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Open AccessArticle

Understanding the Antipathogenic Performance of Nanostructured and Conventional Copper Cold Spray Material Consolidations and Coated Surfaces

1
Materials Science and Engineering, Worcester Polytechnic Institute, Worcester, MA 01609, USA
2
Raytheon Technologies, Waltham, MA 02451, USA
*
Authors to whom correspondence should be addressed.
Crystals 2020, 10(6), 504; https://doi.org/10.3390/cryst10060504
Received: 1 May 2020 / Revised: 9 June 2020 / Accepted: 10 June 2020 / Published: 12 June 2020
The role of high strain rate and severe plastic deformation, microstructure, electrochemical behavior, surface chemistry and surface roughness were characterized for two copper cold spray material consolidations, which were produced from conventionally gas-atomized copper powder as well as spray-dried copper feedstock, during the course of this work. The motivation underpinning this work centers upon the development of a more robust understanding of the microstructural features and properties of the conventional copper and nanostructured copper coatings as they relate to antipathogenic contact killing and inactivation applications. Prior work has demonstrated greater antipathogenic efficacy with respect to the nanostructured coating versus the conventional coating. Thus, microstructural analysis was performed in order to establish differences between the two coatings that their respective pathogen kill rates could be attributed to. Results from advanced laser-induced projectile impact testing, X-ray diffraction, scanning electron microscopy, electron backscatter diffraction, scanning transmission microscopy, nanoindentation, energy-dispersive X-ray spectroscopy, nanoindentation, confocal microscopy, atomic force microscopy, linear polarization, X-ray photoelectron spectroscopy, electrochemical impedance spectroscopy and copper ion release assaying were performed during the course of this research. View Full-Text
Keywords: cold spray; antipathogenic surfaces; grain refinement; powder metallurgy; copper contact killing/inactivation; nanostructured crystalline materials; ultra-fine grains; dislocations; grain boundary diffusion cold spray; antipathogenic surfaces; grain refinement; powder metallurgy; copper contact killing/inactivation; nanostructured crystalline materials; ultra-fine grains; dislocations; grain boundary diffusion
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Sousa, B.C.; Sundberg, K.L.; Gleason, M.A.; Cote, D.L. Understanding the Antipathogenic Performance of Nanostructured and Conventional Copper Cold Spray Material Consolidations and Coated Surfaces. Crystals 2020, 10, 504.

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