Modification of Ti6Al4V implant surfaces by biocompatible TiO 2 /PCL hybrid layers prepared via sol-gel dip coating: Structural characterization, mechanical and corrosion behavior

Catauro, Michelina; Bollino, Flavia; Giovanardi, Roberto; Veronesi, Paolo

doi:10.1016/j.msec.2016.12.046

Cited by 75 publications

(46 citation statements)

References 29 publications

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“…The increase in CNT greatly improves the adhesion of the coating to the substrate. A minimum critical load of 21.84 ± 0.50 N indicates that the presence of phosphates also increases the resistance of the polymer coating, like the results found by Catauro et al 56 . The results indicate that by increasing the adhesion to the substrate by incorporating CP and CNT, a minor release of components to the medium occurs, which makes the HOS cells have a good behavior in terms of cell viability and activity by measurement of ALP.…”

Section: Discussionsupporting

confidence: 79%

Functional evaluation and testing of a newly developed Teleost’s Fish Otolith derived biocomposite coating for healthcare

Montañez

Carreño

Escobar

et al. 2020

Sci Rep

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Polymers such as polycaprolactone (PCL) possess biodegradability, biocompatibility and affinitywith other organic media that makes them suitable for biomedical applications. in this work, a novel biocomposite coating was synthesised by mixing pcL with layers of calcium phosphate (hydroxyapatite, brushite and monetite) from a biomineral called otolith extracted from Teleost fish (Plagioscion Squamosissimus) and multiwalled carbon nanotubes in different concentrations (0.5, 1.0 and 1.5 g/L). The biocomposite coating was deposited on an osteosynthesis material Ti6Al4V by spin coating and various tests such as fourier transformation infrared spectroscopy (ftiR), Raman spectroscopy, scanning electron microscopy (SeM), transmission electron microscopy (teM), scratch tests, Mtt reduction cytotoxicity, HoS cell bioactivity (human osteosarcoma) by alkaline phosphatase (ALP) and fluorescence microscopy were performed to comprehensively evaluate the newly developed biocoating. it was found that an increase in the concentration of carbon nanotube induced microstructural phase changes of calcium phosphate (cp) leading to the formation of brushite, monetite and hydroxyapatite. While we discovered that an increase in the concentration of carbon nanotube generally improves the adhesion of the coating with the substrate, a certain threshold exists such that the best deposition surfaces were obtained as PCL/CP/CNT 0.0 g/L and PCL/CP/CNT 0.5 g/L.Metallic biomaterials used in implantology are usually inert, since there is no ion active exchange. This property allows the cells to recognize the microenvironment, proliferate and differentiate in a better way. For this reason, biocompatible materials in coatings such as calcium ceramics with a chemical nature like bone, or natural or synthetic polymers allows easy incorporation of bioactive materials or active ingredients making the recovery of hard tissue faster.One of the widely used polymers in tissue engineering is polycaprolactone (PCL -poly ε-caprolactone). It possesses semi-crystalline state, hydrophobic character, good solubility, low melting point, adequate degradation rate and excellent compatibility 1-3 , making it a good candidate for use as a biocoating material. One drawback as with many other polymers that the PCL has is its low mechanical strength which is proposed to be modified in this paper via addition of functionalised multiwalled carbon nanotubes (MWCNT) (Fig. 1). Recently, it has been shown that PCL and carbon nanotubes can forms an interface that improves certain properties in the composite 4 . Besides, carbon nanotubes can be functionalized, allowing other molecules to be adhered to the walls and ends, improving the properties of the materials. This strategy has been widely used to incorporate calcium phosphates (CP) like hydroxyapatite 5-7 , CaCO 3 2 or polymers for applications such as cancer treatment, drug transport, biotechnological applications and energy [8][9][10] . As Surmenev et al. indicate, much of the in vitro results of inorganic Ca-P coatings show...

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Section: Discussionsupporting

confidence: 79%

Functional evaluation and testing of a newly developed Teleost’s Fish Otolith derived biocomposite coating for healthcare

Montañez

Carreño

Escobar

et al. 2020

Sci Rep

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“…To obtain OIH with anticorrosive performance, additional functions must be introduced within the OIH network, such as corrosion inhibitors [16,[49][50][51]. The alternatives proposed in the literature include OIH materials containing corrosion inhibitors such as zirconium [33,[52][53][54][55][56], titanium [30,57,58] and cerium [50,55,59]. M. Catauro et al synthesized OIH sol-gel materials based on zirconia (ZrO 2 ) and poly(ε-caprolactone) to coat pure titanium for implants application [56].…”

Section: Introductionmentioning

confidence: 99%

“…Later, the same authors reported the synthesis of OIH materials by sol-gel method using TiO 2 for the inorganic matrix and poly(ε-caprolactone) as organic component. The material produced was used to improve the performance of Ti6Al4V implants [58]. Most of the data found in the literature indicate that the OIH sol-gel materials show an enormous potential in the field of coatings for corrosion mitigation.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Figueira

