Dissolution kinetics of a sodium borosilicate glass in Tris buffer solutions: impact of Tris concentration and acid (HCl/HNO 3 ) identity
Dissolution kinetics of a sodium borosilicate glass in Tris buffer solutions: impact of Tris concentration and acid (HCl/HNO 3 ) identity
复制标题
硼硅酸钠玻璃在 Tris 缓冲溶液中的溶解动力学：Tris 浓度和酸 (HCl/HNO 3 ) 特性的影响
DOI：
10.1039/d0cp06425d
复制
发表时间：
2021
影响因子：
3.3
通讯作者：
Goel, Ashutosh
中科院分区：
文献类型：
--
作者：
Stone-Weiss, Nicholas;Smith, Nicholas J.;Youngman, Randall E.;Pierce, Eric M.;Goel, Ashutosh
了解玻璃在近中性环境中的腐蚀行为对于许多技术至关重要，包括用于再生医学和核废料固定的玻璃。为了在整个实验过程中保持 pH = 7 至 9 范围内的 pH 值一致，ISO 标准 10993-14 和 23317 中建议使用含有三（羟甲基）氨基甲烷（“Tris”，有时称为 THAM）的缓冲溶液来评估生物材料降解，并在整个玻璃溶解行为文献中使用 - 一个关键优点是不存在溶解的碱金属/碱土金属阳离子（即 Na+ 或 Ca2+），这些阳离子会因溶液反馈而使实验结果变得复杂。影响。尽管 Tris 可有效维持溶液 pH 值，但由于在研究玻璃腐蚀（尤其是硼硅酸盐玻璃）时它会产生不利的人为影响，因此引起了人们的担忧。因此，关于硼硅酸盐玻璃与基于 Tris 的解决方案的相互作用，仍然存在许多悬而未决的问题。我们通过研究硼硅酸钠玻璃在多种 Tris 基溶液中的溶解行为来探讨这一主题，温度为 65 °C，具有不同的酸特性（Tris-HCl 与 Tris-HNO3）、缓冲液浓度（0.01 M 至 0.5 M）和 pH（7-9）。参考之前关于该主题的研究对结果进行了讨论，并得出以下结论：(i) Tris 基溶液中的酸特性对硼硅酸盐玻璃的溶解行为没有表现出显着影响，(ii) ~0.1 M Tris 基溶液是在没有明显不良溶液化学效应的情况下维持溶液 pH 值的理想选择，(iii) 由于玻璃溶解过程，Tris-硼络合物可以在溶液中形成。然而，复杂的形成表现出明显的温度依赖性，需要进一步研究以揭示 Tris 基溶液影响硼硅酸盐玻璃溶解行为的精确机制。
Understanding the corrosion behavior of glasses in near-neutral environments is crucial for many technologies including glasses for regenerative medicine and nuclear waste immobilization. To maintain consistent pH values throughout experiments in the pH = 7 to 9 regime, buffer solutions containing tris(hydroxymethyl)aminomethane (“Tris”, or sometimes called THAM) are recommended in ISO standards 10993-14 and 23317 for evaluating biomaterial degradation and utilized throughout glass dissolution behavior literature—a key advantage being the absence of dissolved alkali/alkaline earth cations (i.e. Na+ or Ca2+) that can convolute experimental results due to solution feedback effects. Although Tris is effective at maintaining the solution pH, it has presented concerns due to the adverse artificial effects it produces while studying glass corrosion, especially in borosilicate glasses. Therefore, many open questions still remain on the topic of borosilicate glass interaction with Tris-based solutions. We have approached this topic by studying the dissolution behavior of a sodium borosilicate glass in a wide range of Tris-based solutions at 65 °C with varied acid identity (Tris–HCl vs. Tris–HNO3), buffer concentration (0.01 M to 0.5 M), and pH (7–9). The results have been discussed in reference to previous studies on this topic and the following conclusions have been made: (i) acid identity in Tris-based solutions does not exhibit a significant impact on the dissolution behavior of borosilicate glasses, (ii) ∼0.1 M Tris-based solutions are ideal for maintaining solution pH in the absence of obvious undesirable solution chemistry effects, and (iii) Tris–boron complexes can form in solution as a result of glass dissolution processes. The complex formation, however, exhibits a distinct temperature-dependence, and requires further study to uncover the precise mechanisms by which Tris-based solutions impact borosilicate glass dissolution behavior.