Dissolution behaviour of a polyphosphate glass in simulated body fluid

Jelena D. Nikolić, Mihajlo B. Tošić, Snežana R. Grujić, Vladimir D. Živanović, Marija S. Đošić, Srđan D. Matijašević, Sonja V. Smiljanić


In this work, the dissolution behavior of polyphosphate glass, with the composition of 45P2O5·3SiO2·25K2O·15CaO·10MgO·1ZnO·1MnO (mol%), in simulated body fluid (SBF) at the temperature of 37ºC for different time was studied. Two powder classes of glass (granulation: 0.1 - 0.3 and 0.3 - 0.65 mm) and the bulk of glass were investigated. The dissolution experiments were conducted under the static conditions. Changes in normalized mass release, normalized ions concentration, pH values, and surface morfology were determined as a function of dissolution time. Initial rates of glass powder dissolution and ions leaching as well as the diffusion coefficient of cations and the releasing rate of ions during the hydrolysis process of glass were determined. It was shown that investigated phosphate glass dissolves in SBF incongruently, with neither precipitation nor formation of newly potentially toxic compounds, for the dissolution period of 720h.


biophosphate glass; leaching; kinetics; mechanism

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DOI: https://doi.org/10.2298/JSC161031009N


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