Influence of P2O5 on Thermal Behavior and Bioactivity of Sol-Gel Glasses

Abstract

Abstract: Two bioactive glasses in the system CaO-P₂O₅-SiO₂ were prepared by sol-gel process, from tetraethylorthosilicate
(TEOS), triethylphosphate (TEP) and hydrated calcium nitrate (one with P₂O₅ and the other P₂O₅ free). Thermal behavior and reaction mechanism of
xerogels were analyzed by TG-DTA methods. The in~ vitro bioactivity of both glasses was assessed by soaking them in simulated body fluid. The results
reveal that the presence of P₂O₅ in the glass composition gives rise to the change of thermal behavior: the organic groups of triethyl phosphate are
decomposed in the temperature range 300--420℃ and the residual OH groups are removed at 570℃ or so. The crystal of hydroxyl carbonate
apatite formed on the surface of the glass containing P₂O₅ is larger and, relatively, the bioactivity is improved.

Key words: sol-gel glasses, P₂O₅, DTA, bioactivity

CLC Number:

R318
TQ171

WANG Chuan-Hui,LI He-Jun,HUANG Feng-Ping,YANG Quan-Zu. Influence of P₂O₅ on Thermal Behavior and Bioactivity of Sol-Gel Glasses[J]. Journal of Inorganic Materials.

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Influence of P₂O₅ on Thermal Behavior and Bioactivity of Sol-Gel Glasses

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