TY - GEN
T1 - ROBUST AND SCALABLE SYNTHESIS OF HIGH SURFACE AREA POROUS COPPER SPHERIODIZED POWDERS BY ELECTROLESS CHEMICAL DEALLOYING
AU - Niauzorau, Stanislau
AU - Kublik, Natalya
AU - Hasib, Amm
AU - Azeredo, Bruno
N1 - Funding Information:
We acknowledge the use of facilities with the LeRoy Eyring Center for Solid State Science at Arizona State University and John M. Cowley High Resolution Electron Microscopy at Arizona State University. We acknowledge the National Science Foundation under Grant No. CMMI-1932899.
Publisher Copyright:
Copyright © 2022 by ASME.
PY - 2022
Y1 - 2022
N2 - In the past decade, nanoporous metals have been a point of interest in the scientific community because they exhibit chemical, optical, and mechanical properties that are unique from their bulk counterparts. One of the most prominent method for its synthesis is chemical dealloying. While, under electrolytic conditions, dealloying can use process-inputs such as current density and electrical potential to control the ligament size during its synthesis with excellent reproducibility, electroless methods are plagued by the lack of local control of dealloying rates which introduces batch-to-batch variations in ligament size. Given that powder is a format incompatible with electrolysis, this study shows an approach to safely scale fabrication of spherical porous copper powders containing oxides from gas atomized Cu-Al powders. Additionally, the agglomeration that is commonly associated with porous powder fabrication was addressed by its functionalization with an anionic surfactant and powder washing in both deionized water (polar) and anhydrous ethanol (nonpolar). Additionally, hazards associated with its production scaling such as excessive hydrogen evolution, heat generation due to its high-reactivity and exothermic reaction and pyrophoricity are discussed and addressed. As a result of this study, a robust and scalable approach was developed to produce 100 of grams of porous metal powders.
AB - In the past decade, nanoporous metals have been a point of interest in the scientific community because they exhibit chemical, optical, and mechanical properties that are unique from their bulk counterparts. One of the most prominent method for its synthesis is chemical dealloying. While, under electrolytic conditions, dealloying can use process-inputs such as current density and electrical potential to control the ligament size during its synthesis with excellent reproducibility, electroless methods are plagued by the lack of local control of dealloying rates which introduces batch-to-batch variations in ligament size. Given that powder is a format incompatible with electrolysis, this study shows an approach to safely scale fabrication of spherical porous copper powders containing oxides from gas atomized Cu-Al powders. Additionally, the agglomeration that is commonly associated with porous powder fabrication was addressed by its functionalization with an anionic surfactant and powder washing in both deionized water (polar) and anhydrous ethanol (nonpolar). Additionally, hazards associated with its production scaling such as excessive hydrogen evolution, heat generation due to its high-reactivity and exothermic reaction and pyrophoricity are discussed and addressed. As a result of this study, a robust and scalable approach was developed to produce 100 of grams of porous metal powders.
KW - dealloying
KW - porous metals
KW - scalability
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U2 - 10.1115/MSEC2022-85894
DO - 10.1115/MSEC2022-85894
M3 - Conference contribution
AN - SCOPUS:85140931318
T3 - Proceedings of ASME 2022 17th International Manufacturing Science and Engineering Conference, MSEC 2022
BT - Additive Manufacturing; Biomanufacturing; Life Cycle Engineering; Manufacturing Equipment and Automation; Nano/Micro/Meso Manufacturing
PB - American Society of Mechanical Engineers
T2 - ASME 2022 17th International Manufacturing Science and Engineering Conference, MSEC 2022
Y2 - 27 June 2022 through 1 July 2022
ER -