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Nacre-like materials using a simple doctor blading technique: Fabrication, testing and modeling.

M Mirkhalaf1, F Barthelat1

  • 1Department of Mechanical Engineering, McGill University, 817 Sherbrooke Street West, Montreal, Quebec, Canada H3A 2K6.

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Summary

Researchers created nacre-like composites using doctor-blading, mimicking natural materials. Optimal mechanical properties were achieved at 15vol% alumina tablets, with higher concentrations degrading performance due to misalignment.

Keywords:
Artificial nacreBio-inspired materialsFinite element modelingOptimizationStaggered composites

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Area of Science:

  • Materials Science
  • Biomimetics
  • Composite Materials

Background:

  • Biological materials like nacre exhibit superior mechanical properties due to their staggered microstructures.
  • Mimicking these natural structures in engineering composites offers a pathway to enhanced material performance.
  • Understanding structure-property relationships is crucial for designing high-performance bio-inspired materials.

Purpose of the Study:

  • To fabricate staggered composites of alumina tablets in a chitosan matrix using doctor-blading.
  • To investigate the effect of alumina tablet concentration on the mechanical properties of these nacre-like composites.
  • To elucidate the role of microstructure, specifically tablet alignment and dispersion, in determining material performance.

Main Methods:

  • Doctor-blading technique for fabricating staggered alumina/chitosan composites.
  • Tensile testing to evaluate mechanical properties (modulus, strength).
  • Scanning Electron Microscopy (SEM) for microstructural analysis.
  • Large-scale finite element modeling to simulate mechanical behavior.

Main Results:

  • Composite modulus and strength increased with alumina tablet content up to 15vol%.
  • Beyond 15vol%, mechanical properties degraded significantly.
  • Microstructural analysis revealed tablet misalignment and clustering at higher concentrations.
  • Finite element models confirmed that misalignment severely degrades mechanical performance.

Conclusions:

  • Doctor-blading is a viable method for creating nacre-like composites with aligned microstructures.
  • Optimal mechanical performance is achieved at a critical tablet concentration (15vol%), beyond which defects dominate.
  • Microstructural imperfections, particularly misalignment, are the primary cause of property degradation at high filler loadings.
  • This study provides quantitative insights into the design principles for bio-inspired composites.