A5100620066- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Zeolite Catalysis and Synthesis
- Metal-Organic Frameworks: Synthesis and Applications
- Covalent Organic Framework Applications
- Mesoporous Materials and Catalysis
- Crystallography and molecular interactions
- Electron and X-Ray Spectroscopy Techniques
- Luminescence and Fluorescent Materials
- Catalytic Processes in Materials Science
- Chemical Synthesis and Characterization
- GaN-based semiconductor devices and materials
- Machine Learning in Materials Science
- Semiconductor Quantum Structures and Devices
- Advanced Electron Microscopy Techniques and Applications
- Advanced Photocatalysis Techniques
- Chalcogenide Semiconductor Thin Films
- Nanomaterials for catalytic reactions
- Organometallic Complex Synthesis and Catalysis
- ZnO doping and properties
- Hydrocarbon exploration and reservoir analysis
- Quantum Dots Synthesis And Properties
- Ga2O3 and related materials
- Advanced Chemical Physics Studies
- Metal and Thin Film Mechanics
Tsinghua University
2005-2024
Shanghai Research Institute of Chemical Industry
2016-2024
Sinopec (China)
2007-2024
East China Normal University
2024
Stockholm University
2017-2024
Ingenierie des Materiaux polymeres
2023
Lanzhou University
2023
Peking University
2010-2022
Netherlands eScience Center
2022
East China University of Science and Technology
2016-2021
Covalent organic frameworks (COFs) hold great promise in molecular separations owing to their robust, ordered and tunable porous network structures. Currently, the pore size of COFs is usually much larger than most small molecules. Meanwhile, weak interlamellar interaction between COF nanosheets impedes preparation defect-free membranes. Herein, we report a series membranes through mixed-dimensional assembly 2D 1D cellulose nanofibers (CNFs). The 0.45-1.0 nm acquired from sheltering effect...
Abstract The construction of 2D and 3D covalent organic frameworks (COFs) from functional moieties for desired properties has gained much attention. However, the influence COFs dimensionality on their functionalities, which can further assist in COF design, never been explored. Now, by selecting designed precursors topology diagrams, porphyrinic (2D‐PdPor‐COF 3D‐PdPor‐COF) are synthesized. By model building Rietveld refinement powder X‐ray diffraction, 2D‐PdPor‐COF crystallizes as sheets...
Abstract Understanding the atomic-scale structural dynamics of phase transformations is crucial for developing materials and tailoring their properties. However, many are obtained as polycrystalline powders with large unit cells and/or complex structures, making it challenging to investigate detailed changes using conventional X-ray diffraction techniques. Here we employ time-resolved three-dimensional electron reveal topotactic reactions that convert extra-large-pore silicate zeolite...
Abstract Although polymers have been studied for well over a century, there are few examples of covalently linked polymer crystals synthesised directly from solution. One-dimensional (1D) covalent that packed into framework structure can be viewed as 1D organic (COF), but making single crystal this has elusive. Herein, by combining labile metal coordination and dynamic chemistry, we discover strategy to synthesise single-crystal metallo-COFs under solvothermal conditions. The is rigorously...
Growth of covalent organic frameworks (COFs) as single crystals is extremely challenging. Inaccessibility open-structured single-crystal COFs prevents the exploration structure-oriented applications. Herein we report for first time a non-interpenetrated COF, LZU-306, which possesses open structure constructed exclusively via assembly. With high void volume 80 %, LZU-306 was applied to investigate intrinsic dynamics reticulated tetraphenylethylene (TPE) individual aggregation-induced-emission...
The marriage of dynamic covalent chemistry (DCC) and coordination is a powerful tool for assembling complex architectures from simple building units. Recently, the synthesis woven organic frameworks (COFs) with topologically fascinating structures has been achieved using this approach. However, scope highly limited there need to discover new pathways that can assemble covalently linked threads into crystalline frameworks. Herein, we have identified branching leading assembly...
Rapid phase elucidation of polycrystalline materials is essential for developing new chemical, pharmaceutical and industrial interest. Yet, the size quantity many crystalline phases are too small routine X-ray diffraction analysis. This has become a workflow bottleneck in development, especially high-throughput synthesis screening. Here we demonstrate application serial rotation electron (SerialRED) identification complex zeolite products. The products were prepared from combination multiple...
