely through alterations of its structural arrangement at the nanoscale.

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Acknowledgments

We acknowledge support from the Army Research Office (Grant No. W9-11NNF-06-1029), the National Science Foundation through a Graduate Research Fellowship, the Gates Millennium Scholars Program, and a graduate research fellowship awarded by the Department of Civil and Environmental Engineering at the Massachusetts Institute of Technology.

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Authors and Affiliations

  1. Laboratory for Atomistic and Molecular Mechanics, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA

    Andre P. Garcia (Graduate Student), Dipanjan Sen (Graduate Student) & Markus J. Buehler (Associate Professor)

  2. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA

    Dipanjan Sen (Graduate Student)

Authors
  1. Andre P. Garcia
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  2. Dipanjan Sen
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  3. Markus J. Buehler
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Correspondence to Andre P. Garcia.

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Manuscript submitted March 19, 2010.

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Garcia, A.P., Sen, D. & Buehler, M.J. Hierarchical Silica Nanostructures Inspired by Diatom Algae Yield Superior Deformability, Toughness, and Strength. Metall Mater Trans A 42, 3889–3897 (2011). https://doi.org/10.1007/s11661-010-0477-y

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