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Early Stages of Calcium Phosphate Formation on Bioactive Borosilicate Glass in Aqueous Phosphate Solution
Author(s) -
Li Yadong,
Rahaman Mohamed N.,
Bal B. Sonny,
Day Delbert E.,
Fu Qiang
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.02140.x
Subject(s) - brushite , aqueous solution , borosilicate glass , phosphate , scanning electron microscope , precipitation , calcium , materials science , fourier transform infrared spectroscopy , calcium silicate , chemical engineering , nuclear chemistry , mineralogy , chemistry , inorganic chemistry , organic chemistry , composite material , metallurgy , physics , meteorology , engineering
The conversion of bioactive glass to a calcium phosphate material, typically hydroxyapatite (HA), by solution–precipitation reactions in aqueous phosphate solution, has been commonly reported. This paper describes the structural and compositional characteristics of the calcium phosphate material formed during the early‐stage conversion (<5 h) of a borosilicate glass (designated H12) in aqueous phosphate solution. Disks of H12 glass were reacted with 0.25 M K 2 HPO 4 solution with a starting pH=7.0 at 37°C. The structure and composition of the product layer were characterized using thin film X‐ray diffraction, scanning electron microscopy, and Fourier transform infrared reflectance spectroscopy. For reaction times <5 h, the results indicated the formation of brushite (CaHPO 4 ·2H 2 O) with coarse, plate‐like crystals. In comparison, the formation of HA with small needle‐like crystals was found at later times. This early‐stage formation of brushite has not been reported in previous studies of converting bioactive silicate and borate glasses in aqueous phosphate solution.