A5072211747- Metal-Organic Frameworks: Synthesis and Applications
- Material Dynamics and Properties
- Metallic Glasses and Amorphous Alloys
- Glass properties and applications
- Theoretical and Computational Physics
- Magnetism in coordination complexes
- Liquid Crystal Research Advancements
- Lanthanide and Transition Metal Complexes
- X-ray Diffraction in Crystallography
- Advanced ceramic materials synthesis
- Crystallography and molecular interactions
- Corrosion Behavior and Inhibition
- Cultural Heritage Materials Analysis
- Hydrogen embrittlement and corrosion behaviors in metals
- High-Temperature Coating Behaviors
- Nonlinear Optical Materials Research
- Pigment Synthesis and Properties
- High Temperature Alloys and Creep
- Additive Manufacturing Materials and Processes
- Intermetallics and Advanced Alloy Properties
- Advanced Malware Detection Techniques
- Extraction and Separation Processes
- Metal and Thin Film Mechanics
- Analytical Chemistry and Chromatography
- Mesoporous Materials and Catalysis
Changchun University of Technology
2023-2024
University of Cambridge
2009-2024
Aalborg University
2015-2022
University of Shanghai for Science and Technology
2022
Shanghai University of Engineering Science
2013-2021
Electric Power Research Institute
2017-2020
Division of Chemistry
2016-2019
Swedish Chemicals Agency
2017-2019
Shandong University
2013-2018
Bioscience (China)
2017
To date, only several microporous, and even fewer nanoporous, glasses have been produced, always via post synthesis acid treatment of phase separated dense materials, e.g. Vycor glass. In contrast, high internal surface areas are readily achieved in crystalline such as metal-organic frameworks (MOFs). It has recently discovered that a new family melt quenched can be produced from MOFs, though they thus far lacked the accessible intrinsic porosity their precursors. Here, we report first...
The majority of research into metal-organic frameworks (MOFs) focuses on their crystalline nature. Recent has revealed solid-liquid transitions within the family, which we use here to create a class functional, stable and porous composite materials. Described herein is design, synthesis, characterisation MOF crystal-glass composites, formed by dispersing MOFs MOF-glass matrix. coordinative bonding chemical structure MIL-53 phase are preserved ZIF-62 glass Whilst separated phases, interfacial...
The liquid and glass states of metal-organic frameworks (MOFs) have recently become interest due to the potential for liquid-phase separations ion transport, alongside fundamental nature latter as a new, fourth category melt-quenched glass. Here we show that MOF state can be blended with another component, resulting in domain structured single, tailorable transition. Intra-domain connectivity short range order is confirmed by nuclear magnetic resonance spectroscopy pair distribution function...
Metal-organic framework (MOF) glasses are a newly emerged family of melt-quenched glasses. Recently, several intriguing features, such as ultrahigh glass-forming ability and low liquid fragility, have been discovered in number zeolitic imidazolate frameworks (ZIFs) that subset MOFs. However, the fracture behavior ZIF has not explored. Here we report an observation both cracking pattern shear bands induced by indentation representative glass, is, ZIF-62 glass (ZnIm1.68bIm0.32). The banding is...
Recently, we observed an unusual non-monotonic glass relaxation phenomenon, i.e., the three-step sub-T(g) in hyperquenched CuZrAl ribbons [L. N. Hu and Y. Z. Yue, Appl. Phys. Lett. 98, 081904 (2011)]. In present work, reveal origin of this abnormal behavior by studying cooling rate dependence enthalpy two metallic glasses. For Cu46Zr46Al8 pattern exhibits a trend with annealing temperature only when are fabricated below critical rate. La55Al25Ni20 activation energy for onset also varies...
In the present work, we show experimental evidence for dynamic fragile-to-strong (F-S) transition in a series of CuZr(Al) glass-forming liquids (GFLs). A detailed analysis dynamics 98 indicates that F-S occurs around Tf-s ≈ 1.36 Tg. Using hyperquenching-annealing-x-ray scattering approach, have observed three-stage evolution pattern medium-range ordering (MRO) structures during transition, indicating dramatic change MRO clusters upon cooling. The GFLs is attributed to competition among...
It is known that both the fragile-to-strong (F–S) transition and relaxation processes occur in numerous supercooled liquids upon cooling toward glass temperature. The key question whether how these two dynamic are correlated. Here, we show a direct link between for metallic glass-forming (MGFLs) with different fragilities also nonmetallic liquids. By comparing F–S extent parameter f r characterizes competition α slow β relaxations, have discovered negative exponential connection parameters...
