A5020994101- Electronic Packaging and Soldering Technologies
- Copper-based nanomaterials and applications
- Surface and Thin Film Phenomena
- Advancements in Battery Materials
- ZnO doping and properties
- nanoparticles nucleation surface interactions
- Advanced Battery Materials and Technologies
- Electronic and Structural Properties of Oxides
- Extraction and Separation Processes
- Advanced Welding Techniques Analysis
- Electrochemical sensors and biosensors
- Nanowire Synthesis and Applications
- Nanoporous metals and alloys
- Copper Interconnects and Reliability
- Semiconductor materials and interfaces
- Plasma Diagnostics and Applications
- Nanocluster Synthesis and Applications
- Advanced Materials Characterization Techniques
- Advanced Thermoelectric Materials and Devices
- Ion-surface interactions and analysis
- Supercapacitor Materials and Fabrication
- Marine Toxins and Detection Methods
- Electrocatalysts for Energy Conversion
- 3D IC and TSV technologies
- Gear and Bearing Dynamics Analysis
Qilu University of Technology
2024
Binghamton University
2013-2020
State University of New York
2014-2017
Tongji University
2016
Mayaterials (United States)
2009
The atomic-scale reduction mechanism of α-Fe2O3 nanowires by H2 was followed using transmission electron microscopy to reveal the evolution atomic structures and associated transformation pathways for different iron oxides. commences with generation oxygen vacancies that order onto every 10th [Formula: see text] plane. This vacancy ordering is an allotropic → γ-Fe2O3 along formation Fe3O4 nanoparticles on surface nanowire a topotactic process, which shows 3D correspondence between product...
ε-LiVOPO4 is a promising multielectron cathode material for Li-ion batteries that can accommodate two electrons per vanadium, leading to higher energy densities. However, poor electronic conductivity and low lithium ion diffusivity currently result in rate capability cycle life. To enhance the electrochemical performance of ε-LiVOPO4, this work, we optimized its solid-state synthesis route using situ synchrotron X-ray diffraction applied combination high-energy ball-milling with...
The Cu-Sn metallurgical soldering reaction in two-segmented nanowires is studied by situ transmission electron microscopy. By varying the relative lengths of Cu and Sn segments, we show that results a solid solution for small Sn/Cu length ratio while intermetallic compounds (IMCs) larger ratios. Upon heating to ∼500 °C, two phase transformation pathways occur, η-Cu6Sn5 → ε-Cu3Sn δ-Cu41Sn11 with long segment γ-Cu3Sn short segment. evolution Kirkendall voids demonstrates diffuses faster than...
Sn-based alloy materials are strong candidates to replace graphitic carbon as the anode for next generation lithium-ion batteries because of their much higher gravimetric and volumetric capacity. A series nanosize Sn y Fe alloys derived from chemical transformation preformed nanoparticles templates have been synthesized characterized. An optimized Sn5Fe/Sn2Fe with a core-shell structure delivered 541 mAh·g-1 after 200 cycles at C/2 rate, retaining close 100% initial Its capacity is double...
Olivine MnPO4 is the delithiated phase of lithium-ion-battery cathode (positive electrode) material LiMnPO4, which formed at end charge. This metastable under ambient conditions and can only be produced by delithiation LiMnPO4. We have revealed manganese dissolution phenomenon during chemical causes amorphization olivine MnPO4. The properties crystalline obtained from carbon-coated LiMnPO4 amorphous product resulting pure were studied compared. phosphorus-rich phases in latter are considered...
Tin/indium (Sn/In) nanosolder particles, synthesized by a surfactant-assisted chemical reduction method at room temperature, were not in an equilibrium state; however, the state was effectively attained through post-synthesis heat treatment.
Abstract Dealloying typically occurs via the chemical dissolution of an alloy component through a corrosion process. In contrast, here we report atomic-scale nonchemical dealloying process that results in clustering solute atoms. We show disparity adatom–substrate exchange barriers separate Cu adatoms from Cu–Au mixture, leaving behind fluid phase enriched with Au subsequently aggregate into supported clusters. Using dynamic, electron microscopy observations and theoretical modeling,...
We report<italic>in situ</italic>atomic-scale transmission electron microscopy observations of the surface dynamics during Cu<sub>2</sub>O reduction.
A carbon confinement layer leads to the change in reduction mechanism of CuO nanowires from a surface dominated process nucleation and growth bulk nanowire fragmentation.
The soldering reactions of three-segmented Sn/Cu/Sn and Cu/Sn/Cu diffusion couples are monitored by in-situ transmission electron microscopy to reveal the metallurgical reaction mechanism associated phase transformation pathway. For couples, there is no ε-Cu3Sn formation due relatively insufficient Cu as compared Sn. Kirkendall voids form initially in segment then disappear volume expansion with continued intermetallic compound (IMC) progresses. incoming Sn atoms react η-Cu6Sn5, continuous...
In this work, we show that Cu-Sn based nanowires can be used as a one-dimensional (1-D) diffusion couple to study the atomic diffusion. order control nano-soldering process and form reliable nano-joints (nanoscale interconnects between nanowires), fundamental of wetting intermetallic at small dimension is necessary. An electrodeposition method synthesize multisegmented in nanoporous templates diameter range 15-200 nm length up 20 μm. By choosing two-segment Sn-Cu symmetric three-segment...
Pb-free nano solders offer exceptional opportunities for making nanoscale contacts as needed with the miniaturization of devices well production nanosized circuits.Pb-free have been extensively produced in bulk, powder and thin films.However, knowledge many properties Pbfree nanosolders, including diffusion, intermetallic reaction mechanisms phase evolution is still very limited.Using a two-segment copper-tin (Cu-Sn) nanowire model system, which Sn acts solder element Cu serves functional...
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With the rapid development of railway industry, speed and load vehicle has been significantly increasing but operation environment becomes worse.All these will cause problems for wheel-rail wear.And all potential risk to vehicle.Wheel-rail relation always got a lot attention as most important complicated project in field dynamics.This article research fast algorithm calculate non-Hertzian contact situation based on basic mechanics model which is called semi-Hertzian algorithm.It also uses...
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