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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 >Permeability measurement in composite aerogels: application to nuclear waste storage
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Permeability measurement in composite aerogels: application to nuclear waste storage

机译：复合气凝胶的渗透率测量：在核废料存储中的应用

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For long-life nuclear wastes (essentially actinides) research is in progress to develop new matrices with improved chemical durability. High-silica-content glasses possess a high chemical durability and we propose a new process to prepare silica glass which will embed the nuclear wastes. A porous network (silica aerogel) is used as a host matrix for nuclear wastes. The porous aerogel is soaked in a solution containing the actinides in nitrate salt form. After drying and nitrate decomposition, the composite material is fully sintered trapping the nuclear waste. Neodymium and cerium oxides are used to simulate the actinide oxides. A new kind of aerogel (composite aerogel) is proposed owing to its improved mechanical strength and relatively large permeability. A simple analysis of impregnation data is used to calculate the permeability. Increasing the bulk density from 0.4 to 1.4 g/cm(3) decreases the permeability from 200 to 20 nm(2) and increases the mechanical properties by two orders of magnitude. The influence of the porous network features (mechanical properties, mean pore size) on the ability of the material to soak up the simulating salts is discussed. This process allows the preparation of materials with a simulant content close to 20 wt%. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 9]
机译：对于长寿命核废料（本质上是act系元素），正在研究开发具有更高化学耐久性的新基质。高二氧化硅含量的玻璃具有很高的化学耐久性，因此我们提出了一种制备可嵌入核废料的二氧化硅玻璃的新工艺。多孔网络（二氧化硅气凝胶）被用作核废料的基质。将多孔气凝胶浸入含有硝酸盐形式的act系元素的溶液中。干燥和硝酸盐分解后，复合材料被完全烧结，捕获核废料。钕和铈的氧化物用于模拟the系元素的氧化物。由于其改善的机械强度和相对较大的渗透性，提出了一种新型的气凝胶（复合气凝胶）。浸渍数据的简单分析用于计算渗透率。将堆积密度从0.4增加到1.4 g / cm（3），将磁导率从200 nm（2）减少到20 nm（2），并将机械性能提高两个数量级。讨论了多孔网络特征（机械性能，平均孔径）对材料吸收模拟盐能力的影响。该方法允许制备模拟物含量接近20wt％的材料。 （C）2001 Elsevier Science B.V.保留所有权利。 [参考：9]

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