Analysis of Water Ice in Nanoporous Copper Needles Using Cryo Atom Probe Tomography
Source abstract
Abstract
Abstract The application of atom probe tomography (APT) to frozen liquids is limited by difficulties in specimen preparation. Here, we report on the use of nanoporous Cu needles as a physical framework to hold water ice for investigation using APT. Nanoporous Cu needles are prepared by electropolishing and dealloying Cu–Mn matchstick precursors. Cryogenic scanning electron microscopy and focused ion beam milling reveal a hierarchical, dendritic, highly wettable microstructure. The atom probe mass spectrum is dominated by peaks of Cu+ and H(H2O)n+ up to n ≤ 3, and the reconstructed volume shows the protrusion of a Cu ligament into an ice-filled pore. The continuous Cu ligament network electrically connects the apex to the cryostage, leading to an enhanced electric field at the apex and increased cooling, both of which simplify the mass spectrum compared to previous reports.
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Research context
OpenAlex topics: Advanced Materials Characterization Techniques · Nanoporous metals and alloys · nanoparticles nucleation surface interactions
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney , Camperdown, New South Wales 2006 ,
Australian Centre for Microscopy and Microanalysis, The University of Sydney , Camperdown, New South Wales 2006 ,
Department of Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung , Max-Planck-Straße 1, 40237 Düsseldorf ,
Department of Materials Science and Engineering, Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 02841 ,
Department of Materials, Royal School of Mines, Imperial College London , Exhibition Road, London SW7 2AZ ,
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