硼硅酸盐生物玻璃表面多层结构的形成机理(英文)

Formation Mechanism of Multilayered Structure on Surface of Bioactive Borosilicate Glass

描述了硼硅酸盐生物活性玻璃在体外含磷溶液中的转变过程,并采用XRD、SEM和EDS对反应产物的微观结构、形貌和成分进行了分析。结果显示,产物为多层结构,由羟基磷灰石和无定型SiO2层交替排列而成。此外,提出了一个定性模型来解释层状结构的形成机制。研究证实,反应动力学及反应产物的微观结构主要取决于生物活性玻璃的成分和含磷溶液的浓度。

A conversion process of a bioactive borosilicate glass to a multilayered structure in aqueous phosphate solution was described.Microstructure,morphology and composition of the reaction product were studied using XRD,SEM and EDS analysis.It was shown that a multilayered structure,consisting of alternating hydroxyapatite（HA） and amorphous SiO2 layers,was formed on the surface of the borosilicate glass.The formation mechanism of the multilayered microstructure was also suggested.Compared with previous work,it was indicated that conversion kinetics and microstructure development of conversion products mainly depended on the composition of the bioactive glass and the concentration of phosphate solution.