NaOH treatment of vacuum-plasma-sprayed titanium on carbon fibre-reinforced poly(etheretherketone)

Carbon fibre-reinforced polyetheretherketone (CF-PEEK) substrates were coated with titanium by vacuum-plasma-spraying and chemically treated in 10 M sodium hydroxide (NaOH) solution. After NaOH treatment, the specimens were immersed in simulated body fluid (SBF) containing ions in concentrations similar to those of human blood plasma. Scanning electron microscopy, energy-dispersive X-ray analysis and diffuse reflectance Fourier transformed-infrared spectroscopy were used to analyse the NaOH-treated VPS-Ti surface and the calcium phosphate layer formed during immersion in SBF. It was observed that a carbonate-containing calcium phosphate layer was formed on the NaOH-treated VPS-Ti surface during immersion in SBF, whereas no calcium phosphate precipitation occurred on the untreated surfaces. It is therefore concluded that vacuum-plasma-spraying with titanium and subsequent chemical modification in 10 M NaOH solution at 60°C for 2 h is a suitable method for the preparation of bioactive coatings for bone ongrowth on CF-PEE

Surface activation of polyetheretherketone (PEEK) and formation of calcium phosphate coatings by precipitation

Plasma activation of polyetheretherketone (PEEK) surfaces and the influence on coating formation in a supersaturated calcium phosphate solution was investigated in this study. It was observed that plasma treatment in a N2/O2 plasma had a significant effect on the wettability of the PEEK surface. The contact angle decreased from 85° to 25° after plasma treatment. Cell culture testing with osteoblastic cell lines showed plasma activation not to be disadvantageous to cell viability. X-ray photoelectron spectroscopy (XPS) analysis was performed to characterize the chemical composition of the PEEK surfaces. It was observed that the O1s intensity increased with plasma activation time. At the C1s peak the appearance of a shoulder at higher binding energies was observed. Coating of PEEK was performed in a supersaturated calcium phosphate solution. Coating thicknesses of up to 50 μm were achieved after 24 days of immersion. Plasma activation followed by nucleation in a highly saturated hydroxyapatite solution had a positive effect on the growth rate of the layer on PEEK. Chemical analysis revealed that the coating consists of a carbonate-containing calcium phosphat

NaOH treatment of vacuum-plasma-sprayed titanium on carbon fibre-reinforced poly(etheretherketone)

ISSN:0957-4530ISSN:1573-483

Ion-, photoelectron- and laser-assisted analytical investigation of nano-structured mixed HfO2-SiO2 and ZrO2-SiO2 thin films

In this study, the surface and depthwise composition of hafnium- and zirconium-based inorganic\u2013organic hybrid layers, as well as of binary HfO2\u2013SiO2 and ZrO2\u2013SiO2 thin \ufb01lms, obtained by calcination at high temperature (T = 800\ub0C) of the hybrid \ufb01lms, were analysed by using different analytical methods which can deliver complementary information on chemical composition and both in-depth and lateral distribution of the species. In particular, X-ray photoelectron spectroscopy (XPS) was used to investigate the chemical composition of the thin \ufb01lms (quantitative analysis, oxidation states, nature of the interaction between host matrix and guest species) on the surface as well along the \ufb01lm thickness. The depthwise distribution of the involved species was thoroughly investigated by means of secondary ion mass spectrometry (SIMS). Information concerning the lateral distribution of the species was gained also by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Finally, the dielectric response of two samples was characterized through broadband dielectric spectroscopy, which provided a value of real permittivity[e'(w)] ranging from 7.5 to 9.5 for a \ufb01lm without the cluster, while in a sample embedding the hafnium cluster these values range in the interval 7.2\u20137.4. The information obtained by the different analytical methods demonstrated the formation of a homogeneous in-depth nanocomposition of the thin \ufb01lms, which would be suitable for frontier applications

Surface activation of polyetheretherketone (PEEK) and formation of calcium phosphate coatings by precipitation

ISSN:0957-4530ISSN:1573-483