We study the dynamic behavior of CuZr-based melts well above liquidus temperature. The results show a discontinuous change in viscosity during cooling, which is attributed to an underlying liquid-liquid phase transition (LLPT) these melts. LLPT further verified by thermodynamic response same temperature region. find that Cu46Zr46Al8 melt reversible 1350 K upon repeated heating and cooling. Based on concept fluid cluster metallic melts, structural from strongly ordered high-density liquids...
Pure metal–organic framework (MOF) layers deposited on porous supports are important candidates for molecular sieving membranes, but their performance usually deviates from theoretical estimations. Here, we combine step-wise scanning electron microscopy imaging, time-resolved synchrotron X-ray scattering, terahertz infrared spectroscopy, and density functional theory calculation to investigate the ZIF-8 membrane formation two types (polydopamine TiO2) of functionalized supports. Though...
A series of TiN/AlN-Ni multilayer films with different modulation layer thicknesses were prepared by magnetron sputtering. Their microstructures and mechanical properties characterized X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission (HRTEM). Therein, fracture toughness was determined indentation method. The hardness elastic modulus all multilayers are greatly improved introducing an AlN-Ni layer. When the modulation-layer thickness is 2.4 nm, highest...
In this work, we explore the thermodynamic evolution in a melt-quenched metal–organic framework glass, formed from ZIF-62 upon heating to melting point (<italic>T</italic><sub>m</sub>), and subsequent enthalpy relaxation.
We report on a correlation between the supercooled liquid (SL) relaxation and glass Poisson's ratio (v) by comparing activation energy (r) of α slow β relaxations v values for both metallic nonmetallic glasses. generally increases with an increase in r this relation can be described empirical function = 0.5 - A*exp(-B*r), where A B are constants. This might imply that plasticity is associated competition SLs. The underlying physics lies heredity structural heterogeneity from to glass. work...
We investigate the sub-T(g) relaxation patterns (RPs) in binary and quaternary Cu-based glass ribbons (GRs) by using hyperquenching-sub-T(g) annealing-calorimetric approach. This study contributes to revealing structural or dynamic evolution liquids related observed three-stage processes GRs. In this work, we have achieved following three findings. First, abnormal behavior is not a general phenomenon for metallic glasses could be simply predicted large difference enthalpy of mixing between...
DUT-67 is a Zr-based metal–organic framework (MOF) that incorporates thiophene dicarboxylic acid linkers. In this study, we observed underwent striking structural order–disorder transition upon dynamic heating process. We established correlation between thermal responses and changes in during through both calorimetric analysis characterization at various length scales. It was discovered the chemical integrity of linkers remained intact heating. The morphology preserved after changes, while...
We synthesized two series of bimetallic (zinc and cobalt) zeolitic imidazolate frameworks (ZIF-62) under different solvothermal conditions. It is found that the structure derived ZIF crystals highly sensitive to synthesis One possesses standard ZIF-62 structure, whereas other has a mixed composed both an unknown one. The exhibits slight negative deviation from linearity melting temperature (Tm) glass transition (Tg) with substitution Co for Zn. In contrast, new displays stronger deviation....
The mechanical properties and corrosion resistance of SA508-4Ni-Cr-Mo low carbon alloy steel are elucidated using tensile testing, Charpy impact fracture surface analysis in-situ electrochemical noise (EN) technique. metallographic structures characterized by microscope combining with transmission electron (TEM), the morphology is scanning (SEM). intercritical heat treatment (IHT) introduced to SA508-4 steel. experimental observations reveal that structure fine uniform after different...
We report a new approach, i.e., the hyperquenching-calorimetric by which activation energy of slow β relaxation (Eβ) in metallic glasses can be determined. This method is based on correlations among kinetic liquid fragility index (m), glass transition temperature (Tg), characteristic fictive (Tf,c), and for sub-Tg enthalpy relaxation. Tf,c at Eβ equal to onset glasses. The linear Tf,c/Tg ∼ m relation attributed link between contribution entire process explained terms potential landscape....
We study the fragile-to-strong (F-S) transition of metallic glass-forming liquids (MGFLs) by measuring thermal response during annealing and dynamic heating La55Al25Ni5Cu15 glass ribbons fabricated at different cooling rates. find that glasses in intermediate regime rates (15-25 m/s) exhibit an anomalous crystallization behavior upon reheating as compared to formed other This implies existence a thermodynamic F-S transition, could be used alternative method for detecting MGFLs, sheds light...