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首页> 外文期刊>European Journal of Glass Science and Technology, PartB. Physics and Chemistry of Glasses >Mechanisms for converting bioactive silicate, borate, and borosilicate glasses to hydroxyapatite in dilute phosphate solution
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Mechanisms for converting bioactive silicate, borate, and borosilicate glasses to hydroxyapatite in dilute phosphate solution

机译：在稀磷酸盐溶液中将生物活性硅酸盐，硼酸盐和硼硅酸盐玻璃转化为羟基磷灰石的机理

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摘要

The mechanisms by which a bioactive silicate glass (designated 45S5), a borate glass, and two intermediate borosilicate glass compositions convert to hydroxyapatite (HA) in dilute phosphate solutions were investigated. The borate and borosilicate glasses were derived from the silicate glass by fully or partially replacing the SiO_2 with B_2O_3. Kinetic, chemical and microstructural changes accompanying the conversion of the glasses to HA were comprehensively characterized. Increasing the B_2O_3 content of the glass produced an increase in the conversion rate and a decrease in the pH of the solution. The conversion started at the surface of the glass and moved inward. For particles with a size of 150-300 mum, conversion of the borate glass went to completion within 3 days, yielding pseudomorphic HA particles with a nanoscale structure, but the silicate and borosilicate glasses were only partially converted even after 75 days, giving a composite structure consisting of a SiO_2-rich core surrounded by a HA layer. Regardless of the composition, all the Na_2O and B_2O_3 present in the glass particles dissolved into solution, but the CaO either reacted to form HA or remained in the unconverted SiO_2-rich core. A qualitative model is developed to describe the conversion of the glasses to HA.
机译：研究了在稀磷酸盐溶液中生物活性硅酸盐玻璃（命名为45S5），硼酸盐玻璃和两种中间硼硅酸盐玻璃组合物转化为羟基磷灰石（HA）的机理。硼酸盐和硼硅酸盐玻璃是通过用B_2O_3完全或部分替代SiO_2而从硅酸盐玻璃衍生而来的。全面表征了伴随玻璃向HA转变的动力学，化学和微观结构变化。玻璃中B_2O_3含量的增加导致转化率的提高和溶液pH的降低。转换从玻璃表面开始并向内移动。对于尺寸为150-300微米的颗粒，硼酸盐玻璃的转化在3天内完成，得到具有纳米级结构的假晶HA颗粒，但硅酸盐和硼硅酸盐玻璃甚至在75天后也仅部分转化，从而形成复合材料。由被HA层包围的富含SiO_2的核组成的结构。无论组成如何，玻璃颗粒中存在的所有Na_2O和B_2O_3都溶解在溶液中，但是CaO要么反应形成HA，要么保留在未转化的富含SiO_2的核中。建立了定性模型来描述眼镜向HA的转化。

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