Tuning surface morphology and crystallinity of anodic TiO2 nanotubes and their response to biomimetic bone growth for implant applications

Nasirpouri, Farzad; Yousefi, Iman; Moslehifard, Elnaz; Khalil‐Allafi, Jafar

doi:10.1016/j.surfcoat.2017.02.006

Cited by 33 publications

(26 citation statements)

References 45 publications

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“…While this equation provided an approximation of the oxide phase ratio present, it was based on the assumption that the oxide layers were fully crystalline. A number of previous studies combining anodization with subsequent heat treatment processing, as well the previous study in our own laboratories, have suggested that many of these anodized oxide layers may not be fully crystalline. Additionally, XRD analyses provide macroscopic information on the oxide phases present, but no information on the microscopic spatial distribution of these oxide phases within the anodized layers.…”

Section: Discussionmentioning

confidence: 85%

Photofunctionalization of anodized titanium surfaces using UVA or UVC light and its effects against Streptococcus sanguinis

et al. 2017

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UV light preirradiation of anodized titanium oxide layers has recently been shown to produce a photocatalytic effect that may reduce early bacterial attachment on titanium surfaces. Streptococcus species have been identified as primary early colonizers and contribute to early biofilm formation on dental implant surfaces. Anodized layers with primarily amorphous, primarily anatase, primarily rutile, and mixtures of anatase and rutile phase oxides were preirradiated with UVA or UVC light for 10 min. Nanoscale surface roughness and pre- and post-UV-irradiated wettability were measured for each anodization group. Sample groups were subjected to streptococcus sanguinis for a period of 24 h. Bacterial attachment and killing efficacy were measured and compared to the corresponding non-UV control groups. UVA treatments showed trends of at least a 20% reduction in bacterial attachment regardless of the crystallinity, or combination of oxide phases present. Anodized layers consisting of primarily anatase phase on the outermost surface were shown to have a killing efficacy of at least 50% after preirradiation with UVA light. Anodized layers containing disperse mixtures of anatase and rutile phases at the outermost surface showed at least a 50% killing efficacy after pre-irradiation with either UVA or UVC light. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 2284-2294, 2018.

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Section: Discussionmentioning

confidence: 85%

Photofunctionalization of anodized titanium surfaces using UVA or UVC light and its effects against Streptococcus sanguinis

et al. 2017

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“…As in the case of as-anodized surfaces, the same tendency was noted for annealed state of both ground and polished surfaces, the coating feature remained significantly affected by the surface treatment before anodization ( Figure 5). Several studies [1,3,6,15] confirmed that the as-anodized TiO2 nanotubes are in amorphous state. However, when they are heat-treated at higher temperatures, the NTs crystallize to anatase phase or a mix of anatase and rutile phases.…”

Section: Microstructure Before and After Anodizationmentioning

confidence: 93%

“…So, the decreasing diameter could be caused by phase transformation of amorphous NT TiO2 to crystalline state in the coating layer as it was confirmed by the results of XRD and Raman spectroscopy. During annealing, the density of NT changes in relation with sintering and Several studies [1,3,6,15] confirmed that the as-anodized TiO 2 nanotubes are in amorphous state. However, when they are heat-treated at higher temperatures, the NTs crystallize to anatase phase or a mix of anatase and rutile phases.…”

Section: Microstructure Before and After Anodizationmentioning

confidence: 96%

“…Extremely fast development in nanotechnology is due to the unique properties of nanomaterials in a wide range of applications. Nowadays, great attention is paid to TiO 2 nanotubes (NT) [1][2][3], which have a huge potential for use in gas sensors, solar cells, photocatalytic, and also in medical applications. Current implants in biomedicine that are made from 316L stainless steel or Ti6Al4V alloy show an ever-increasing degree of negative reactions in the corrosive environment of the human body which subsequently affect not only the viability of the implanted material, but also causes serious complications of the patient's health.…”

Section: Introductionmentioning

confidence: 99%

“…Several methods of the anodization of Ti or Ti6Al4V substrates have been performed in aqueous, non-aqueous, or organic electrolytes, resulting in required morphological and geometric parameters of NT [1]. Various process parameters such as voltage, type, composition, and temperature of the electrolyte significantly affect the physical properties and morphology of TiO 2 NT.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Properties of Nanostructured Coating on Ti6Al4V

et al. 2020

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Implant surface properties of Ti6Al4V alloy that is currently used as a biocompatible material because of a variety of unique properties can be improved by a self-organized TiO2 layer. The TiO2 nanotubes forming on the titanium-based materials is a relatively recent technology for the surface properties modification and represents pronounced potential in promoting cell adhesion, proliferation, and differentiation that facilitate an implant osseointegration. This work focuses on the influence of surface treatment quality and anodic oxidation parameters on the structure features and properties of TiO2 nanotube coatings. The nanotubes were formed on Ti6Al4V alloy substrates by simultaneous surface oxidation and controlled dissolving of an oxide film in the presence of fluorine ions. The anodization process on ground or polished samples was performed at experimental condition of 30 V for 1 h. The selected anodized samples were heat treated for 2 h at 500 °C under flowing argon. All samples were characterized by scanning electron microscopy, X-ray diffraction analysis, and Raman spectroscopy. The corrosion rate in physiological solution reached 0.0043, 0.0182, and 0.0998 mm per year for the samples in polished and not-anodized, as-anodized, and anodized-heat treated conditions, respectively.

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Effect of fluoride and hydroxyl group on bioactivity of the anodized films prepared by two‐step anodization at low current density

Saenrang

Kashima

2022

Surface & Interface Analysis

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Titanium and its alloys are promising dental implant materials. In order to improve the bioactivity of the anodized films, the two‐step anodization was performed to produce the films. The steps were performed at 0.2 mA/cm2 for 30 min in electrolytes containing H3PO4/C2H5OH and H3PO4/C2H5OH/NH4F, respectively. The anodized films were soaked in a simulated body fluid (SBF). The effects of surface roughness, hydroxyl groups, fluoride, and hydrophilicity groups on the bioactivity were investigated and were found on the anodized films formed under two‐step anodization using 1 M H3PO4 + 80% V/V C2H5OH + 0.75 wt% NH4F. The bioactivity evaluation showed that the combination of two‐step anodization in NH4F as an electrolyte induced a formation of apatite on the anodized films. The surface roughness, hydroxyl groups, and fluoride formed on the hydrophilic anodized films are found to be responsible for the rapid formation of hydroxyapatite during SBF soaking. This will be useful in various biomedical applications especially in dental implant procedures.

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Tuning surface morphology and crystallinity of anodic TiO2 nanotubes and their response to biomimetic bone growth for implant applications

Cited by 33 publications

References 45 publications

Photofunctionalization of anodized titanium surfaces using UVA or UVC light and its effects against Streptococcus sanguinis

Photofunctionalization of anodized titanium surfaces using UVA or UVC light and its effects against Streptococcus sanguinis

Microstructure and Properties of Nanostructured Coating on Ti6Al4V

Effect of fluoride and hydroxyl group on bioactivity of the anodized films prepared by two‐step anodization at low current density

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