Article
Chemistry, Physical
Jie Li, Zhi-Bin Yi, Nuo-Tong Li, Na-Na Yu, Hao-Ran Geng
Summary: This work focuses on the refinement of nanoporous copper (NPC) ligaments through the use of SDS surfactant in the dealloying process. The study shows that the addition of SDS leads to a decrease in the size of the ligaments in the NPC structure. It is also found that increasing SDS concentration results in the formation of nano-sized cones on the network surface.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Chaoyang Wang, Shengli Zhu, Yanqin Liang, Chunling Qin, Fang Wang, Hao Wang, Chuntao Chang, Akihisa Inoue
Summary: We report a novel nanoporous CrFe alloy with ordered structure, which shows rapid strain hardening and high resistance to deformation. The regular skeletons can be entirely compacted between parallel two sides, facilitating the densification of nanoporous alloy. The presence of internal boundaries acts as barriers for dislocation motion, thus improving strain hardening.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Hongxia Zhong, Chunbao Feng, Hai Wang, Dan Han, Guodong Yu, Wenqi Xiong, Yunhai Li, Mao Yang, Gang Tang, Shengjun Yuan
Summary: Researchers investigated the electronic properties of inorganic antiperovskite nitrides through first-principles calculations, revealing a linear relationship between tolerance factor and various physical quantities, and designed a promising antiperovskite alloy. They also made a comprehensive comparison with conventional halide perovskites to point out the future direction for device applications.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Samuel S. Welborn, Alexander Simafranca, Zeyu Wang, Heng Wei, Eric Detsi
Summary: This research presents a green alternative method for synthesizing NP-Au using chelation-mediated dealloying, which involves the use of non-toxic EDTA solution to produce high-quality NP-Au.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Coatings & Films
Yiku Xu, Geng Wang, Qi Song, Xinyu Lu, Zhiyuan Li, Qinyang Zhao, Yongnan Chen
Summary: In this study, ceramic SiC particles were introduced to high entropy alloy coatings and their effects on microstructures and properties were investigated. The decomposition of SiC particles had a significant influence on the microstructure of the alloy coatings and decreased the corrosion resistance of the coatings.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Metallurgy & Metallurgical Engineering
Ming Gao, Ke Yang, Lili Tan, Zheng Ma
Summary: In this study, fine-grained ZN20 alloy was obtained by combining ECAP with extrusion, resulting in improved ductility and corrosion resistance.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Chemistry, Physical
Sawsan Ibrahim, Alexandra Dworzak, Daniel Crespo, Frank Uwe Renner, Carsten Dosche, Mehtap Oezaslan
Summary: This study investigates the dealloying processes of Zn80Cu20 alloy ribbons in different acidic and alkaline environments, revealing key factors that control the nanostructure. The presence of chloride ions in acidic media enhances Cu surface mobility, while in alkaline media, the lower surface diffusivity of Cu atoms results in smaller nanostructures.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Engineering, Environmental
Yanhao Wei, Yuwen Zhao, Yuefang Chen, Mengmeng Zhang, Zhijia Zhang, Jianli Kang, Xiaohua Ma, Yong Jiang, Yifang Zhang
Summary: High-entropy oxides (HEOs) have emerged as a promising anode material for lithium-ion batteries due to their entropy-stabilized structure, regulable electronic structure, and high theoretical capacity. In this study, a nanoporous high-entropy alloy@high-entropy oxide (np-HEA@HEO) composite is synthesized, which exhibits optimized Li storage performance. Lattice distortions and oxygen vacancies in the as-synthesized samples contribute to rapid Li+ transport, and a large portion of pseudocapacitance contributes to the fast kinetics. DFT calculations demonstrate the regulation of Li+ adsorption/desorption behavior and reaction kinetics by reduced d-p band energy difference and spin-dependent synergy in HEO. These findings provide new insights into the features and properties of HEO for Li storage.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Chun-Ying Lee, Hung-Hua Sheu, Leu-Wen Tsay, Po-Sen Hsiao, Tzu-Jing Lin, Hung-Bin Lee
Summary: Fe40Cr19Mo18C15B8 amorphous coatings were prepared using HVOF technology and heat treated at different temperatures. The coatings showed crystallization at 650 degrees C and a relatively flat surface morphology at 700 degrees C. Various analysis methods revealed that the coatings exhibited excellent corrosion resistance in high-temperature environments.
