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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 >Investigation of gel porosity clogging during glass leaching
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Investigation of gel porosity clogging during glass leaching

机译：玻璃浸出过程中凝胶孔隙堵塞的研究

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摘要

A 5-oxide glass (62.5SiO(2), 16.6B(2)O(3), 13.1Na(2)O, 6.0CaO, 1.8ZrO(2)) was leached at 90 degrees C at a high glass-surface-area-to-solution-volume ratio (SA/V = 80 cm(-1)). Its dissolution rate diminished over time until it became unmeasurable. The alteration layer was characterized by Si-29 isotopic tracing in the leaching solution. ToF-SIMS elemental profiles showed that glass dissolution ceased due to clogging of the gel porosity at the gel/solution interface. One of the hypotheses proposed to account for the rate drop observed during borosilicate glass alteration is based on morphological changes in the alteration gel over time. Monte Carlo modeling of glass alteration, especially with simple glasses, indicates a clogging of the porosity on the external portion of the gel (near the solution/gel interface) after densification of the layer by silicon precipitation, but this phenomenon had never previously been directly observed experimentally. The initial results obtained by isotopic tracing provide new data that appears to confirm this hypothesis.
机译：在高玻璃表面上于90摄氏度浸出了5氧化物玻璃（62.5SiO（2），16.6B（2）O（3），13.1Na（2）O，6.0CaO，1.8ZrO（2）） -溶液体积比（SA / V = 80 cm（-1））。随着时间的流逝，它的溶解速度逐渐降低，直到无法测量为止。通过浸出溶液中的Si-29同位素示踪表征蚀变层。 ToF-SIMS元素概况表明，由于凝胶/溶液界面处的凝胶孔隙堵塞，玻璃溶解停止了。提出的解释硼硅酸盐玻璃蚀变过程中观察到的速率下降的一种假设是基于蚀变凝胶随时间的形态变化。蒙特卡洛模型对玻璃变化（尤其是简单玻璃的变化）的模拟表明，由于硅沉淀致密化了层之后，凝胶外部（靠近溶液/凝胶界面）的孔隙被堵塞了，但是这种现象以前从未被直接发现过实验观察。通过同位素示踪获得的初步结果提供了新的数据，似乎证实了这一假设。

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