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Effect of pH and ionic strength on the reactivity of Bioglass® 45S5

Paper ID Volume ID Publish Year Pages File Format Full-Text
12358 791 2005 10 PDF Available
Title
Effect of pH and ionic strength on the reactivity of Bioglass® 45S5
Abstract

Bioglass® 45S5 is a silica-based melt-derived glass, used in medical field as a bone regenerative material because of the deposition of a layer of hydroxy carbonate apatite (HCA) on the surface of the glass when immersed in body fluid.The present paper studies the early steps of reaction of 2-μm sized particles of Bioglass®, in solutions buffered with TRIS at different pH, by means of ICP-ES and FTIR spectroscopy. Only at pH 8 could a total reconstruction of the glass be observed, with the formation of both a silica and a calcium phosphate rich layers. At higher pH, selective dissolution of the glass was hindered by the immediate precipitation of a layer of calcium phosphate, whereas at lower pH a total breakdown of the glass occurred and no calcium phosphate precipitation was noted. The use of the ATR-liquid cell allowed the observation of the reaction in real time, and this showed that the process of silica formation is not separable from cation leaching from the glass, as well as the formation of the calcium phosphate rich layer.

Keywords
Bioactive glass; Micron-size particles; TRIS dissolution; FTIR-ATR; ICP-ES
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Effect of pH and ionic strength on the reactivity of Bioglass® 45S5
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 26, Issue 14, May 2005, Pages 1665–1674
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