Article
Engineering, Environmental
Yuheng Zhou, Hui Deng, Xubo Huang, Yuntao Hu, Bin Ye, Linfang Lu
Summary: Deep-learning methods were used to establish the structure-property relationship of NPGs, accurately predicting the transformation capability of CO molecules on gold catalysts and demonstrating great application potential in future catalyst design.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Ye-Yuan Zhang, Lijie Zou, Ling-Zhi Liu, Hui Xie, Cui-Hong Li, Hai-Jun Jin
Summary: The self-organized anisotropic nanoporous gold (NPG) with unidirectional pore channels has shown significantly improved strength compared to previous studies. The unique structure and mechanical properties make it a promising material for various applications in the future.
Article
Materials Science, Multidisciplinary
Guangyu Ren, Lili Huang, Kunling Hu, Tianxin Li, Yiping Lu, Dongxu Qiao, Haitao Zhang, Dake Xu, Tongmin Wang, Tingju Li, Peter K. Liaw
Summary: A novel antibacterial high-entropy alloy with superior antibacterial properties and corrosion resistance was designed and prepared. The alloy exhibited higher antibacterial rates and yield strength compared to classic antibacterial stainless steels.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
O. R. Deluigi, F. Valencia, N. Amigo, F. Aquistapace, R. Gonzalez, E. M. Bringa
Summary: High-entropy alloys display excellent mechanical properties, but the chemical complexity reduces the ductility of nanoporous FCC high-entropy alloy samples.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Ming Gao, Ke Yang, Lili Tan, Zheng Ma
Summary: By adopting bi-direction drawing, the deformation property and corrosion resistance of Mg-Zn-Nd alloy can be improved, making it safer and more effective for surgical staples during the reconstruction of the digestive tract.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Qingguo Bai, Chi Zhang, Fuquan Tan, Zhonghua Zhang
Summary: In this study, a series of ternary Al-Ni-Cu alloys with variable Ni/Cu ratios were designed to investigate their dealloying behaviors and electrochemical actuation performances. The change in Ni/Cu ratio was found to influence the microstructure and phase constituent of the alloys. Nanoporous Al-Ni-Cu alloys showed good electrochemical actuation performance and potential for practical applications.
Article
Chemistry, Multidisciplinary
Matthias Graf, Gregor B. Vonbun-Feldbauer, Marc T. M. Koper
Summary: By adsorbing oxygen molecules on a nanoporous gold electrode, preferential states for electron excitation can be created, enhancing the lifetime and photocurrent of hot charge carriers in plasmonic photocatalysis. Illumination increases the adsorbate coverage, leading to higher photocurrent, showcasing the potential of plasmonic approach in improving the efficiency of photoelectrochemical water splitting.
Article
Chemistry, Multidisciplinary
Christoph J. Bondue, Matthias Graf, Akansha Goyal, Marc T. M. Koper
Summary: The study focuses on the electrochemical reduction of CO2 at gold electrodes under mildly acidic conditions. Increasing the CO2 partial pressure enhances the rate of CO2 reduction and suppresses hydrogen evolution, leading to high Faradaic efficiencies close to 100%. By suppressing hydrogen evolution and using protons for water formation, the study derived a general design principle for acid CO2 electrolyzers to match the mass transfer of protons to the electrode surface.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Multidisciplinary Sciences
Shan Shi, Yong Li, Bao-Nam Ngo-Dinh, Juergen Markmann, Joerg Weissmueller
Summary: The study demonstrates the preparation of macroscopic hierarchical network nanomaterials through the self-organization processes of dealloying, which provide enhanced strength and stiffness at a given solid fraction, and allow for reduced solid fractions. The scaling laws for mechanics and atomistic simulation support these observations, indicating the systematic benefits of hierarchical structuring in nanoscale network structures. These materials may serve as prototypes for future lightweight structural materials.
Article
Materials Science, Multidisciplinary
Birthe Zandersons, Lukas Luhrs, Yong Li, Joerg Weissmueller
Summary: Nanoporous gold (NPG) made by dealloying exhibits mechanical behavior strongly influenced by ligament size and solid volume fraction. Stiffness and strength of the material show a better correlation to the gold atom fraction x(Au)(0) compared to the solid volume fraction phi. Spontaneous plastic deformation events during dealloying may lead to macroscopic shrinkage, decoupling phi from x(Au)(0).
