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Catalysis, nanostructure and macroscopic property triangle in bioactive calcium-containing ceramic systems

Authors
Journal
Materials Science and Engineering C
0928-4931
Publisher
Elsevier
Publication Date
Volume
33
Issue
3
Identifiers
DOI: 10.1016/j.msec.2012.12.038
Keywords
  • Calcium Silicate
  • Bioceramic
  • Solubility
  • Hardness
  • Sem
  • Sol–Gel Process
Disciplines
  • Chemistry
  • Medicine

Abstract

Abstract Calcium silicate ceramics are intended for application as long-term implant materials. In the present work, attention was paid to understand the correlations between the nanostructure (aggregate size, crystallinity, porosity) and the macroscopic properties (solubility in water and simulated body fluids, SBF; hardness) varying the chemical composition. Varying the catalyst (from a base to various acids) during the chemical synthesis was shown to significantly impact on the pore size, crystallinity and mechanical properties. The basic catalyst yields the ceramics with the highest mechanical strength. Ammonia used in 1.0 or 10.0 molar ratio results in bulk ceramics with parameters required for a biomedical application, good hardness (180–200 HV) and low solubility (1–3%) in water and in SBF. The fine porosity (~50nm) and homogeneous amorphous structure induce good mechanical character.

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