Gallium incorporation into phosphate based glasses: Bulk and thin film properties

Gallium incorporation into phosphate based glasses: Bulk and thin film properties

Publication Type:

Journal Article

Source:

Journal of the Mechanical Behavior of Biomedical Materials, Volume 82, p.371-382 (2018)

ISBN:

1751-6161

Abstract:

<p>The osteogenic ions Ca2+ P5+, Mg2+, and antimicrobial ion Ga3+ were homogenously dispersed into a 1.45 mu m thick phosphate glass coating by plasma assisted sputtering onto commercially pure grade titanium. The objective was to deliver therapeutic ions in orthopaedic/dental implants such as cementeless endoprostheses or dental screws. The hardness 4.7 GPa and elastic modulus 69.7 GPa, of the coating were comparable to plasma sprayed hydroxyapatite/dental enamel, whilst superseding femoral cortical bone. To investigate the manufacturing challenge of translation from a target to vapour condensed coating, structural/compositional properties of the target (P51MQ) were compared to the coating (P40PVD) and a melt-quenched equivalent (P40MQ). Following condensation from P51MQ to P40PVD, P2O5 content reduced from 48.9 to 40.5 mol%. This depoly-merisation and reduction in the P-O-P bridging oxygen content as determined by P-31 NMR, FTIR and Raman spectroscopy techniques was attributed to a decrease in the P2O5 network former and increases in alkali/alkali-earth cations. P40PVD appeared denser (3.47 vs. 2.70 g cm(-3)) and more polymerised than it&#39;s compositionally equivalent P40MQ, showing that structure/ mechanical properties were affected by manufacturing route.</p>