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Degradation and Characterization of Resorbable Phosphate-Based Glass Thin-Film Coatings Applied by Radio-Frequency Magnetron Sputtering

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    Research Article

    Degradation and Characterization of Resorbable Phosphate-Based Glass Thin-Film Coatings Applied by Radio-Frequency Magnetron Sputtering
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    Department of Mechanical, Materials and Manufacturing Engineering, University of Nottingham, Nottingham NG7 2RD, United Kingdom
    *E-mail: [email protected]
    *E-mail: [email protected]
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    ACS Applied Materials & Interfaces

    Cite this: ACS Appl. Mater. Interfaces 2015, 7, 49, 27362–27372
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    https://doi.org/10.1021/acsami.5b08957
    Published November 2, 2015
    Copyright © 2015 American Chemical Society
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    Abstract

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    Quinternary phosphate-based glasses of up to 2.67 μm, deposited by radio-frequency magnetron sputtering, were degraded in distilled water and phosphate-buffered saline (PBS) to investigate their degradation characteristics. Magnetron-sputtered coatings have been structurally compared to their compositionally equivalent melt-quenched bulk glass counterparts. The coatings were found to have structurally variable surfaces to melt-quenched glass such that the respective bridging oxygen to nonbridging oxygen bonds were 34.2% to 65.8% versus 20.5% to 79.5%, forming metaphosphate (PO3)− (Q2) versus less soluble (P2O7)4– (Q1) and (PO4)3– (Q0), respectively. This factor led to highly soluble coatings, exhibiting a t1/2 degradation dependence in the first 2 h in distilled water, followed by a more characteristic linear profile because the subsequent layers were less soluble. Degradation was observed to preferentially occur, forming voids characteristic of pitting corrosion, which was confirmed by the use of a focused ion beam. Coating degradation in PBS precipitated a (PO3)− metaphosphate, an X-ray amorphous layer, which remained adherent to the substrate and seemingly formed a protective diffusion barrier, which inhibited further coating degradation. The implications are that while compositionally similar, sputter-deposited coatings and melt-quenched glasses are structurally dissimilar, most notably, with regard to the surface layer. This factor has been attributed to surface etching of the as-deposited coating layer during deposition and variation in the thermal history between the processes of magnetron sputtering and melt quenching.

    Copyright © 2015 American Chemical Society

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    Cited By

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    This article is cited by 16 publications.

    1. A. C. Popa, G. E. Stan, C. Besleaga, L. Ion, V. A. Maraloiu, D. U. Tulyaganov, and J. M. F. Ferreira . Submicrometer Hollow Bioglass Cones Deposited by Radio Frequency Magnetron Sputtering: Formation Mechanism, Properties, and Prospective Biomedical Applications. ACS Applied Materials & Interfaces 2016, 8 (7) , 4357-4367. https://doi.org/10.1021/acsami.6b00606
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    15. Bryan W. Stuart, Jeremy J. Titman, Miquel Gimeno-Fabra, Ifty Ahmed, David M. Grant. Insights into structural characterisation and thermal properties of compositionally equivalent vapour-condensed and melt-quenched glasses. Materials & Design 2016, 111 , 174-184. https://doi.org/10.1016/j.matdes.2016.08.063
    16. N Mihailescu, George E Stan, C Ristoscu, M Sopronyi, Ion N Mihailescu. Bioactive glass thin films synthesized by advanced pulsed laser techniques. Journal of Physics: Conference Series 2016, 764 , 012020. https://doi.org/10.1088/1742-6596/764/1/012020
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    ACS Applied Materials & Interfaces

    Cite this: ACS Appl. Mater. Interfaces 2015, 7, 49, 27362–27372
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsami.5b08957
    Published November 2, 2015
    Copyright © 2015 American Chemical Society
    Request reuse permissions

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