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Bio-Inspired Interlocking Structures for Enhancing Flexible Coatings Adhesion.

Pengpeng LuXin LiJingyang XuYong FanJiyu SunYunhong LiangLimei TianWeihua MingLuquan RenJie Zhao
Published in: Small (Weinheim an der Bergstrasse, Germany) (2024)
The flexible protective coatings and substrates frequently exhibit unstable bonding in industrial applications. For strong interfacial adhesion of heterogeneous materials and long-lasting adhesion of flexible protective coatings even in harsh corrosive environments. Inspired by the interdigitated structures in Phloeodes diabolicus elytra, a straightforward magnetic molding technique is employed to create an interlocking microarray for reinforced heterogeneous assembly. Benefiting from this bio-inspired microarrays, the interlocking polydimethylsiloxane (PDMS) coating recorded a 270% improvement in tensile adhesion and a 520% increase in shear resistance, approaching the tensile limitation of PDMS. The elastic polyurethane-polyamide (PUPI) coating equipped with interlocking structures demonstrated a robust adhesion strength exceeding 10.8 MPa and is nearly unaffected by the corrosion immersion. In sharp contrast, its unmodified counterpart exhibited low initial adhesion and maintain ≈20% of its adhesion strength after 30 d of immersion. PUPI coating integrated with microarrays exhibits superior resistance to corrosion (30 d, |Z| 0.01HZ ≈10 10  Ω cm 2 , R ct ≈10 8  Ω cm 2 ), cavitation and long-term adhesion retention. These interlocking designs can also be adapted to curved surfaces by 3D printing and enhances heterogeneous assembly of non-bonded materials like polyvinylidene fluoride (PTFE) and PDMS. This bio-inspired interlocking structures offers a solution for durably bonding incompatible interfaces across varied engineering applications.
Keyphrases
  • biofilm formation
  • cell migration
  • high resolution
  • magnetic resonance
  • candida albicans
  • staphylococcus aureus
  • risk assessment
  • molecular dynamics simulations
  • molecularly imprinted