29 citations · 127 across the 24 of their papers we have counts for
25 papers
Effect of crystallographic texture on dealloying kinetics and composition of nanoporous gold surface
Ezgi Hatipoğlu, Ayman A. El-Zoka, Yujun Zhao +4
Nanoporous metals allow for tailoring composition and surface-to-volume ratio, both aspects critical for applications in catalysis. Here, Ag70Au30 (2 at. %) films with a face-cente…
Vacuum Dealloyed Brass as Li-Metal Battery Current Collector: Effect of Zinc and Porosity
Eric V Woods, Xinren Chen, Shaolou Wei +19
"Anode-free" lithium-metal batteries promise significantly higher energy density than conventional graphite-based lithium-ion batteries; however, lithium dendrite growth can lead t…
Magnetocaloric effect of Fe47.5Ni37.5Mn15 bulk and nanoparticles: A cost-efficient alloy for room temperature magnetic refrigeration
Chang-Gi Lee, Varatharaja Nallathambi, TaeHyeok Kang +6
The development of magnetic refrigerators that operate at room temperature without the use of environmentally harmful substances represents a significant advancement in eco-friendl…
Mapping the path to Cryogenic Atom Probe Tomography Analysis of biomolecules
Eric V. Woods, Tim M. Schwarz, Mahander P. Singh +7
The understanding of protein structure, folding, and interaction with other proteins remains one of the grand challenges of modern biology. Tremendous progress has been made thanks…
Analysis of water ice in nanoporous copper needles using cryo atom probe tomography
Levi Tegg, Ingrid E. McCarroll, Se-Ho Kim +5
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 physic…
On the role of Grain Boundary Character in the Stress Corrosion Cracking of Nanoporous Gold Thin Films
Aparna Saksena, Ayman El-Zoka, Alaukik Saxena +3
For its potential as a catalyst, nanoporous gold (NPG) prepared through dealloying of bulk Ag-Au alloys has been extensively investigated. NPG thin films can offer ease of handling…
Nanoporous gold thin films as substrates to analyze liquids by cryo-atom probe tomography
E. V. Woods, A. Saksena, A. A. El-Zoka +7
Cryogenic atom probe tomography (cryo-APT) is being developed to enable nanoscale compositional analyses of frozen liquids. Yet, the availability of readily available substrates th…
Scalable Substrate Development for Aqueous Biological Samples for Atom Probe Tomography
Eric V. Woods, Se-Ho Kim, Ayman A. El-Zoka +2
Reliable and consistent preparation of atom probe tomography (APT) specimens from aqueous and hydrated biological specimens remains a significant challenge. One particularly diffic…
Near-Atomic Scale Perspective on the Oxidation of TiCT MXenes: Insights from Atom Probe Tomography
Mathias Krämer, Bar Favelukis, Ayman A. El-Zoka +5
MXenes are a family of 2D transition metal carbides and nitrides with remarkable properties and great potential for energy storage and catalysis applications. However, their oxidat…
A versatile and reproducible cryo-sample preparation methodology for atom probe studies
Eric V. Woods, Mahander P. Singh, Se-Ho Kim +5
Repeatable and reliable site-specific preparation of specimens for atom probe tomography (APT) at cryogenic temperatures has proven challenging. A generalized workflow is required…
B dopant evolution in Pd catalysts after H evolution/oxidation reaction in alkaline environment
Se-Ho Kim, Su-Hyun Yoo, Leonardo Shoji Aota +4
Introduction of interstitial dopants has opened a new pathway to optimize nanoparticle catalytic activity for, e.g., hydrogen evolution/oxidation and other reactions. Here, we disc…
The fate of water in hydrogen-based iron oxide reduction
Ayman A. El-Zoka, Leigh T. Stephenson, Se-Ho Kim +2
Gas-solid reactions are cornerstones of many catalytic and redox processes that will underpin the energy and sustainability transition. The specific case of hydrogen-based iron oxi…
Effect of Pore Formation on Redox-Driven Phase Transformation
Xuyang Zhou, Yang Bai, Ayman A. El-Zoka +7
When solid-state redox-driven phase transformations are associated with mass loss, vacancies are produced that develop into pores. These pores can influence the kinetics of certain…
Understanding the degradation of a model Si-anode in Li-ion battery at the atomic-scale
Se-Ho Kim, Kang Dong, Huan Zhao +7
Si-anodes have long been candidates thanks to an expected ten-fold increase in capacity compared to graphite. However, details of the mechanisms governing their degradation remain…
Controlled doping of electrocatalysts through engineering impurities
Se-Ho Kim, Su-Hyun Yoo, Sangyong Shin +9
Fuel cells recombine water from H2 and O2 thereby powering e.g. cars or houses with no direct carbon emission. In anion-exchange membrane fuel cells (AEMFCs), to reach high power d…
Atom probe analysis of battery materials: challenges and ways forward
Se-Ho Kim, Stoichko Antonov, Xuyang Zhou +6
The worldwide developments of electric vehicles, as well as large-scale or grid-scale energy storage to compensate the intermittent nature of renewable energy generation has genera…
Laser-equipped gas reaction chamber for probing environmentally sensitive materials at near atomic scale
Heena Khanchandani, Ayman A. El-Zoka, Se-Ho Kim +6
Numerous metallurgical and materials science applications depend on quantitative atomic-scale characterizations of environmentally-sensitive materials and their transient states. S…
Understanding alkali contamination in colloidal nanomaterials to unlock grain boundary impurity engineering
Se-Ho Kim, Su-Hyun Yoo, Poulami Chakraborty +10
Metal nano-aerogels combine a large surface area, a high structural stability, and a high catalytic activity towards a variety of chemical reactions. The performance of such nanost…
Phase Separation and Anomalous Volume Expansion in Frozen Microscale Eutectic Indium-Gallium upon Remelting
Se-Ho Kim, Leigh T. Stephenson, Alisson K. da Silva +2
The eutectic Ga-In (EGaIn) alloy has low vapor pressure, low toxicity, high thermal and electrical conductivities, and thus has shown a great potential for smart material applicati…
Multidimensional thermally-induced transformation of nest-structured complex Au-Fe nanoalloys towards equilibrium
Jacob Johny, Oleg Prymak, Marius Kamp +9
Bimetallic nanoparticles are often superior candidates for a wide range of technological and biomedical applications, thanks to their enhanced catalytic, optical, and magnetic prop…
A liquid metal encapsulation for analyzing porous nanomaterials by atom probe tomography
Se-Ho Kim, Ayman A. El-Zoka, Baptiste Gault
Analyzing porous (nano)materials by the atom probe tomography has been notoriously difficult. The electrostatic pressure intensifies stress at voids which results in premature fail…
Influence of microstructure and atomic-scale chemistry on iron ore reduction with hydrogen at 700°C
Se-Ho Kim, Xue Zhang, Kevin Schweinar +10
With 1.85 billion tons produced per year, steel is the most important material class in terms of volume and environmental impact. While steel is a sustainability enabler, for insta…
Controlling the oxidation of magnetic and electrically conductive solid-solution iron-rhodium nanoparticles synthesized by Laser Ablation in Liquids
Ruksan Nadarajah, Shabbir Tahir, Joachim Landers +11
This study focuses on the synthesis of FeRh nanoparticles via pulsed laser ablation in liquid and on controlling the oxidation of the synthesized nanoparticles. Formation of monomo…
Status and direction of atom probe analysis of frozen liquids
Patrick Stender, Baptiste Gault, Tim M. Schwarz +8
Imaging of liquids and cryogenic biological materials by electron microscopy has been recently enabled by innovative approaches for specimen preparation and the fast development of…