Gallium incorporation into phosphate based glasses: Bulk and thin film properties.
J Mech Behav Biomed Mater
; 82: 371-382, 2018 06.
Article
em En
| MEDLINE
| ID: mdl-29656232
ABSTRACT
The osteogenic ions Ca2+, P5+, Mg2+, and antimicrobial ion Ga3+ were homogenously dispersed into a 1.45⯵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 4.7â¯GPa and elastic modulus 69.7â¯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 40.5â¯mol%. This depolymerisation and reduction in the P-O-P bridging oxygen content as determined by 31P 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. 2.70â¯gâ¯cm-3) and more polymerised than it's compositionally equivalent P40MQ, showing that structure/ mechanical properties were affected by manufacturing route.
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Coleções:
01-internacional
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MEDLINE
Assunto principal:
Fosfatos
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Teste de Materiais
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Fenômenos Mecânicos
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Gálio
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Vidro
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article