title: Electrophoretic co-deposition of polyvinyl alcohol (PVA) reinforced alginate-Bioglass® composite coating on stainless steel: mechanical properties and in-vitro bioactivity assessment.
abstract: PVA reinforced alginate-bioactive glass (BG) composite coatings were produced on stainless steel by a single step electrophoretic deposition (EPD) process. The present paper discusses the co-deposition mechanism of the three components and presents a summary of the relevant properties of the composite coatings deposited from suspensions with different PVA concentrations. Homogeneous composite coatings with compact microstructure and increased thickness, i.e. as high as 10 μm, were observed by scanning electron microscopy (SEM). The surface roughness of coatings with different PVA contents was slightly increased, while a significant increase of water contact angles due to PVA addition was detected and discussed. Improved adhesion strength of coatings containing different amounts of PVA was quantitatively and qualitatively confirmed by pull-off adhesion and cycled bending tests, respectively. In-vitro bioactivity tests were performed in simulated body fluid (SBF) for 0.5, 1, 2, 4, 7, and 14 days, respectively. The decomposition rate of the coatings was reduced with PVA content, and rapid hydroxyapatite forming ability of the composite coatings in SBF was confirmed by FTIR and XRD analyses. According to the results of this study, composite alginate-Bioglass® bioactive coatings combined with PVA are proposed as promising candidates for dental and orthopedic applications.
authors.affiliation: Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstrasse 6, 91058 Erlangen, Germany.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Chen
authors.affiliation: Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstrasse 6, 91058 Erlangen, Germany.
authors.forename: Sandra
authors.initials: S
authors.lastname: Cabanas-Polo
authors.affiliation: Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstrasse 6, 91058 Erlangen, Germany.
authors.forename: Ourania-Menti
authors.initials: OM
authors.lastname: Goudouri
authors.affiliation: Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstrasse 6, 91058 Erlangen, Germany. Electronic address: aldo.boccaccini@ww.uni-erlangen.de.
authors.forename: Aldo R
authors.initials: AR
authors.lastname: Boccaccini
mesh_terms: D000464:Alginates / Q000737:chemistry*; D002516:Ceramics / Q000737:chemistry*; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D004586:Electrophoresis; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D013193:Stainless Steel / Q000737:chemistry*; D017155:Wettability
chemical_list: D000464:Alginates; C022107:Bioglass; D020099:Coated Materials, Biocompatible; D006603:Hexuronic Acids; D013193:Stainless Steel; D020723:Glucuronic Acid; D011142:Polyvinyl Alcohol
keywords: Adhesion strength; Alginate; Bioactive glass; Bioactivity; Electrophoretic deposition; Polyvinyl alcohol