Spray-Coated Halloysite-Epoxy Composites: A Means To Create Mechanically Robust, Vertically Aligned Nanotube Composites
| Autor: | Kenan Song, Roberta Polak, Dayong Chen, Michael F. Rubner, Khalid Askar, Robert E. Cohen |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Nanotube Materials science Nanocomposite Modulus 02 engineering and technology Polymer Epoxy Nanoindentation engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Halloysite 0104 chemical sciences Spray nozzle chemistry visual_art visual_art.visual_art_medium engineering General Materials Science Composite material 0210 nano-technology |
| Zdroj: | ACS applied materialsinterfaces. 8(31) |
| ISSN: | 1944-8252 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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