Multifunctional stratified composite coatings by electrophoretic deposition and RF co-sputtering for orthopaedic implants

Nawaz Q, Fastner S, Rehman MAU, Ferraris S, Perero S, di Confiengo GG, Yavuz E, Ferraris M, Boccaccini AR (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Journal of Materials Science Springer Verlag (Germany)

DOI: 10.1007/s10853-020-05725-w

Abstract

In this study, multifunctional stratified antibacterial and bioactive coatings were deposited and characterised. Initially, PEEK/bioactive glass (BG)/ mesoporous bioactive glass nanoparticle (MBGN) layers with a thickness of 110–120 μm were deposited on stainless steel substrates using electrophoretic deposition (EPD). Thin silver nanocluster-silica composite layers with a thickness of 70–155 nm were then deposited by radio frequency (RF) co-sputtering on the previously deposited EPD coatings. The deposition was carried for two different sputtering times (20 min and 40 min), which led to different layer thicknesses. PEEK/BG/MBGNs coatings were also deposited via single-step EPD. A comparison between the physicomechanical and biological characteristics of single layer PEEK/BG/MBGNs composite coating and bilayer Ag-PEEK/BG/MBGNs is presented. Scanning electron microscopy (SEM) and energy-dispersive x-ray spectroscopy (EDX) indicated that silver nanoclusters were homogeneously distributed in the multilayered EPD/RF coatings. An apatite-like structure was formed on the surface of the coatings upon immersion in simulated body fluid (SBF) after 1 day. Silver nanoclusters embedded in the silica matrix as a top layer provided controlled release of silver ions which led to a potent antibacterial effect against E. coli and S. carnosus. Single layer coatings exhibited a burst release of Ag ions, which led to antibacterial effects but were toxic to osteoblast cells. Finally, the results of WST-8 assays confirmed that the multi-structured coatings allow osteoblast-like cells to proliferate and attach strongly on the surface of the coatings.

Authors with CRIS profile

Qaisar Nawaz Lehrstuhl für Werkstoffwissenschaften (Biomaterialien) Aldo Boccaccini Lehrstuhl für Werkstoffwissenschaften (Biomaterialien)

Involved external institutions

Politecnico di Torino IT Italy (IT) Akdeniz University TR Turkey (TR) Institute of Space Technology (IST) PK Pakistan (PK)

How to cite

APA:

Nawaz, Q., Fastner, S., Rehman, M.A.U., Ferraris, S., Perero, S., di Confiengo, G.G.,... Boccaccini, A.R. (2021). Multifunctional stratified composite coatings by electrophoretic deposition and RF co-sputtering for orthopaedic implants. Journal of Materials Science. https://dx.doi.org/10.1007/s10853-020-05725-w

MLA:

Nawaz, Qaisar, et al. "Multifunctional stratified composite coatings by electrophoretic deposition and RF co-sputtering for orthopaedic implants." Journal of Materials Science (2021).

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