Transition metal oxides deposited on rhodium and platinum: Surface chemistry and catalysis

Boffa, A. B.

doi:10.2172/10186279

Cited by 2 publications

(2 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The XPS spectra were recorded in normal emission. For the XPS analyses, the CasaXPS 2.3.14 software (Shirley background type) [42], with the help of XPS tables [43][44][45][46], was used. All the binding energy values presented in this paper were charge corrected to C 1s at 284.8 eV.…”

Section: Xps Studiesmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of porous coatings obtained on Ti-Nb-Zr-Sn alloy biomaterial by plasma electrolytic oxidation: characterisation and modelling

Rokosz

Hryniewicz

Raaen

et al. 2016

Int J Adv Manuf Technol

View full text Add to dashboard Cite

In the paper, the fabrication method and characteristics of porous coatings on Ti-Nb-Zr-Sn alloy biomaterial obtained by plasma electrolytic oxidation (PEO) are presented. The PEO process was performed at two voltages of 180 ± 10 and 450 ± 10 V, respectively, during 3 min of treatment in the electrolyte based on orthophosphoric acid with copper II nitrate of initial temperature of 20 ± 2°C. Scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDS), glow discharge optical emission spectroscopy (GDOES), Xray photoelectron spectroscopy (XPS) and 2D roughness measurements were performed on the samples. The study results indicate an enrichment of the porous layer (18 and 21 μm thick, for 180 and 450 V, respectively)

show abstract

Section: Xps Studiesmentioning

confidence: 99%

“…In order to find the oxidation stages of chemical elements, high-resolution XPS measurements were performed and the results are presented in Figs. 26 and 27 and after quantitative analyses in Tables 3, 4, and zirconium Zr 4+ [43][44][45][46]. Tin present as a component of the alloy studied was not detected by XPS method in the outer 10 nm of PEO coatings.…”

mentioning

confidence: 99%

Investigation of porous coatings obtained on Ti-Nb-Zr-Sn alloy biomaterial by plasma electrolytic oxidation: characterisation and modelling

Rokosz

Hryniewicz

Raaen

et al. 2016

Int J Adv Manuf Technol

View full text Add to dashboard Cite

show abstract

Development of copper-enriched porous coatings on ternary Ti-Nb-Zr alloy by plasma electrolytic oxidation

Rokosz

Hryniewicz

Raaen

et al. 2016

Int J Adv Manuf Technol

View full text Add to dashboard Cite

In this paper, a preparation method and characteristics of porous coatings enriched in copper distributed in the whole volume on a ternary Ti-Nb-Zr alloy biomaterial obtained by plasma electrolytic oxidation (PEO) in an electrolyte containing H 3 PO 4 within Cu(NO 3 ) 2 at potentials of 180 and 450 V are presented. It has been shown that the PEO potential has impact on the thickness of the coatings, i.e., the higher the potential used, the thicker the coating obtained. Using XPS study, it was shown that copper inside the coating appears as Cu + and Cu 2+ ions, while titanium, niobium, and zirconium appear as Ti 4+ , Nb 5+ , and Zr x+ (x ≤ 2), respectively. It was also found that the roughness of PEO coating formed at 450 V is higher than the one obtained at 180 V, and it is well correlated with bigger pores after the PEO treatment. Additionally, in this paper two PEO coating models composed of three sub-layers are presented. The thickness of the outer top porous sub-layer obtained after PEO oxidation at both 180 and 450 V equals to about 2 μm, while the semi-porous as well as transition sub-layers are thicker after PEO processing at 450 V (5 μm) than those obtained at 180 V (4 μm thick). The creation of the top porous and transition compact sub-layer of PEO coating may be explained by switch-on and switch-off of the PEO potential, while the middle and semi-porous sub-layers are most likely formed during the stable voltage conditions of PEO treatment.

show abstract

Transition metal oxides deposited on rhodium and platinum: Surface chemistry and catalysis

Cited by 2 publications

References 59 publications

Investigation of porous coatings obtained on Ti-Nb-Zr-Sn alloy biomaterial by plasma electrolytic oxidation: characterisation and modelling

Investigation of porous coatings obtained on Ti-Nb-Zr-Sn alloy biomaterial by plasma electrolytic oxidation: characterisation and modelling

Development of copper-enriched porous coatings on ternary Ti-Nb-Zr alloy by plasma electrolytic oxidation

Contact Info

Product

Resources

About