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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Fluoride-containing bioactive glasses: Fluoride loss during melting and ion release in tris buffer solution
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Fluoride-containing bioactive glasses: Fluoride loss during melting and ion release in tris buffer solution

机译：含氟生物活性玻璃：融化过程中的氟化物损失和tris缓冲溶液中的离子释放

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摘要

Melt-derived bioactive glasses (SiO_2-P_2O _5-CaO-Na_2O-CaF_2; CaF_2 0 to 17.76 mol%) lost fluoride during melting, but nominal and analysed CaF_2 contents in the glass correlated linearly. Analysed CaO contents were increased, showing that fluoride was lost as hydrofluoric acid after reaction with atmospheric water during melting. Weight loss on ignition reduced linearly with increasing CaF_2, suggesting that CaF_2 impedes absorption of atmospheric water. pH changes in tris buffer solution showed that pH is controlled by the silicate matrix (via ion exchange processes), and fluoride release contributes less to the overall pH. Glasses formed apatite in tris buffer; phosphate concentration of the glass was the limiting factor, resulting in fluorite formation for increasing fluoride content in the glass and calcite formation for the fluoride-free composition. These results allow for tailoring of novel fluoride-containing bioactive glasses to address specific needs, particularly in dentistry and for remineralising toothpastes.
机译：熔融衍生的生物活性玻璃（SiO_2-P_2O _5-CaO-Na_2O-CaF_2; CaF_2 0至17.76 mol％）在熔融过程中损失了氟化物，但玻璃中标称和分析的CaF_2含量呈线性相关。分析的CaO含量增加，表明在熔融过程中与大气水反应后，氟化物作为氢氟酸损失掉了。点火失重随CaF_2的增加呈线性减少，表明CaF_2阻碍了大气水分的吸收。 tris缓冲溶液中的pH值变化表明，pH值受硅酸盐基质控制（通过离子交换过程），而氟化物的释放对总pH值的贡献较小。玻璃在Tris缓冲液中形成磷灰石。玻璃中磷酸盐的浓度是限制因素，导致萤石形成，从而增加了玻璃中的氟化物含量，而方解石的形成对于无氟化物的组合物而言。这些结果使得能够定制新颖的含氟生物活性玻璃以满足特定的需求，特别是在牙科领域和牙膏的再矿化。

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