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Effects of nitrogen on properties of oxyfluoronitride bioglasses ☆

Paper ID Volume ID Publish Year Pages File Format Full-Text
34851 45052 2013 7 PDF Available
Title
Effects of nitrogen on properties of oxyfluoronitride bioglasses ☆
Abstract

Bioglasses are used as bone substitutes and prosthetic coatings. Following implantation, they are predisposed to generate a series of physicochemical reactions at the glass-bone interface. Bioglasses with molar composition: 55SiO2–8.5CaO–31.5Na2O–5CaF2 have been synthesized and characterized. However, because of their poor strength, doping with nitrogen was performed on these glasses to increase their mechanical properties. These glasses were chemically analyzed to verify the amount of nitrogen introduced and structurally characterized by 29Si and 19F MAS NMR. The fluorine complexes with calcium and sodium and is present as mixed calcium sodium fluoride and sodium fluoride species. The addition of fluorine to bioglasses reduces the melting temperature which helps to minimize nitrogen loss and bubble formation. So the fluorine facilitates the dissolution of nitrogen into the melt. Nitrogen substitutes for oxygen in the silicate network and is present as SiO3N and SiO2N2 structural units. The density, glass transition temperature, Young's modulus, hardness and fracture toughness all increase with the content of nitrogen introduced into the glasses. These changes are a result of greater cross-linking of the silicate network due to the higher coordination of nitrogen compared to oxygen.

► Bioglasses are used such as bone substitutes. ► Doping with nitrogen of oxyfluoronitride glasses allows to increase the mechanical properties. ► Nitrogen substitutes for oxygen in the glass network as SiO3N and SiO2N2 units. ► SiO3N and SiO2N2 units are responsible for improving the properties mechanical.

Keywords
Bioglass; Oxyfluoronitride glass; Physical properties; Mechanical properties; Structure
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Effects of nitrogen on properties of oxyfluoronitride bioglasses ☆
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 48, Issue 1, January 2013, Pages 89–95
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us