Article
Materials Science, Multidisciplinary
Maowen Liu, Joerg Weissmueller
Summary: This study provides a direct observation of lattice defects in plastically deformed nanoporous gold, confirming the contribution of accumulation and interaction of defects to the strain hardening rate. The results show that plastic deformation significantly enhances the defect density, with twins formed on crystallographic planes and their interaction forming Lomer-Cottrell locks. This inhibits dislocation escaping, linking strain hardening to the accumulation and interaction of twins.
MATERIALS RESEARCH LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Jie Li, Jurgen Markmann, Jorg Weissmueller, Nadiia Mameka
Summary: This study reveals a new phenomenon of reversible change in the elastic response of hybrid electrochemical actuators, attributed to the thickness of the polypyrrole layer. The interaction between polypyrrole and gold, as well as solvent intake, play crucial roles in determining the elastic properties of the material.
Article
Materials Science, Multidisciplinary
Yong Li, Bao-Nam Ngo-Dinh, Juergen Markmann, Joerg Weissmueller
Summary: The study explores the evolution of silver-rich clusters in nanoporous gold formation through dealloying, illustrating their impact on the material's functional behavior. The size of these clusters decreases with increasing dealloying potential, showing a similar trend to that of ligaments. Experimental simulations confirm that the size of the silver-rich clusters can be measured and provides an experimental signature of the initial size in the process.
Article
Materials Science, Multidisciplinary
Joerg Weissmueller, Shan Shi
Summary: Elastic compliance of porous metals can be greatly enhanced by alloying mobile solutes into interstitial sites of the crystal lattice, as recent experiments have shown. These observations support the predictions by Gorsky and Larche and Cahn for the elasticity of open systems probed at constant chemical potential. The mechanism behind this enhancement involves an exchange of solutes between tensile and compressive fibers in the microstructure's beam-like elements.
Article
Chemistry, Physical
Alex Ricardo Silva Olaya, Franziska Kuehling, Christoph Mahr, Birthe Zandersons, Andreas Rosenauer, Joerg Weissmueller, Gunther Wittstock
Summary: Nanoporous gold (NPG) with less than 1% residual Ag content was studied as an electrocatalyst for the oxidation of methanol, formaldehyde, and formate. The surface structure and oxidation reaction of NPG can be controlled by adjusting the Ag content and potential. Ag has a significant impact on the onset potential and peak current density of the catalytic reaction.
Article
Chemistry, Multidisciplinary
Gideon Henkelmann, Diana Waldow, Maowen Liu, Lukas Luehrs, Yong Li, Joerg Weissmueller
Summary: Experimental results show that thin films of dealloyed nanoporous gold (NPG) spontaneously detach from massive gold base layers and densify near the external surface. This behavior is reproduced by kinetic Monte Carlo (KMC) simulation and is common for nanoscale network materials evolving by surface diffusion.
Article
Materials Science, Multidisciplinary
Maowen Liu, Joerg Weissmueller
Summary: This study investigates the microstructure and phase decomposition in nanoporous Au-Pt materials fabricated by dealloying. The findings reveal that the enrichment of Pt at the surface and Pt depletion in the bulk during dealloying result in a homogeneous single-phase state in the material. Annealing induces diffusion-driven coarsening and the formation of Pt-rich regions with crystallographic coherence and semi-coherent regions. The study demonstrates the high kinetic stability and tunability of surface composition in nanoporous alloys through annealing.
Article
Materials Science, Multidisciplinary
Sambit Bapari, Lukas Luehrs, Joerg Weissmueller
Summary: Researchers use nanoporous gold (NPG) and a leveled-wave model to characterize the characteristic length scale of random bicontinuous microstructures. By comparing experiment and model, they find that the size distribution is uniform over the cross-section of NPG samples and evolves self-similarly upon coarsening. The electrochemical capacitance ratio method accurately measures the size and correlates well with the model. The findings provide conversion factors between different size metrics and demonstrate the combination of NPG and the leveled-wave model as a showcase for characterizing random microstructures.
Article
Chemistry, Multidisciplinary
Benedikt Roschning, Joerg Weissmueller
ADVANCED MATERIALS INTERFACES
(2020)
Article
Multidisciplinary Sciences
Yong Li, Bao-Nam Dinh Ngo, Juergen Markmann, Jorg Weissmueller
Article
Nanoscience & Nanotechnology
Mareike Haensch, Matthias Graf, Weijia Wang, Alexei Nefedov, Christof Woell, Joerg Weissmueller, Gunther Wittstock
ACS APPLIED NANO MATERIALS
(2020)
