A
Asher C. Leff
Researcher at United States Army Research Laboratory
Publications - 83
Citations - 1053
Asher C. Leff is an academic researcher from United States Army Research Laboratory. The author has contributed to research in topics: Chemistry & Grain boundary. The author has an hindex of 12, co-authored 66 publications receiving 549 citations. Previous affiliations of Asher C. Leff include Drexel University.
Papers
More filters
Journal ArticleDOI
Direct Detection Electron Energy-Loss Spectroscopy: A Method to Push the Limits of Resolution and Sensitivity
James L. Hart,Andrew C. Lang,Asher C. Leff,Paolo Longo,Colin Trevor,Ray D. Twesten,Mitra L. Taheri +6 more
TL;DR: Clear improvements in measured detective quantum efficiency and combined energy resolution/energy field-of-view are offered by counting mode direct detection, showing promise for efficient spectrum imaging, low-dose mapping of beam-sensitive specimens, trace element analysis, and time-resolved spectroscopy.
Journal ArticleDOI
Origin of High Activity and Durability of Twisty Nanowire Alloy Catalysts under Oxygen Reduction and Fuel Cell Operating Conditions
Zhijie Kong,Zhijie Kong,Yazan Maswadeh,Jorge A. Vargas,Shiyao Shan,Zhi-Peng Wu,Haval Kareem,Asher C. Leff,Dat T. Tran,Fangfang Chang,Shan Yan,Sanghyun Nam,Xingfang Zhao,Jason M. Lee,Jin Luo,Sarvjit Shastri,Gang Yu,Valeri Petkov,Chuan-Jian Zhong +18 more
TL;DR: An efficient surfactant-free synthesis route for producing a twisty nanowire (TNW) shaped platinum-iron alloy catalyst (PtFe TNWs) with controllable bimetallic composition is described with striking finding that the activity strongly depends on the composition of the as-synthesized catalysts.
Journal ArticleDOI
Unraveling the origin of twin related domains and grain boundary evolution during grain boundary engineering
TL;DR: In this paper, the authors provide insight into the grain boundary engineering process by examining sequential progression of the same spatial location of a twin related microstructure through thermomechanical processing.
Journal ArticleDOI
The role of grain size in He bubble formation: Implications for swelling resistance
Osman El-Atwani,James E. Nathaniel,Asher C. Leff,Brittany Muntifering,Jon K. Baldwin,Khalid Hattar,Mitra L. Taheri +6 more
TL;DR: In this paper, the performance of nanocrystalline iron films is investigated in-situ in a transmission electron microscope (TEM) using He irradiation at 700 K, and the role of grain orientation and grain boundary character on bubble density trends is explored.
Journal ArticleDOI
Direct Observation of Sink-Dependent Defect Evolution in Nanocrystalline Iron under Irradiation
TL;DR: To examine the validity of trends, loop density and area for different grains at various irradiation doses were compared and revealed efficient defect absorption in the nanocrystallinegrain size regime, but loop coalescence in the ultra-fine grain size regime.