Sodium-free mixed alkali bioactive glasses

Q1 Materials Science
D. Brauer, R. Brückner, M. Tylkowski, L. Hupa
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引用次数: 17

Abstract

Abstract Two sodium-free mixed alkali series of bioactive glasses based on compositions Bioglass 45S5 and ICIE1, containing lithium and/or potassium as alkali ions, were prepared by a melt-quench route. Thermal properties showed the well-known mixed alkali effect, with glass transition and crystallisation temperatures and the coefficient of thermal expansion going either through a minimum or a maximum for the mixed alkali composition, resulting in a wider processing window. Ion release, by contrast, was controlled by the modifier ionic radius, with ion release rates in dynamic and static dissolution studies increasing for potassium-substituted glasses compared to the composition containing lithium as the only alkali ion. This was caused by pronounced changes in oxygen packing density and molar volume of the glasses owing to the differences in ionic radii (76 pm for Li+ and 138 pm for K+). Partially substituting one alkali for another therefore helps to improve high temperature processing of bioactive glasses and can also be used to control or tailor ion release.
无钠混合碱生物活性玻璃
摘要:以Bioglass 45S5和ICIE1为原料,以锂和/或钾为碱离子,采用熔淬法制备了两种无钠混合碱系列生物活性玻璃。热性能表现出众所周知的混合碱效应,对于混合碱成分,玻璃化转变和结晶温度以及热膨胀系数要么最小要么最大,从而导致更宽的加工窗口。相比之下,离子释放受离子半径调节剂的控制,在动态和静态溶解研究中,与含锂作为唯一碱离子的组合物相比,钾取代玻璃的离子释放率增加。这是由于离子半径(Li+为76 pm, K+为138 pm)的差异导致玻璃的氧堆积密度和摩尔体积的显著变化造成的。因此,用一种碱代替另一种碱有助于改善生物活性玻璃的高温处理,也可用于控制或调整离子释放。
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来源期刊
Biomedical Glasses
Biomedical Glasses Materials Science-Surfaces, Coatings and Films
自引率
0.00%
发文量
0
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.
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