Triethylphosphite as a network forming agent enhances in vitro biocompatibility and corrosion protection of hybrid organic–inorganic sol–gel coatings for Ti6Al4V alloys

hadad, Amir A. El; Barranco, Violeta; Jiménez-Morales, Antonia; Hickman, Graham J.; Galván, J.C.; Perry, Carole C.

doi:10.1039/c4tb01175a

Cited by 13 publications

(13 citation statements)

References 35 publications

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“…A promising research line consists in introducing phosphorus precursors into organic-inorganic hybrid sol-gel coatings. In this way, El Hadad et al have introduced triethylphosphite in sol-gel coatings based on mixtures of γ-methacryloxypropyltrimethoxysilane and tetramethylorthosilicate, not just for improving the corrosion protection properties of the coatings but also their biocompatibility [38].…”

Section: Introductionmentioning

confidence: 99%

Native Oxide Films on AZ31 and AZ61 Commercial Magnesium Alloys – Corrosion Behaviour, Effect on Isothermal Oxidation and Sol–gel Thin Film Formation

Feliú¹,

hadad²,

Barranco³

et al. 2015

New Trends in Alloy Development, Characterization and Application

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The authors present a review of their recent research work in an endeavour to interpret the influence of native oxide films on the corrosion behaviour of commercial AZ31 and AZ61 magnesium alloys or on the oxidation kinetics in air at 200°C. The tendency of some of these thin films to be sufficiently protective in mild or weak corrosive environments is examined. For obtaining oxide films with different protective properties, some of the specimens are tested with the surface in the as-received condition, while others are tested immediately after mechanical polishing. The technique applied to characterise thin (thickness of just a few nanometres) oxide films present on the surface of alloys has basically been XPS (X-ray photoelectron spectroscopy) in combination with ion sputtering. Oxidation resistance of the alloys is quantified by thermo gravimetric (TG) curves and their corrosion rate is evaluated by Electrochemical Impedance Spectroscopy (EIS) and hydrogen evolution measurement in chloride solutions with different aggressivity. Emphasis is placed on the possible effects of: (a) the different thickness of the native oxide films formed on the polished surfaces on the corrosion behaviour of the alloys; and (b) the different film homogeneity and uniformity on the oxidation results. Finally, an attempt will be made to learn more about the influence of the native oxide films that cover the substrate on the subsequent growth and protective behaviour of the sol-gel coatings.

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Section: Introductionmentioning

confidence: 99%

Native Oxide Films on AZ31 and AZ61 Commercial Magnesium Alloys – Corrosion Behaviour, Effect on Isothermal Oxidation and Sol–gel Thin Film Formation

Feliú¹,

hadad²,

Barranco³

et al. 2015

New Trends in Alloy Development, Characterization and Application

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“…Three types of impedance plots are given in Figure 11 for EEC2). It is known that low values of χ 2 are related to a beter quality of the iting results [31,32].…”

Section: Corrosion Behaviormentioning

confidence: 99%

“…These impedance spectra can be ascribed to the typical behavior of porous thin ilms deposited on metal substrates with high corrosion resistance [21,31,32,46,47]. In the irst approach, the single electrical equivalent circuit EEC1 shown in Figure 10a can be used to describe the electrochemical behavior of these systems.…”

Section: Corrosion Behaviormentioning

confidence: 99%

“…The corrosion behavior of the HA ilm/Ti6Al4V system was evaluated by applying electrochemical impedance spectroscopy (EIS) [21,31,32]. These electrochemical measurements were performed using an AutoLab potentiostat/galvanostat PGSTAT30 equipped with a FRA2 frequency response analyzer module (EcoChemie, The Netherlands).…”

Section: Corrosion Behaviormentioning

confidence: 99%

“…In previous studies, we have prepared organic-inorganic hybrid sol-gel ilms with nanocrystalline hydroxyapatite as a iller and triethylphosphite (TEP)as a network forming agent to enhance the in vitro biocompatibility and corrosion protection of these coatings deposited on Ti6Al4V alloys [31,32]. Now, the purpose of this new study is to apply the CRTA technique to crystallize synthetic HA with a controlled speciic surface and homogeneous distribution of pores, appropriate to be used in bone implantation and other formulations for orthopedic surgery.…”

