Design of TEOS-GPTMS sol-gel coatings on rare-earth magnesium alloys employed in the manufacture of orthopaedic implants

Rueda, Laura María Almeida; Nieves, Claudia; Barrios, Carlos Andrés Hernández; Coy, A.E.; Viejo, F.

doi:10.1088/1742-6596/687/1/012013

Cited by 13 publications

(4 citation statements)

References 6 publications

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“…2. Sols showed a gradual increment in viscosity until a critical point was reached at 72 h. At that point (72 h) the viscosity of TMSP sol increased one order of magnitude and it is associated with the condensation reaction of the gel process [25]. Ce-TMSP shows, however, a slightly shift similar to Control and sols containing cerium.…”

Section: Characterization Of Hybrid Solsmentioning

confidence: 92%

Electrochemical study of the synergic effect of phosphorus and cerium additions on a sol-gel coating for Titanium manufactured by powder metallurgy

Alcantara-Garcia

García-Casas

Jiménez-Morales

2018

Progress in Organic Coatings

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The goal of this work was to combine the physical barrier properties provided by the sol-gel network with an active-chemistry protection against corrosion provided by corrosion inhibitors and cross-linking agents. Sol-gel coatings, organic-inorganic hybrid materials were prepared by hydrolysis and condensation of (3-glycidylox-ypropyl)trimethoxysilane (GPTMS) and tetraethylorthosilane (TEOS) in an ethanol/water solution. This coatings were satisfactorily modified by adding an inhibitor of the corrosion, namely hexahydrate cerium nitrate, and a cross-linking agent, namely tris(trimethylsilyl)phosphite (TMSP). The synergetic effect of these two compounds was evaluated by means of electrochemical characterization. The evolution rate of the hydrolysis-poly-condensation reaction was monitored by Fourier-transform infrared spectroscopy and viscosity. Once the hy-drolysis-polycondensation rate was reached, sols were deposited on titanium fabricated by powder metallurgy. The morphological characteristics and elemental distribution of the coatings were studied using scanning electrochemical microscopy (SEM). The solid-state of Si-NMR spectroscopy and thermogravimetric analysis (TGA) was employed in order to identify the cross-linking state of the coating by ensuring the creation of enough siloxane bonds. Impedance measurements were carried out to study the effect of cerium and TMSP on the corrosion resistance. It was observed that the coating with additions of cerium presented stable and good barrier features against 5 mM NaCl solution. The synergy between the cerium inhibitor and the TMSP cross-linking agent was found not to exert a positive effect because the electrochemical behaviour was dominated by the phosphorus compound over the cerium.

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Section: Characterization Of Hybrid Solsmentioning

confidence: 92%

Electrochemical study of the synergic effect of phosphorus and cerium additions on a sol-gel coating for Titanium manufactured by powder metallurgy

Alcantara-Garcia

García-Casas

Jiménez-Morales

2018

Progress in Organic Coatings

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“…The formation of SieOH bonds created due to hydrolysis reaction are revealed at 3340 cm−1 (peak A) and 950 cm−1 (peak D) [12][13][14]. Whereas, the formation of SieOeSi bonds related to the condensation reaction is reflected by the bands observed between 1000-1200 cm-1 (peak C and B) [3,13,15,16]. The correlation between each signal and the formation of the different bonds is summarized in Table 2.…”

Section: Resultsmentioning

confidence: 98%

The effect of the organosilane content on the barrier features of sol-gel anticorrosive coatings applied on carbon steel

Alcantara-Garcia

García-Casas

Jiménez-Morales

2020

Progress in Organic Coatings

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“…If this study phenomenon is of interest, a good strategy would be to dope Mg with elements such as Nd to promote a partial recovery of metallic ions where the effect on Nd ions can be sampled. An advantage of its use is that Nd acts as a grain refiner, contributing to mechanical integrity; however, its toxicological potential has limited its use in medical devices [110,111]. One possible alternative is to use it at an exposure limit with biosecurity precautions that could be implemented through the magnetic cell recruitment technique proposed by Cicha.…”

Section: Discussionmentioning

confidence: 99%

Bio-Fabrication and Experimental Validation of an Mg - 25Ca - 5Zn Alloy Proposed for a Porous Metallic Scaffold

Becerra

Torres–Castro

2021

Crystals

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This paper proposes the bio-fabrication of a porous scaffold from a selection procedure of elements taking into account biological behavior, using magnesium (Mg) alloyed with calcium (Ca) and zinc (Zn). The proposed scaffold could work as a treatment for specific pathologies in trauma and oncology, on the one hand, in addition to possible applications in osteosynthesis, through contrib-uting to osseointegration and infection control through the release of drugs. Finally, another pos-sible attribute of this alloy could be its use as a complementary treatment for osteosarcoma; this is due to the basification produced by oxidative degradation (attack on cancer cells). The evaluation of cell viability of an alloy of Mg - 25 wt% Ca - 5 wt% Zn will strengthen current perspectives on the use of Mg in the clinical evaluation of various treatments in trauma and oncology. Considera-tions on the preparation of an alloy of Mg - 25 wt% Ca - 5 wt% Zn and its morphological charac-terization will help researchers understand its applicability for the development of new surgical techniques and lead to a deeper investigation of alternative treatments. However, it is very im-portant to bear in mind the mechanical effect of elements such as Ca and Zn on the degradation of the alloy matrix; the best alternative to predict the biological-mechanical potential starts with the selection of the essential-nutritional elements and their mechanical evaluation by mi-cro-indentation due to the fragility of the matrix. Therefore, the morphological evaluation of the specimens of Mg - 25 wt% Ca - 5 wt% Zn will show the crystallinity of the alloy; these results to-gether contribute to the design of biomedical alloys for use in treatments for various medical spe-cialties. The results indicated that cell viability is not affected, and there are no morphological changes in the cells.

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Design of TEOS-GPTMS sol-gel coatings on rare-earth magnesium alloys employed in the manufacture of orthopaedic implants

Cited by 13 publications

References 6 publications

Electrochemical study of the synergic effect of phosphorus and cerium additions on a sol-gel coating for Titanium manufactured by powder metallurgy

Electrochemical study of the synergic effect of phosphorus and cerium additions on a sol-gel coating for Titanium manufactured by powder metallurgy

The effect of the organosilane content on the barrier features of sol-gel anticorrosive coatings applied on carbon steel

Bio-Fabrication and Experimental Validation of an Mg - 25Ca - 5Zn Alloy Proposed for a Porous Metallic Scaffold

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