Diffusive processes in aqueous glass dissolution

Diffusive processes in aqueous glass dissolution
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水玻璃溶解中的扩散过程

DOI:
10.1038/s41529-019-0102-5
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发表时间:
2019
影响因子:
5.1
通讯作者:
Goût T
Goût T
中科院分区:
材料科学1区
文献类型:
--
作者:
Goût T

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高放射性核废料通常被固定在硼硅酸盐玻璃中进行处置。然而,这种玻璃与水溶液接触时会腐蚀。要预测放射性核素从废物中的释放,必须了解它们的溶解机制。理解玻璃溶解机制是许多其他学科的挑战,许多玻璃溶解模型仍然相互矛盾。在这里,我们表明,扩散是一个重要的过程,在后期的溶解简化的废玻璃,但没有明显的初期阶段的溶解。溶液中没有可测量的同位素分馏最初支持一致溶解模型。然而,溶液在后来变得更轻的同位素证明了扩散的同位素分馏作用,并反对将扩散输送排除为重要机制的模型。这里概述的定期采样的同位素方法提供了一个额外的维度,用于了解玻璃的溶解机制,而不仅仅是通常的溶液浓度测量和后处理,对蚀变玻璃的纳米级分析。
High level nuclear waste is often immobilised in a borosilicate glass for disposal. However, this glass corrodes in contact with aqueous solutions. To predict radionuclide releases from wasteforms, their dissolution mechanisms must be understood. Understanding glass dissolution mechanisms presents a challenge across numerous other disciplines and many glass dissolution models still remain conflicted. Here we show that diffusion was a significant process during the later stages of dissolution of a simplified waste glass but was not evidenced during the initial stages of dissolution. The absence of measurable isotopic fractionation in solution initially supports models of congruent dissolution. However, the solution becoming isotopically lighter at later times evidences diffusive isotopic fractionation and opposes models that exclude diffusive transport as a significant mechanism. The periodically sampled isotopic methodologies outlined here provide an additional dimension with which to understand glass dissolution mechanisms beyond the usual measurement of solution concentrations and, post-process, nano-scale analysis of the altered glass.
DOI: 10.1016/j.gca.2019.02.015
发表时间: 2019-04
影响因子: 5
作者:
R. Hindshaw;Rebecca Tosca;Thomas L. Goût;I. Farnan;N. Tosca;E. Tipper
通讯作者: R. Hindshaw;Rebecca Tosca;Thomas L. Goût;I. Farnan;N. Tosca;E. Tipper
DOI: 10.1016/j.gca.2015.02.039
发表时间: 2015-06-01
影响因子: 5
作者:
Geisler, Thorsten;Nagel, Thorsten;Nemchin, Alexander A.
通讯作者: Nemchin, Alexander A.
玻璃中碱离子和水合氢离子的相互扩散:部分电离
DOI: --
发表时间: 1982
期刊:
影响因子: --
作者:
R. Doremus
通讯作者: R. Doremus
DOI: 10.1016/j.jnoncrysol.2018.03.002
发表时间: 2018-10
影响因子: 3.5
作者:
Rui Guo;C. Brigden;S. Gin;S. Swanton;I. Farnan
通讯作者: Rui Guo;C. Brigden;S. Gin;S. Swanton;I. Farnan
DOI: 10.1016/0022-3093(75)90079-4
发表时间: 1975-01-01
影响因子: 3.5
作者:
DOREMUS, RH
通讯作者: DOREMUS, RH