Bi-Continuous Porous Structures from the Selective Dissolution of Ionic Solid Solutions

Diwen Xiao, Y. Ke, Congcheng Wang, Chunyong He, Qing Chen
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引用次数: 2

Abstract

Abstract Bi-continuous porous metal evolves from the selective dissolution of an alloy, a process known as dealloying. Here we report a similar observation in the selective dissolution of NaCl from a NaCl-AgCl solid solution. A procedure of simultaneous quenching and dissolution that retains the homogeneity of the solution is designed with the help of small-angle neutron scattering. The process in water creates bi-continuous porous AgCl of smooth ligaments and pores ~300 nm wide, which can coarsen up without altering the bi-continuous morphology. Post-mortem elemental analysis identifies a NaCl-compositional threshold at 35%, below which no dissolution occurs, a critical behavior suggestive of the need for percolating dissolution pathways. The work reveals intriguing similarities between the selective dissolutions of metallic and ionic solid solutions, bridging their mechanisms and promising new ways of fabricating functional porous materials.
离子固体溶液选择性溶解的双连续多孔结构
双连续多孔金属是由合金的选择性溶解演变而来的,这一过程被称为脱合金。在这里,我们报告了在NaCl- agcl固溶体中NaCl选择性溶解的类似观察。利用小角中子散射,设计了一种保持溶液均匀性的同时淬火和溶解的方法。该工艺在水中生成了双连续多孔AgCl,具有光滑的韧带和约300 nm宽的孔,可以在不改变双连续形态的情况下进行粗化。死后元素分析确定了nacl组成阈值为35%,低于此阈值不会发生溶解,这是一个关键行为,表明需要渗透溶解途径。这项工作揭示了金属和离子固溶体选择性溶解之间有趣的相似之处,连接了它们的机制,并有希望制造功能多孔材料的新方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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