A5020072564- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Metal-Organic Frameworks: Synthesis and Applications
- Polyoxometalates: Synthesis and Applications
- High Altitude and Hypoxia
- Microstructure and mechanical properties
- Ferroelectric and Piezoelectric Materials
- Advanced Nanomaterials in Catalysis
- Cancer, Hypoxia, and Metabolism
- Lanthanide and Transition Metal Complexes
- Crystallography and molecular interactions
- Magnetism in coordination complexes
- Force Microscopy Techniques and Applications
- Nanocluster Synthesis and Applications
- Heme Oxygenase-1 and Carbon Monoxide
- Organic Light-Emitting Diodes Research
- Acoustic Wave Resonator Technologies
- Metal and Thin Film Mechanics
- High Entropy Alloys Studies
- Titanium Alloys Microstructure and Properties
- Chemical Synthesis and Characterization
- Luminescence and Fluorescent Materials
- Boron and Carbon Nanomaterials Research
- MXene and MAX Phase Materials
- Neuroscience of respiration and sleep
Xi'an Jiaotong University
2015-2025
Anhui Medical University
2021-2024
Suqian University
2024
Shangqiu Normal University
2011-2022
Northwest A&F University
2019-2022
University of Cambridge
2020
Shangqiu Institute of Technology
2014-2019
Karlsruhe Institute of Technology
2006-2018
Massachusetts Institute of Technology
2015-2018
Luxembourg Institute of Science and Technology
2018
Flexible ferroelectrics High-quality ferroelectric materials, which polarize in response to an electric field, are usually oxides that crack when bent. Dong et al. found high-quality membranes of barium titanate surprisingly flexible and super-elastic. These films accommodate large strains through dynamic evolution nanodomains during deformation. This discovery is important for developing more robust devices. Science , this issue p. 475
Atomistic simulations of dislocation mobility reveal that body-centered cubic (BCC) high-entropy alloys (HEAs) are distinctly different from traditional BCC metals. HEAs concentrated solutions in which composition fluctuation is almost inevitable. The resultant inhomogeneities, while locally promoting kink nucleation on screw dislocations, trap them against propagation with an appreciable energy barrier, replacing as the rate-limiting mechanism. Edge dislocations encounter a similar...
Abstract The ultralow friction properties of 2D materials present significant potential for energy‐saving application. Atomic force microscopy experiments on the moiré superlattice stacked reveal that, beyond atomic stick‐slip dynamics, behaviors at scale introduce a new dominant energy dissipation mechanism. However, understanding these remains challenging due to complex interplay between and effects. Here, through large‐scale molecular dynamics simulations tip scanning graphene/h‐BN...
Abstract Due to its high diffusivity, hydrogen is often considered a weak inhibitor or even promoter of dislocation movements in metals and alloys. By quantitative mechanical tests an environmental transmission electron microscope, here we demonstrate that after exposing aluminium hydrogen, mobile dislocations can lose mobility, with activating stress more than doubled. On degassing, the locked be reactivated under cyclic loading move stick-slip manner. However, relocking thereafter requires...
Friction and wear remain the primary modes for energy dissipation in moving mechanical components. Superlubricity is highly desirable saving environmental benefits. Macroscale superlubricity was previously performed under special environments or on curved nanoscale surfaces. Nevertheless, macroscale has not yet been demonstrated ambient conditions surfaces, except humid air produced by purging water vapor into a tribometer chamber. In this study, tribological system fabricated using...
Controlling, and in many cases minimizing, friction is a goal that has long been pursued history. From the classic Amontons-Coulomb law to recent nanoscale experiments, steady-state found be an inherent property of sliding interface, which typically cannot altered on demand. In this work, we show graphene sheet can tuned reversibly by simple mechanical straining. particular, applying tensile strain (up 0.60%), are able achieve superlubric state (coefficient nearly 0.001) suspended graphene....
Summary Resistant starch ( RS ), a type of dietary fibre, plays an important role in human health; however, the content most modern processed starchy foods is low. Cereal starch, when structurally manipulated through modified biosynthetic pathway to greatly increase amylose content, could be food source . Transgenic studies have previously revealed requirement simultaneous down‐regulation two branching enzyme SBE ) II isoforms both located on long arm chromosome 2, namely SBEII and b ,...
