A5020331488- Force Microscopy Techniques and Applications
- Thermal properties of materials
- Mechanical and Optical Resonators
- Graphene research and applications
- Adhesion, Friction, and Surface Interactions
- Surface Modification and Superhydrophobicity
- Gamma-ray bursts and supernovae
- Additive Manufacturing and 3D Printing Technologies
- Aluminum Alloys Composites Properties
- Polymer crystallization and properties
- Muon and positron interactions and applications
- Advanced Thermoelectric Materials and Devices
- 2D Materials and Applications
- Semiconductor materials and interfaces
- Advanced ceramic materials synthesis
- Pulsars and Gravitational Waves Research
- MXene and MAX Phase Materials
- High-Velocity Impact and Material Behavior
- Advanced materials and composites
- Astro and Planetary Science
- Metal and Thin Film Mechanics
- Metallurgical Processes and Thermodynamics
- Molecular Junctions and Nanostructures
- Intermetallics and Advanced Alloy Properties
- Adversarial Robustness in Machine Learning
Lanzhou University of Technology
2019-2025
University of Science and Technology of China
2021-2025
Gansu Academy of Sciences
2022-2025
Southeast University
2016-2024
China Southern Power Grid (China)
2023-2024
Gannan Normal University
2024
Guangxi Hydraulic Power Machinery Research Institute
2023
Waubonsee Community College
2023
Nanjing University of Chinese Medicine
2023
Jiangsu University of Science and Technology
2022
The fabrication of intrinsic carbon defects is usually tangled with doping effects, and the identification their unique roles in catalysis remains a tough task. Herein, K+ -assisted synthetic strategy developed to afford porous (K-defect-C) abundant complete elimination heteroatom via direct pyrolysis -confined metal-organic frameworks (MOFs). Positron-annihilation lifetime spectroscopy, X-ray absorption fine structure measurement, scanning transmission electron microscopy jointly illustrate...
Thermosetting polymer materials with excellent mechanical properties are highly promising in cryogenic engineering applications. However, the research on toughening mechanism of thermosetting at temperatures is always difficult. Herein, one type high strength hyperbranched epoxy composite was successfully fabricated, and correlation between microstructure (free volume) HPB/epoxy composites studied. To disclose correlations microstructures for these composites, positron annihilation lifetime...
Using the newly developed positron annihilation lifetime spectroscopy (PALS) facility with a high count rate up to 3000 cps, in situ PALS experiments were performed for first time on continuous stretching process of polymers quantitatively analyze minute-scale evolution free-volume holes. According stress–strain relationship and results four types polyethylenes different crystallinities, tensile could be divided into distinct stages: elastic, initial nonlinear (until yield point), postyield,...
Friction represents a major energy dissipation mode, yet the atomistic mechanism of how friction converts mechanical motion into heat remains elusive. It has been suggested that excess phonons are mainly excited at washboard frequency, fundamental frequency which relative excites interface atoms, and subsequent thermalization these nonequilibrium completes process. Through combined atomic force microscopy measurements modeling, here we show nonlinear interactions between sliding tip...
Controlling friction force and thermal conductance at solid/solid interface is of great importance but remains a significant challenge. In this work, we propose method to control the matching degree phonon spectra through modifying atomic mass contact materials, thereby regulating interfacial conductance. Results Debye theory molecular dynamics simulations show that cutoff frequency spectrum decreases with increasing mass. Thus, two surfaces equal have same vibrational characteristics, so...
The adhesion problem of the liquid aluminum (Al) and solid surfaces in production process has not been completely solved. In this paper, by performing molecular dynamic simulations, we first establish models composed liquid-Al/Al liquid-Al/silicon (Si) systems, which region temperature is from 100 K to 800 K. Then, dependence between force qualitatively investigated. mechanism atoms explored terms their diffusion behavior. results show that there an opposite effect on properties interface...
This work investigates the coupling effect of structural lubrication and thermal excitation on phononic friction between black phosphorus (BP) layers. As rotation angle increases from commensurate to incommensurate states, gradually decreases at any temperature. However, role temperature in depends commensurability. For a less than 10°, increasing leads decrease due excitation. Conversely, when exceeds elevated results an increase collision. At critical higher temperatures lead reduced...
During the sinusoidal loading process of SL MoS 2 , when excitation frequency is equal to natural and its harmonics, it will cause primary resonance sub-harmonic resonance, respectively, resulting in local minima fatigue life.
The problem of the adhesion aluminum slag to inner wall a vacuum ladle is essential but has not been addressed. Using high-temperature wettability experimental setup, this paper investigates mechanism interfacial wettability, adhesion, and penetration between Na3AlF6-Al2O3-CaF2 cryolite-based molten salt SiC refractory substrate. composition was determined based on obtained in transfer during electrolysis process. We mainly study effects different Al2O3 contents temperatures contact angle...
Herein, we explore the low-cycle fatigue properties of phosphorene in zigzag and armchair directions as well their phonon energy dissipation. The results indicate that direction possesses a life higher than direction. Moreover, is negatively correlated with both excitation frequency amplitude. phenomenon stress accumulation occurs during process until interatomic bonds break to produce cracks. In addition, efficiency rises increases, lower. As amplitude increase, number in-plane acoustic...
Traditionally, strain-induced moiré patterns at the friction interface can produce superlubrication. Here, we construct on surface of a two-layer MoS2 substrate through applying biaxial strain to bottom layer and investigate effect energy dissipation. Results indicate enhances nonmonotonically with an increase strain. Notably, two types frictional dissipation channels have been discovered, corresponding washboard moiré-washboard frequencies. Based this discovery, determine that nonmonotonic...
Abstract Atomistic mechanisms of frictional energy dissipation have attracted significant attention. However, the dynamics phonon excitation and remain elusive for many friction processes. Through systematic fast Fourier transform analyses signals as a silicon tip sliding over graphite surface at different angles velocities, we experimentally demonstrate that mainly excites non-equilibrium phonons washboard frequency its harmonics. Using molecular simulations, further disclose phononic...
Although the friction characteristics under different contact conditions have been extensively studied, mechanism of phonon transport at structural lubrication interface is not extremely clear. In this paper, we firstly promulgate that there a 90°-symmetry force depending on rotation angle Si/Si interface, which independent normal load and temperature. It further found interfacial temperature difference incommensurate contacts much larger than in commensurate cases, can be attributed to...