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The deposition of strontium and zinc Co-substituted hydroxyapatite coatings

  • Biomaterials Synthesis and Characterization
  • Original Research
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Abstract

The in vitro and in vivo performance of hydroxyapatite (HAp) coatings can be modified by the addition of different trace ions, such as silicon (Si), lithium (Li), magnesium (Mg), zinc (Zn) or strontium (Sr) into the HAp lattice, to more closely mirror the complex chemistry of human bone. To date, most of the work in the literature has considered single ion-substituted materials and coatings, with limited reports on co-substituted calcium phosphate systems. The aim of this study was to investigate the potential of radio frequency magnetron sputtering to deposit Sr and Zn co-substituted HAp coatings using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The FTIR and XPS results highlight that all of the Sr, Zn and Sr-Zn co-substituted surfaces produced are all dehydroxylated and are calcium deficient. All of the coatings contained HPO4 2− groups, however; only the pure HAp coating and the Sr substituted HAp coating contained additional CO3 2− groups. The XRD results highlight that none of the coatings produced in this study contain any other impurity CaP phases, showing peaks corresponding to that of ICDD file #01-072-1243 for HAp, albeit shifted to lower 2θ values due to the incorporation of Sr into the HAp lattice for Ca (in the Sr and Sr-Zn co-substituted surfaces only). Therefore, the results here clearly show that RF magnetron sputtering offers a simple means to deliver Sr and Zn co-substituted HAp coatings with enhanced surface properties.

Graphical Abstract

(a) XRD patterns for RF magnetron sputter deposited hydroxyapatite coatings and (b)-(d) for Sr, Zn and Sr-Zn co-substituted coatings, respectively. The XPS spectra in (b) confirms the presence of a HA sputter deposited coating as opposed to (c) XPS spectra for a Sr-Zn co-substituted sputter deposited coating.

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Acknowledgements

This work has been supported by the National Research Programme No. 2014.10-4/VPP-3/21 “Multifunctional materials and composites, photonics and nanotechnology (IMIS2)” Project No. 4 “Nanomaterials and nanotechnologies for medical applications”. The authors would also like to acknowledge the PhD funding provided by of the Department of Employment and Learning (Northern Ireland).

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  1. Nanotechnology and Integrated Bioengineering Centre (NIBEC), School of Engineering, University of Ulster, Shore Road, Newtownabbey, Co. Antrim, BT37 0QB, Northern Ireland, UK

    L. Robinson, B. J. Meenan & A. R. Boyd

  2. Rudolfs Cimdins Riga Biomaterials Innovations and Development Centre of RTU, Institute of General Chemical Engineering, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Pulka 3, Riga, LV, 1007, Latvia

    K. Salma-Ancane & L. Stipniece

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Robinson, L., Salma-Ancane, K., Stipniece, L. et al. The deposition of strontium and zinc Co-substituted hydroxyapatite coatings. J Mater Sci: Mater Med 28, 51 (2017). https://doi.org/10.1007/s10856-017-5846-2

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