Light, strong, and stable nanoporous aluminum with native oxide shell.
Light, strong, and stable nanoporous aluminum with native oxide shell.
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DOI：
10.1126/sciadv.abb9471
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发表时间：
2021-07
期刊：
影响因子：
13.6
通讯作者：
Jin HJ
中科院分区：
文献类型：
--
作者：
Yang W;Luo ZP;Bao WK;Xie H;You ZS;Jin HJ
A stable and strong nanoporous aluminum-alumina core-shell composite is self-organized in a galvanic replacement reaction. Aluminum (Al) metal is highly reactive but has excellent corrosion resistance because of the formation of a self-healing passive oxide layer on the surface. Here, we report that this native aluminum oxide shell can also stabilize and strengthen porous Al when the ligament (strut) size is decreased to the submicron or nanometer scale. The nanoporous Al with native oxide shell, which is a nanoporous Al-Al2O3 core-shell composite self-organized in a galvanic replacement reaction, is nonflammable under ambient conditions and stable against coarsening near melting temperatures. This material is stronger than conventional foams of similar density consisting of pure Al or Al-based composites, and also lighter and stronger than most nanoporous metals reported previously. Its light weight, high strength, and excellent stability warrant the explorations of functional and structural applications of this material, if more efficient and scalable synthesis processes are developed in the future.
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