Abstract Self‐assembled membranes with periodic wrinkled patterns are the critical building blocks of various flexible electronics, where wrinkles usually designed and fabricated to provide distinct functionalities. These typically metallic organic materials good ductility that tolerant complex deformation. However, preparation oxide membranes, especially those intricate wrinkle patterns, is challenging due their inherently strong covalent or ionic bonding, which leads material crazing...
Abstract Alloying elements have great influence on mechanical properties of metals. Combining dislocation characterization and in-situ transmission electron microscope straining at ambient liquid-nitrogen temperature in high-purity titanium Ti-5at%Al, we investigated the modulation Al behaviours as changed. It reveals that segregation edge cores Ti-5at%Al generates strong obstacles, promoting room cross-slips. However, effect reducing stacking-fault energy (SFE) decreasing is significant....
Abstract The ultrahigh flexibility and elasticity achieved in freestanding single-crystalline ferroelectric oxide membranes have attracted much attention recently. However, for antiferroelectric oxides, the limit fundamental mechanism their are still not explored clearly. Here, we successfully fabricate PbZrO 3 by a water-soluble sacrificial layer technique. They exhibit good antiferroelectricity commensurate/incommensurate modulated microstructure. Moreover, they also shape recoverability...
Curium lies at the center of actinide series and has a half-filled shell with seven 5 f electrons spatially residing inside its radon core. As function pressure, curium exhibits five different crystallographic phases up to 100 gigapascals, which all but one are also found in preceding element, americium. We describe here structure curium, Cm III, monoclinic symmetry, space group C2/c , intermediate pressures (between 37 56 gigapascals). Ab initio electronic calculations agree observed...
Superelasticity (SE) in bulk materials is known to originate from the structure-changing martensitic transition which provides a volumetric thermodynamic driving force for shape recovery. On other hand, structure-invariant deformation processes, such as twinning and dislocation slip, result plastic deformation, cannot provide We use molecular-dynamics simulations show that some bcc metal nanowires exhibit SE by ``reversible'' mechanism, contrast above conventional point of view. this...
Two types of rare sandwich-type germanomolybdates [Na(12)(H(2)O)(36)][Cu(2)(beta-Y-GeMo(9)O(33))(2)].3H(2)O (1), [N(CH(3))(4)](4) [Na(6)(H(2)O)(24)][Cr(2)(beta-Y-GeMo(9)O(33))(2)].7H(2)O (2), and [Na(11)(H(2)O)(25)]H[M(4)(H(2)O)(2)(alpha-B-GeMo(9)O(34))(2)].6H(2)O (M = Ni(II) for 3, M Mn(II) 4 Co(II) 5) have been synthesized characterized by elemental analyses, ICP spectra, IR spectroscopy, UV thermogravimetry (TG) analyses (for 1-3), X-ray photoelectron spectroscopy (XPS) 1 3), powder...
Three thermally activated delayed fluorescence cationic cuprous complexes [Cu(POP) (ECAF)]PF6 (1, POP = bis(2-diphenylphosphinophenyl)ether, ECAF 9,9-bis(9-ethylcarbazol-3-yl)-4,5-diazafluorene), (EHCAF)]PF6 (2, EHCAF 9,9-bis(9-ethylhexylcarbazol-3-yl)-4,5-diazafluorene), and (PCAF)]PF6 (3, PCAF 9,9-bis(9-phenylcarbazaol-3-yl)-4,5-diazafluorene) with bipolar 4,5-diazafluorene ligand substituted by bis-carbazole have been successfully prepared, their UV absorption, photoluminescent...
We study, by means of an atomistic toy model, the interplay ferroelastic twin patterns and electrical polarization. Our molecular dynamics simulations reproduce polarity in straight walls as observed experimentally. show, making contact with continuum theory, that effect is governed linear flexoelectricity. Complex patterns, very high densities kinks and/or junctions, produce winding structures dipolar field, which are reminiscent polarization vortices. By a ``cold shearing'' technique, we...