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Antibacterial Property of Cold-Sprayed HA-Ag/PEEK Coating

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Abstract

The antibacterial behavior of HA-Ag (silver-doped hydroxyapatite) nanopowder and their composite coatings were investigated against Escherichia coli (DH5α). HA-Ag nanopowder and PEEK (poly-ether-ether-ketone)-based HA-Ag composite powders were synthesized using in-house powder processing techniques. Bacteria culture assay of HA-Ag nanopowder and their composite powders displayed excellent bacteriostatic activity against E. coli. The antibacterial activity increased with increasing concentration of HA-Ag nanoparticle in these composite powders. These nanocomposite powders were subsequently used as feedstock to generate antibacterial coatings via cold spray technology. The ratios of HA-Ag to PEEK in their composite powders were 80:20, 60:40, 40:60, and 20:80 (wt.%). Microstructural characterization and phase analysis of feedstock powders and as-deposited coatings were carried out using FESEM/EDX and XRD. Antibacterial nanocomposite HA-Ag/PEEK coatings were successfully deposited using cold spraying parameters of 11-12 bars at preheated air temperature between 150 and 160 °C. These as-sprayed coatings of HA-Ag/PEEK composite powders comprising varying HA-Ag and PEEK ratios retained their inherent antibacterial property as verified from bacterial assay. The results indicated that the antibacterial activity increased with increasing HA-Ag nanopowder concentration in the composite powder feedstock and cold-sprayed coating.

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Acknowledgments

We wish to acknowledge the funding support for this project (RG1/04) from Nanyang Technological University, and the joint research collaboration with ST Kinetics (Singapore).

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Authors and Affiliations

  1. School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, Singapore

    Noppakun Sanpo, Meng Lu Tan, Philip Cheang & K.A. Khor

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  1. Noppakun Sanpo
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  2. Meng Lu Tan
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  3. Philip Cheang
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  4. K.A. Khor
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Correspondence to Noppakun Sanpo.

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Sanpo, N., Tan, M.L., Cheang, P. et al. Antibacterial Property of Cold-Sprayed HA-Ag/PEEK Coating. J Therm Spray Tech 18, 10–15 (2009). https://doi.org/10.1007/s11666-008-9283-0

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  • DOI: https://doi.org/10.1007/s11666-008-9283-0

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