2020

Polymers

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The corrosion process is a major source of metallic material degradation, particularly in aggressive environments, such as marine ones. Corrosion progression affects the service life of a given metallic structure, which may end in structural failure, leakage, product loss and environmental pollution linked to large financial costs. According to NACE, the annual cost of corrosion worldwide was estimated, in 2016, to be around 3%-4% of the world's gross domestic product. Therefore, the use of methodologies for corrosion mitigation are extremely important. The approaches used can be passive or active. A passive approach is preventive and may be achieved by emplacing a barrier layer, such as a coating that hinders the contact of the metallic substrate with the aggressive environment. An active approach is generally employed when the corrosion is set in. That seeks to reduce the corrosion rate when the protective barrier is already damaged and the aggressive species (i.e., corrosive agents) are in contact with the metallic substrate. In this case, this is more a remediation methodology than a preventive action, such as the use of coatings. The sol-gel synthesis process, over the past few decades, gained remarkable importance in diverse areas of application. Sol-gel allows the combination of inorganic and organic materials in a single-phase and has led to the development of organic-inorganic hybrid (OIH) coatings for several applications, including for corrosion mitigation. This manuscript succinctly reviews the fundamentals of sol-gel concepts and the parameters that influence the processing techniques. The state-of-the-art of the OIH sol-gel coatings reported in the last few years for corrosion protection, are also assessed. Lastly, a brief perspective on the limitations, standing challenges and future perspectives of the field are critically discussed.Polymers 2020, 12, 689 The development of OIH sol-gel coatings, based on siloxanes, for corrosion mitigation, has been widely studied in the last few years [2,31,[36][37][38]. Numerous studies have been conducted since the early 1990s [39,40]. The studies performed showed that siloxanes were effective in mitigating the corrosion processes of different metallic substrates. This development was mainly due to the need for alternative environmentally friend materials and processes to replace the traditional chromium-based pre-treatments. Hexavalent chromium (Cr (VI)) is carcinogenic and shows high environmental toxicity and its use has been forbidden since 2006. However, Cr(VI) based pre-treatments improve the coating adherence to the substrate and are effective corrosion inhibitors [41][42][43] which make its replacement challenging. The use of the sol-gel method to produce OIH coatings for corrosion mitigation suits the main requirements of what should be an environmentally friendly process (i.e., excludes washing stages; it is a waste-free method) and allows one to obtain coatings with high purity and specific pore volumes and surface areas. Since it is a mild synthesis...

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“…One of those methods is through reinforcing materials such as zirconia oxide (ZrO 2 ), carbon nanotubes (CNTs), and titanium oxide (TiO 2 ) [11,[83][84][85][86][87]. On the other hand, several reported regarding the HAp-based coating showed the enhancement in adhesion strength approaching 70% greater compared to pure HAp coating [88].…”

Section: Electrochemical Depositionmentioning

confidence: 99%

Hydroxyapatite-Based Coating on Biomedical Implant

Harun¹,

Asri²,

Sulong³

et al. 2018

Hydroxyapatite - Advances in Composite Nanomaterials, Biomedical Applications and Its Technological Facets

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The use of metallic biomaterials for replacement of biomedical implants has been traced back from the nineteenth century. These metallic biomaterials have been declared as clinical success as their mechanical properties that satisfy the prerequisite of the human bone. Nevertheless, critical issues of the materials when they are utilised as implants; including the releasing toxic and harmful metal ions through wear and corrosion processes after longer implantation. Besides that, the bonding strength between bone and implants itself is considered weak due to the diferent components of human bone and metal implants. Hence, developing hydroxyapatite (HAp) coating on metallic biomaterials is expected to overcome the problems faced by biocompatible metallic biomaterials. As far as this, various commercial techniques have been introduced to develop the HAp coating on metallic biomaterials. The techniques are including plasma-spraying method, sol-gel dip-coating, electrochemical deposition and high-velocity suspension plasma-spraying. The formation of HAp coating on metallic biomaterials improved the corrosion resistance together promoting its load-bearing ability and enhanced substrate-coating adhesion.

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Modification of Ti6Al4V implant surfaces by biocompatible TiO 2 /PCL hybrid layers prepared via sol-gel dip coating: Structural characterization, mechanical and corrosion behavior

Cited by 75 publications

References 29 publications

Functional evaluation and testing of a newly developed Teleost’s Fish Otolith derived biocomposite coating for healthcare

Functional evaluation and testing of a newly developed Teleost’s Fish Otolith derived biocomposite coating for healthcare

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Hydroxyapatite-Based Coating on Biomedical Implant

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