Spray-Coated Halloysite-Epoxy Composites: A Means to Create Mechanically Robust, Vertically Aligned Nanotube Composites

Kenan Song, Roberta Polak, Dayong Chen, Michael F. Rubner, Robert E. Cohen, Khalid A. Askar

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

Halloysite nanotube-filled epoxy composites were fabricated using spray-coating methods. The halloysite nanotubes (HNTs) were aligned by the hydrodynamic flow conditions at the spray nozzle, and the polymer viscosity helped to preserve this preferential orientation in the final coatings on the target substrates. Electron microscopy demonstrated a consistent trend of higher orientation degree in the nanocomposite coatings as viscosity increased. The nanoindentation mechanical performances of these coatings were studied using a Hysitron TriboIndenter device. Composites showed improvements up to ∼50% in modulus and ∼100% in hardness as compared to pure epoxy, and the largest improvements in mechanical performance correlated with higher alignment of HNTs along the plane-normal direction. Achieving this nanotube alignment using a simple spray-coating method suggests potential for large-scale production of multifunctional anisotropic nanocomposite coatings on a variety of rigid and deformable substrates.

Original languageEnglish (US)
Pages (from-to)20396-20406
Number of pages11
JournalACS Applied Materials and Interfaces
Volume8
Issue number31
DOIs
StatePublished - Aug 10 2016

Keywords

  • alignment
  • halloysite
  • mechanical
  • orientation factor
  • thin-film coating

ASJC Scopus subject areas

  • Materials Science(all)

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