AccScience Publishing / MSAM / Volume 3 / Issue 4 / DOI: 10.36922/msam.4970
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ORIGINAL RESEARCH ARTICLE

Anti-microbial plastic parts fabricated by high-speed sintering

Saleh Alkarri1* ,  Zahir Bashir2 ,  Marco Wimmer3,4 ,  Johann Schorzmanm3 ,  Frank Döpper3,4
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1 School of Packaging, Michigan State University, East Lansing, Michigan, United States of America
2 Catenated Carbon Consultancy Ltd., Birmingham, England
3 Chair of Manufacturing and Remanufacturing Technologies, Faculty of Engineering, University of Bayreuth, Bayreuth, Germany
4 Fraunhofer Institute for Manufacturing Engineering and Automation IPA, Bayreuth, Germany
MSAM 2024, 3(4), 4970 https://doi.org/10.36922/msam.4970
Submitted: 27 September 2024 | Accepted: 23 October 2024 | Published: 3 December 2024
© 2024 by the Author(s). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ )
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Abstract

 This study utilizes Mg(OH)2 nanocrystals (a non-leaching biocide) to develop plastic articles with anti-microbial activity. The standard method for manufacturing plastic nanocomposites involves melt compounding Mg(OH)2 nanocrystals into a polymer melt, followed by injection molding; however, this approach did not produce a part with anti-microbial activity because there were no Mg(OH)2 nanocrystals on the surface of the parts. Anti-microbial polyamide 12 (PA 12) parts could be produced using a specific 3D printing method called high-speed sintering (HSS). The HSS-printed parts were subsequently dip-coated with an anti-microbial suspension of Mg(OH)2 nanoplatelets (NPs). The Mg(OH)2 NPs embedded on the surface of the HSS-printed part exhibited a log10 4 reduction (effective killing) of the bacterium Escherichia coli K-12 MG1655 (E. coli). The Mg(OH)2 NPs adhered well to the HSS-printed parts and could be used repeatedly with no loss of anti-microbial activity. In contrast, the dip-coated injection-molded PA 12 part was ineffective because the Mg(OH)2 NPs did not adhere to it. The surface of the HSS-printed part naturally allows the binding of the Mg(OH)2 nanocrystals. The anti-microbial activity of Mg(OH)2 NPs depends on direct contact between them and the microbe, which is feasible with the dip-coated HSS-printed part but not with the injection-molded nanocomposite. The work illustrates some of the unique possibilities arising from 3D printing.

Keywords
: Anti-microbial plastics
E. coli K-12 MG1655
Magnesium hydroxide
Non-leachable
Polyamide 12
High-speed sintering
Additive manufacturing
Funding
This research received no external funding
Conflict of interest
All authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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Materials Science in Additive Manufacturing, Electronic ISSN: 2810-9635 Published by AccScience Publishing
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