Evidence of Nanometric-Sized Phosphate Clusters in Bioactive Glasses As Revealed by Solid-State 31P NMR

详细信息    查看全文

• 作者：Franck Fayon ; C茅dric Du茅e ; Thomas Poumeyrol ; Mathieu Allix ; Dominique Massiot
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：February 7, 2013
• 年：2013
• 卷：117
• 期：5
• 页码：2283-2288
• 全文大小：334K
• 年卷期：v.117,no.5(February 7, 2013)
• ISSN：1932-7455

文摘

Bioactive glasses are able to form strong bonds to bone. This property, crucial for medical applications, depends on the glass composition and structure. Dissolution of phosphates in melt-quenched silicate glasses raises the question of chemical homogeneity and possible formation of clusters. A detailed structural characterization of the bioactive glasses is thus highly desirable. In this work, the nature of the distribution of phosphate units in a melt-quenched bioactive glass is elucidated for the first time using ³¹P spin-counting solid-state NMR experiments. The structure of a dense bioactive calcium silicate glass with 2.6 mol % of phosphorus oxide is shown to exhibit nanometric-sized chemical and structural heterogeneities. Clear experimental evidence of the presence of phosphate clusters of five and six PO₄ tetrahedral units embedded in the disordered polymeric silicate network is given.