A thermodynamic discourse on the dissolution behavior of bioactive glasses

Q1 Materials Science

Biomedical Glasses Pub Date : 2016-01-14 DOI:10.1515/bglass-2016-0010

Barbara Pföss, R. Conradt

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Abstract

Abstract The interaction between bioactive glass and body fluid is crucial for the special properties of this material, therefore a large number of experimental data is available in literature. However, a frame for systematic interpretation of these results in terms of understanding the mechanisms at the interface between glass and body medium and the relation between glass composition and dissolution behavior is still missing. For two multicomponent bioactive glasses, 45S5 and 13-93, the Gibbs energies of the glassy material on one side and their aqueous system on the other side were calculated individually. The difference between solid material and aqueous system further constitutes the pH dependent Gibbs energy of hydration, ∆Ghydr. The impact of glass compositions and glassy or crystalline state on ∆Ghydr is demonstrated referring to chemical durability. Along considerations regarding the aqueous system, the thermodynamic calculations proof the precipitation of hydroxyapatite inwater and simulated body fluid for a systemcontaining P2O5 and Ca2+. In the course of deriving the Gibbs energies for bioactive glass compositions via constitutional compounds, bioactive behavior is discussed from the point of coexisting equilibrium phases in the system of Na2O-CaO-SiO2.

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生物活性玻璃溶解行为的热力学论述

生物活性玻璃与体液的相互作用是这种材料特殊性能的关键，因此文献中有大量的实验数据。然而，从了解玻璃与体介质界面的机制以及玻璃成分与溶解行为之间的关系方面，仍然缺乏一个系统解释这些结果的框架。对于45S5和13-93两种多组分生物活性玻璃，分别计算了一侧玻璃材料和另一侧水体系的吉布斯能。固体物质与水体系之间的差异进一步构成了依赖pH的水化吉布斯能∆Ghydr。玻璃成分和玻璃态或结晶态对∆Ghydr的影响参照化学耐久性进行论证。考虑到水系统，热力学计算证明了羟基磷灰石在水中的沉淀和模拟体液中含有P2O5和Ca2+的系统。在通过组成化合物推导生物活性玻璃组合物的吉布斯能的过程中，从na20 - cao - sio2体系中共存平衡相的角度讨论了生物活性行为。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Biomedical Glasses Materials Science-Surfaces, Coatings and Films

自引率

0.00%

发文量

审稿时长

17 weeks

期刊介绍： Biomedical Glasses is an international Open Access-only journal covering the field of glasses for biomedical applications. The scope of the journal covers the science and technology of glasses and glass-based materials intended for applications in medicine and dentistry. It includes: Chemistry, physics, structure, design and characterization of biomedical glasses Surface science and interactions of biomedical glasses with aqueous and biological media Modeling structure and reactivity of biomedical glasses and their interfaces Biocompatibility of biomedical glasses Processing of biomedical glasses to achieve specific forms and functionality Biomedical glass coatings and composites In vitro and in vivo evaluation of biomedical glasses Glasses and glass-ceramics in engineered regeneration of tissues and organs Glass-based devices for medical and dental applications Application of glasses and glass-ceramics in healthcare.