A facile one-pot route to fabricate nanoporous copper with controlled hierarchical pore size distributions through chemical dealloying of Al–Cu alloy in an alkaline solution

Liu, Wenbo; Zhang, S.C.; Li, N.; Zheng, Jiwei; Xing, Yalan

doi:10.1016/j.micromeso.2010.10.003

Cited by 98 publications

(58 citation statements)

References 37 publications

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“…8) On the other hand, it has been shown that the microstructure of the starting materials plays a critical role in the formation of the final nanoporous structures. 1,2,913) The characteristics of the casting structures, the intermetallics, and the phase segregations typical of the crystalline alloys, such as AlCu, 1,2,10) NiCuMn, 9) NiMn, 11) TiCu 12,13) alloys are reflected in the final porous structures. Recently, uniform nanoporous formations of amorphous TiCu and Pd 30 Ni 50 P 20 precursors have been attained after dealloying.…”

Section: Introductionmentioning

confidence: 99%

Refinement of Nanoporous Copper: A Summary of Micro-Alloying of Au-Group and Pt-Group Elements

2014

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The micro-alloying of 1 at% metals of Au-Group (Ag, Au) and the Pt-Group (Ni, Pd, Pt) with the Ti 60 Cu 40 amorphous alloy resulted in the formation of fine nanoporous copper (NPC) in the order of 628 nm. The smallest characteristic pore size of opencell nanoporous fcc Cu was 7 and 6 nm after dealloying the amorphous Ti 60 Cu 39 Pd 1 and Ti 60 Cu 39 Pt 1 precursor alloys for 43.2 ks in 0.03 M HF solution, while NPC had a pore size of 39 nm after dealloying the amorphous Ti 60 Cu 40 precursor alloy. On the basis of TEM micrographs, the refining factor increased approximately from 4 for the Ti 60 Cu 39 Ag 1 precursor alloy to 1780 for the Ti 60 Cu 39 Pt 1 precursor alloy. The refinement was attributed to the dramatic decrease in the surface diffusivity during dealloying. The refinement efficiency of the micro-alloying of the Pt-group elements was higher than that of the Au-group elements. The homogeneous distribution of additives in both of the amorphous precursor alloys and the final stabilized NPCs played a key role in refining the NPCs. This strategy may contribute to the fabrication of cost-effective nanoporous metals with a nanoporosity comparable to that of nanoporous Au, Pd and Pt catalysts.

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Section: Introductionmentioning

confidence: 99%

Refinement of Nanoporous Copper: A Summary of Micro-Alloying of Au-Group and Pt-Group Elements

2014

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“…The surface energy is 1.79 J/m 2 for Cu. 7) The surface diffusivity of Cu adatoms in 0.03 and 0.13 kmol/m /s (Fig. 5(c)) by using eq.…”

Section: )mentioning

confidence: 99%

“…Many NPCs have been prepared from crystalline alloys. 1,38) The effects of the intermetallic phase in AlCu, 4,6,7) MnCu, 5,10) AlPd, 4,9) AlAu, 11) AgAu, 1,8) NiMn 12) binary alloys on the final nanoporous structure were investigated extensively. The final nanoporous metals have a sort of multimodal pore-to-ligament structures with various distribution of pore sizes and ligaments from one zone to another one.…”

Section: Introductionmentioning

confidence: 99%

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Dealloying Behaviours of an Equiatomic TiCu Alloy

et al. 2013

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The crystalline Ti 50 Cu 50 ribbon was prepared by annealing its amorphous counterpart at 773 K, 84 K higher than its crystallization temperature. An equiatomic TiCu intermetallic phase dominated in the matrix coexisting with trace Ti 2 Cu phase segregated on the grain boundary. A bi-continuous nanoporous copper from tenths of nanometers to hundredths of nanometers was obtained after dealloying the crystalline Ti 50 Cu 50 ribbons in 0.03 and 0.13 kmol/m 3 HF solutions. The TiCu phase stayed inert at the initial immersion and the Ti 2 Cu zone preferentially dissolved to form trenches. After a prolonged immersion in HF solutions, both TiCu and Ti 2 Cu phases were fully dealloyed. Final nanoporous Cu had a multiple-channel characteristic in different regions where various intermetallic phases distributed. Finer nanoporous Cu formed in the regions where the TiCu phase with a higher electrochemical stability dominated.

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“…For this reason, rapid solidification is the most desirable method to achieve smaller grain size. One remarkable tool is the single roller melt spinning apparatus that renders grains of the samples of a few tens of micrometers [9][10][11][12]. After the precursor ingots solidify, they are annealed to stabilize their microstructure [7].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a Porous Metal via Selective Phase Dissolution in Al-Cu Alloys

Vargas-Martínez

Estela-García

Suárez

et al. 2018

Metals

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Through free corrosion, a new low cost porous material was successfully fabricated by removing a single phase of a binary aluminum-copper alloy. This selective phase dissolution was carried out an Al-Al 2 Cu eutectic alloy of the Al-Cu binary system and additionally for two hypereutectic compositions. The porosity of the material depends on the microstructure formed upon solidification. For this reason, several solidification methods were studied to define the most convenient in terms of uniformity and refinement of the average pore and ligament sizes. The samples were corroded in a 10% v/v NaOH aqueous solution, which demonstrated to be the most convenient in terms of time involved and resulting porosity conditions after the corrosion process. The porosity was measured through analysis of secondary electron images. The effectiveness of the process was verified using X-ray diffraction, which showed that, under the proposed methodology, there was complete removal of one of the phases, namely the aluminum one.

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A facile one-pot route to fabricate nanoporous copper with controlled hierarchical pore size distributions through chemical dealloying of Al–Cu alloy in an alkaline solution

Cited by 98 publications

References 37 publications

Refinement of Nanoporous Copper: A Summary of Micro-Alloying of Au-Group and Pt-Group Elements

Refinement of Nanoporous Copper: A Summary of Micro-Alloying of Au-Group and Pt-Group Elements

Dealloying Behaviours of an Equiatomic TiCu Alloy

Fabrication of a Porous Metal via Selective Phase Dissolution in Al-Cu Alloys

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