Section: Introductionmentioning

confidence: 99%

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Controlled Rate Thermal Analysis (CRTA) as New Method to Control the Specific Surface in Hydroxyapatite Thin Coatings

Peón¹,

hadad²,

García-Galván³

et al. 2017

Modern Technologies for Creating the Thin-Film Systems and Coatings

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The control of the texture in synthetic hydroxyapatite ceramics had limited their application in the ield of the materials for bone implantation, even more when it is used as a illing in cements and other formulations in orthopedic surgery. The present article shows preliminary results demonstrating the efectiveness of a modiication of the controlled rate thermal analysis (CRTA), developed by J. Rouquerol, used for the preparation of ceramic materials with controlled textural characteristics, during the formation of ceramic powders of synthetic hydroxyapatite at low temperatures. The thermal treatments of the hydroxyapatite were carried out in a device connected to a computer, to control temperature and pressure system, keeping the decomposition speed constant. Results, reported when preparing ceramic powders of hydroxyapatite at 300 and 850°C under controlled pressure, using synthetic hydroxyapatite with a Ca/P molar ratio equal to 1.64, were checked using IR spectroscopy and X-ray difraction, showed that the formed phase corresponds to that of crystalline hydroxyapatite, even at 300°C of maximum temperature. Values of speciic surface (BET) between 17 and 66 m 2 /g, with pore size in the range of 50-300 Å in both cases are obtained by N 2 absorption isotherms, when analyzing the isotherms of nitrogen absorption.

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Electrical impedance characterization and modelling of Ti‐Β implants

Navarro,

Barrera,

Olmo

et al. 2024

J Biomedical Materials Res

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Commercially pure titanium (c.p. Ti) and Ti6Al4V alloys are the most widely used metallic biomaterials in the biomedical sector. However, their high rigidity and the controversial toxicity of their alloying elements often compromise their clinical success. The use of porous β‐Titanium alloys is proposed as a solution to these issues. In this regard, it is necessary to implement economic, repetitive, and non‐destructive measurement techniques that allow for the semi‐quantitative evaluation of the chemical nature of the implant, its microstructural characteristics, and/or surface changes. This study proposes the use of simple measurement protocols based on electrical impedance measurements, correlating them with the porosity inherent to processing conditions (pressure and temperature), as well as the chemical composition of the implant. Results revealed a clear direct relationship between porosity and electrical impedance. The percentage and/or size of the porosity decrease with an increase in compaction pressure and temperature. Moreover, there is a notable influence of the frequency used in the measurements obtained. Additionally, the sensitivity of this measurement technique has enabled the evaluation of differences in chemical composition and the detection of intermetallics in the implants. For the first time in the literature, this research establishes relationships between stiffness and electrical impedance, using approximations and models for the observed trends. All the results obtained corroborate the appropriateness of the technique to achieve the real‐time characterization of Titanium implants, in an efficient and non‐invasive way.

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Triethylphosphite as a network forming agent enhances in vitro biocompatibility and corrosion protection of hybrid organic–inorganic sol–gel coatings for Ti6Al4V alloys

Abstract: Introduction of phosphorous into hybrid silica sol–gel coatings on Ti6Al4V gives materials demonstrating higher levels of intermolecular condensation and fibrinogen uptake as well as improved in vitro biocompatibility and corrosion protection.

Cited by 13 publications

References 35 publications

Native Oxide Films on AZ31 and AZ61 Commercial Magnesium Alloys – Corrosion Behaviour, Effect on Isothermal Oxidation and Sol–gel Thin Film Formation

Native Oxide Films on AZ31 and AZ61 Commercial Magnesium Alloys – Corrosion Behaviour, Effect on Isothermal Oxidation and Sol–gel Thin Film Formation

Controlled Rate Thermal Analysis (CRTA) as New Method to Control the Specific Surface in Hydroxyapatite Thin Coatings

Electrical impedance characterization and modelling of Ti‐Β implants

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