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

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