Nd:YAG (532 nm) pulsed laser deposition produces crystalline hydroxyapatite thin coatings at room temperature

Gomes, G.C.; Borghi, Fabricio Frizera; Ospina, Rogelio; López, Elvis O.; Borges, Felipe Azevedo; Mello, Alexandre

doi:10.1016/j.surfcoat.2017.09.008

Cited by 108 publications

(72 citation statements)

References 47 publications

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“…P 2p envelope was fitted with two peaks. As presented, the binding energy found at 132.9 eV into the P 2p envelope reinforces that PO 4 3− groups were present on the surface of the different films [36,[59][60][61][62] . On the mmmSr spectra, P 2p and Sr 3d peaks overlapped around 134/135 eV, and the Sr 3d 5/2 component detected at 133.8 eV might be assigned to strontium carbonate (SrCO 3 ) species, due to further oxidation of the metallic strontium with exposure to air [25,63].…”

Section: Surface Characterizationsupporting

confidence: 76%

“…In Fig. 2c, high-energy resolution analysis of individual peaks for Ca 2p are presented, where the significant contributions at 347.0 and 346.8 eV for CaP and mmmSr groups could be attributed to the presence of CaCO 3 compounds, as well as Ca-O compounds [36,[59][60][61]64]. It is also suggested that the minor Ca 2p 3/2 contributions at 345.5 and 345.0 eV for CaP and mmmSr groups, respectively, corresponded to metallic Ca species [59,65] .…”

Section: Surface Characterizationmentioning

confidence: 99%

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TiO2 bioactive implant surfaces doped with specific amount of Sr modulate mineralization

Costa

Gemini-Piperni

Alves

et al. 2021

Materials Science and Engineering: C

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One of the main problems that remain in the implant industry is poor osseointegration due to bioinertness of implants. In order to promote bioactivity, calcium (Ca), phosphorus (P) and strontium (Sr) were incorporated into a TiO 2 porous layer produced by micro-arc oxidation. Ca and P as bioactive elements are already well reported in the literature, however, the knowledge of the effect of Sr is still limited. In the present work, the effect of various amounts of Sr was evaluated and the morphology, chemical composition and crystal structure of the oxide layer were investigated. Furthermore, in vitro studies were carried out using human osteoblast-like cells.The oxide layer formed showed a triplex structure, where higher incorporation of Sr increased Ca/P ratio, amount of rutile and promoted the formation of SrTiO 3 compound. Biological tests revealed that lower concentrations of Sr did not compromise initial cell adhesion neither viability and interestingly improved mineralization. However, higher concentration of Sr (and consequent higher amount of rutile) showed to induce collagen secretion but with compromised mineralization, possibly due to a delayed mineralization process or induced precipitation of deficient hydroxyapatite. Ca-P-TiO 2 porous layer with less concentration of Sr seems to be an ideal candidate for bone implants.

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Section: Surface Characterizationsupporting

confidence: 76%

Section: Surface Characterizationmentioning

confidence: 99%

TiO2 bioactive implant surfaces doped with specific amount of Sr modulate mineralization

Costa

Gemini-Piperni

Alves

et al. 2021

Materials Science and Engineering: C

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“…Finally, the signal at 288.48-288.76 eV can be associated to carbonates (38), as expected (15). In the oxygen region, two contributions are observed on H (Figure 7d) at 530.74 eV and 532.02 eV, which can be respectively associated to O in phosphates and hydroxyl groups (39). Three contributions can be observed in the oxygen region of the B sample (Figure 7l): 531.21 eV, 532.48 eV and 535.21 eV.…”

Section: Accepted Articlesupporting

confidence: 56%

Surface functionalization of bioactive glasses and hydroxyapatite with polyphenols from organic red grape pomace

et al. 2021

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An extract of polyphenols was obtained from organic red grape pomace, chemically analyzed and used for functionalization of two bioactive glasses and porous hydroxyapatite. Functionalization is effective on hydroxyapatite and on the bioactive glass with higher surface reactivity with a different grafting mechanism.Grafting does not inhibit redox and radical scavenging activity of polyphenols. The grafted polyphenols make a continuous layer with an almost complete surface coverage. Polyphenols are released with different kinetics Accepted ArticleThis article is protected by copyright. All rights reserved according to the mechanism of grafting and maintain their redox activity. A homogeneous thin layer of polyphenols is still firmly grafted on both substrates after 28 days of soaking and it still maintains radical scavenging activity. The functionalized samples can be sterilized by gamma irradiation.

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“…In recent years, there has been an increasing amount of research on the process of laser ablation because of its wide applications in pulsed laser deposition [1], laser hardening [2], laser polished surfaces [3], laser materials processing [4], laser-induced breakdown spectroscopy [5] and pulsed laser ablation propulsion [6]. Among these applications, pulsed laser ablation propulsion (LAP) shows potential solutions for some space fields of growing importance, such as space debris removal [7], laser ablation micro-thrusters for orbit and attitude control of nano-satellites [8], and the despinning of non-cooperative space objectives remotely [9].…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Impulse Coupling Characteristics and Plasma Plume Dynamics of a Nanosecond Pulsed Laser Irradiated Aluminum Target

Zhou

Chang

et al. 2020

IEEE Access

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Nd:YAG (532 nm) pulsed laser deposition produces crystalline hydroxyapatite thin coatings at room temperature

Cited by 108 publications

References 47 publications

TiO2 bioactive implant surfaces doped with specific amount of Sr modulate mineralization

TiO2 bioactive implant surfaces doped with specific amount of Sr modulate mineralization

Surface functionalization of bioactive glasses and hydroxyapatite with polyphenols from organic red grape pomace

Experimental Research on Impulse Coupling Characteristics and Plasma Plume Dynamics of a Nanosecond Pulsed Laser Irradiated Aluminum Target

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