XPS study of apatite-based coatings prepared by sol–gel technique

Kačiulis, S.; Mattogno, G.; Pandolfi, L.; Cavalli, Maria Chiara; Gnappi, G.; Montenero, A.

doi:10.1016/s0169-4332(99)00267-6

Cited by 160 publications

(92 citation statements)

References 12 publications

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“…The O 1s spectrum in Figure 13d appears a broad asymmetry peak, which can be deconvoluted into two peaks. An intense peak at 531.3 eV is assigned to the combined contribution of OH − , PO4 3− and CO3 2− groups, which are inseparable by peak-fitting routine due to their similar binding energies [60,61]. The minor peak at 532.7 eV is attributed to the adsorbed water or C-and O-containing contaminations [61,62].…”

Section: Xps and Ft-ir Analysismentioning

confidence: 99%

Nanocrystalline β-Ta Coating Enhances the Longevity and Bioactivity of Medical Titanium Alloys

Liu

Jiang

2016

Metals

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A β-Ta nanocrystalline coating was engineered onto a Ti-6Al-4V substrate using a double cathode glow discharge technique to improve the corrosion resistance and bioactivity of this biomedical alloy. The new coating has a thickness of~40 µm and exhibits a compact and homogeneous structure composed of equiaxed β-Ta grains with an average grain size of~22 nm, which is well adhered on the substrate. Nanoindentation and scratch tests indicated that the β-Ta coating exhibited high hardness combined with good resistance to contact damage. The electrochemical behavior of the new coating was systematically investigated in Hank's physiological solution at 37 • C. The results showed that the β-Ta coating exhibited a superior corrosion resistance as compared to uncoated Ti-6Al-4V and commercially pure tantalum, which was attributed to a stable passive film formed on the β-Ta coating. The in vitro bioactivity was studied by evaluating the apatite-forming capability of the coating after seven days of immersion in Hank's physiological solution. The β-Ta coating showed a higher apatite-forming ability than both uncoated Ti-6Al-4V and commercially pure Ta, suggesting that the β-Ta coating has the potential to enhance functionality and increase longevity of orthopaedic implants.

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Section: Xps and Ft-ir Analysismentioning

confidence: 99%

Nanocrystalline β-Ta Coating Enhances the Longevity and Bioactivity of Medical Titanium Alloys

Liu

Jiang

2016

Metals

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“…The lower binding energy ranging from 529 to 530 eV, can be assigned to the binding state of the perovskite structure from XPS studies on (Ba, Sr)TiO 3 and CaTiO 3 . [15][16][17][18][19] On the other hand, for t dep ¼ 7:2 ks. the higher binding energy over 530 eV has been explained as being a less negatively charged form, 15) the C-O binding state, 16) the -OH binding state by water layer adhesion 17,18) and the Ti 2 O 3 phase or free O atoms.…”

Section: à6mentioning

confidence: 99%

Microstructure and Electrical Conductivity of CaRuO<SUB>3</SUB> Thin Films Prepared by Laser Ablation

2008

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CaRuO 3 (CRO) thin films were prepared by laser ablation at substrate temperatures (T sub ) ranging from room temperature to 1073 K in a high vacuum (10 À6 Pa) atmosphere and at oxygen pressures (P O2 ) of 0.013 to 130 Pa. The effects of deposition conditions on the microstructure and electrical conductivity () were investigated. Rectangular-shaped CRO island grains grew at 0:013 Pa < P O2 < 130 Pa and T sub > 873 K. At P O2 ¼ 0:13 Pa and T sub ¼ 973 K, as well as at P O2 ¼ 13 Pa and T sub ¼ 873 K, well-connected island grains were observed. While the composition of island grains was nearly stoichiometric independently of T sub , the Ca fraction of film matrix increased with increasing T sub . CRO thin films with less than 10 4 SÁm À1 showed semiconducting behavior. At T sub ¼ 973 K and P O2 ¼ 0:13 Pa, CRO thin films exhibited metallic conduction with the highest of 1:5 Â 10 5 SÁm À1 at room temperature.

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“…2(d) and H 2 O, respectively, consistent with other work. [14] Exposure to the MEM + H 2 O 2 media leads to an increase in the nitrogen concentration at the surface to approximately 8 at.% and a shift in the N 1s binding energy to 399.8 eV. SEM images of the Ti-13Nb-13Zr alloy surfaces after 125 days exposure in the MEM and MEM+H 2 O 2 solutions are given in Fig.…”

Section: Resultsmentioning

confidence: 95%

“…Ca and P are present at approximately 2 at.%, and the P 2p 3/2 and Ca 2p 3/2 peaks occur at 133.4 and 347.6 eV, respectively, corresponding to those expected for HA. [13,14] During XPS spectral acquisition, some differential charging was observed, suggesting incomplete formation of an HA surface layer (e.g. an island-like distribution).…”

Section: Resultsmentioning

confidence: 99%

Investigation of the electrochemical behaviour and surface chemistry of a Ti‐13Nb‐13Zr alloy exposed in MEM cell culture media with and without the addition of H₂O₂

Baker

Assis

Grilli

et al. 2008

Surface & Interface Analysis

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Promoting and understanding the formation of hydroxyapatite (HA) on biocompatible metals in the body is a very important topic of biomaterials research. In this paper, the formation of HA on a near-β Ti-13Nb-13Zr alloy by immersion in minimal essential medium (MEM) with and without the addition of H 2 O 2 has been studied using electrochemical methods, SEM and XPS. The Ti-13Nb-13Zr alloy exhibits passive behaviour over a wide potential range when immersed in MEM, and the passive film is composed of an inner barrier layer and an outer porous layer. Exposure for 72 h in the MEM solution results in the formation of a surface layer composed of an island-like distribution of HA material and adsorbed amino acids. The addition of H 2 O 2 to the MEM solution strongly promotes the formation of a thicker, continuous nanocomposite layer of HA and amino acids. For Ti alloys, the release of H 2 O 2 in the anti-inflammatory response appears to be an important beneficial process, as it serves to accelerate osseointegration.

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XPS study of apatite-based coatings prepared by sol–gel technique

Cited by 160 publications

References 12 publications

Nanocrystalline β-Ta Coating Enhances the Longevity and Bioactivity of Medical Titanium Alloys

Nanocrystalline β-Ta Coating Enhances the Longevity and Bioactivity of Medical Titanium Alloys

Microstructure and Electrical Conductivity of CaRuO<SUB>3</SUB> Thin Films Prepared by Laser Ablation

Investigation of the electrochemical behaviour and surface chemistry of a Ti‐13Nb‐13Zr alloy exposed in MEM cell culture media with and without the addition of H₂O₂

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XPS study of apatite-based coatings prepared by sol–gel technique

Cited by 160 publications

References 12 publications

Nanocrystalline β-Ta Coating Enhances the Longevity and Bioactivity of Medical Titanium Alloys

Nanocrystalline β-Ta Coating Enhances the Longevity and Bioactivity of Medical Titanium Alloys

Microstructure and Electrical Conductivity of CaRuO<SUB>3</SUB> Thin Films Prepared by Laser Ablation

Investigation of the electrochemical behaviour and surface chemistry of a Ti‐13Nb‐13Zr alloy exposed in MEM cell culture media with and without the addition of H2O2

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Investigation of the electrochemical behaviour and surface chemistry of a Ti‐13Nb‐13Zr alloy exposed in MEM cell culture media with and without the addition of H₂O₂