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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 >Effect of surface roughness on medieval-type glass alteration in aqueous medium
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Effect of surface roughness on medieval-type glass alteration in aqueous medium

机译：表面粗糙度对水性介质中世纪玻璃改变的影响

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摘要

Determination of the glass alteration rate requires the knowledge of the reactive surface area that is a key parameter. Many studies have evaluated this parameter for glass monoliths or powders by using either geometrical or BET surface area, but few have focused on the impact of glass roughness on the reactive surface area and on the global alteration. The roughness can be expected to proportionally increase the reactive surface area and to modify local conditions of alteration. Therefore, the aim of this study is to evaluate the impact of surface roughness and asperities on the alteration of a model medieval-type glass. Experiments were performed in aqueous medium on samples with different initial surface roughness level. The results show that, for an initially smooth surface, the altered layer is continuous and tends to scale, whereas for an initially rough surface, the alteration is heterogeneous in morphology and composition and asperities are highly hollowed. Surprisingly, despite these differences, the quantity of altered glass is relatively similar, which shows that the roughness does not significantly increase the reactive surface area. This is explained by a fast solution saturation in asperities that minimizes their contribution to the global alteration.
机译：玻璃改变率的测定需要了解作为关键参数的反应性表面积。许多研究通过使用几何或BET表面积评估了玻璃整料或粉末的该参数，但很少有少数集中在反应性表面积和全局改变上的玻璃粗糙度的影响。可以预期粗糙度可以按比例地增加反应性表面积并改变局部改变条件。因此，本研究的目的是评估表面粗糙度和粗糙度对模型中世纪型玻璃的改变的影响。在水性介质上在具有不同初始表面粗糙度水平的样品中进行实验。结果表明，对于最初光滑的表面，改变的层是连续的并且倾向于缩放，而对于最初的表面，改变在形态学和组合物中具有非均相的，并且粗糙度高度挖空。令人惊讶的是，尽管存在这些差异，所改变的玻璃的量相对相似，表明粗糙度不会显着增加反应性表面积。这是通过在粗糙度中的快速解决方案饱和来解释，从而最大限度地减少其对全局变更的贡献。

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