Abstract The construction of 2D and 3D covalent organic frameworks (COFs) from functional moieties for desired properties has gained much attention. However, the influence COFs dimensionality on their functionalities, which can further assist in COF design, never been explored. Now, by selecting designed precursors topology diagrams, porphyrinic (2D‐PdPor‐COF 3D‐PdPor‐COF) are synthesized. By model building Rietveld refinement powder X‐ray diffraction, 2D‐PdPor‐COF crystallizes as sheets...
Abstract In this paper, we test predictions of a new theory macroeconomics, called “thermal macroeconomics.” The aims to apply the mathematical structure classical thermodynamics, including analogues temperature and entropy, predict aspects aggregate behaviour populations economic agents without analyzing their detailed interactions. We by comparing its with variety simulated micro-economies in which goods money can be exchanged between agents, confirming theory. paper serves also illustrate...
Two kinds of novel organic microporous polymers TCPs (TCP-A and TCP-B) were prepared by two cost-effective synthetic strategies from the monomer tricarbazolyltriptycene (TCT). Their structure properties characterized FT-IR, solid (13) C NMR, powder XRD, SEM, TEM, gas absorption measurements. TCP-B displayed a high surface area (1469 m(2) g(-1) ) excellent H2 storage (1.70 wt % at 1 bar/77 K) CO2 uptake abilities (16.1 bar/273 K), which makes it promising material for potential application in storage.
A novel crystalline high-silica zeolite with 12×8-membered ring (R) channel system is prepared the aid of 3D electron diffraction (3D ED) technique. crystal same topology as one predicted daughter structures CIT-13 germanosilicate, named ECNU-23 (East China Normal University 23) was coincidentally detected by ED investigation during structure characterization "pure" powder sample existing one-dimension (1D) 10-R ECNU-21. By controlling alkaline-assisted hydrolysis under moderate conditions,...
A new germanosilicate zeolite named SCM-15 (Sinopec Composite Material No. 15), the first containing a 3-dimensional (3D) channel system with interconnected 12-, and 10-ring channels (pore sizes: 6.1×7.2, 6.1×7.4, 5.2×5.9 Å), has been synthesized using neutral 4-pyrrolidinopyridine as organic structure-directing agents (OSDAs). Its structure determined by combining single-crystal electron diffraction (SCED) synchrotron powder X-ray (SPXD) data. The unique open framework of is related to that...
ZSM-22 zeolite nanosheets with a thickness of about 10 nm were synthesized through hydrothermal crystallization without any special additives. The formation the nanosheet crystals follows multi-step mechanism aggregation and fusion elementary nanorods. inhomogeneous distribution aluminum might be key factor that induces crystals.
Noncovalent interactions are essential in the formation and properties of a diverse range hybrid materials. However, reliably identifying noncovalent nanocrystalline materials remains challenging using conventional methods such as X-ray diffraction spectroscopy. Here, we demonstrate that accurate atomic positions including hydrogen atoms can be determined three-dimensional electron (3D ED), from which entire aluminophosphate material SCM-34 directly visualized. The protonation states both...
Abstract SCM‐14 (Sinopec Composite Material No. 14), a new stable germanosilicate zeolite with 12×8×8‐ring channel system, was synthesized using commercially available 4‐pyrrolidinopyridine as organic structure‐directing agents (OSDAs) in fluoride medium. The framework structure of determined rotation electron diffraction (RED), and refined against synchrotron X‐ray powder (SXPD) data for both as‐made calcined materials. is closely related to that three known zeolites: mordenite ( MOR ),...
A bicyclooxacalixarene cage with triangular prism structure was synthesized by a one-pot SNAr reaction. The of the oxacalixarene 1 characterized NMR, MS spectra, and X-ray crystal analyses. In solid state, molecular assembled into an interlaced porous network structure. Gas adsorption studies indicated that exhibited high CO2/N2 selectivity 106.
Serial electron diffraction (SerialED), which applies a snapshot data acquisition strategy for each crystal, was introduced to tackle the problem of radiation damage in structure determination beam-sensitive materials by three-dimensional (3DED). The SerialED can be realized using both transmission and scanning microscopes (TEM/STEM). However, current workflow based on STEM setups requires special external devices software, limits broader adoption. Here, we present simplified experimental...
Understanding the atomic scale structural dynamics of phase transformations is crucial for developing new materials and tailoring properties materials. However, many are obtained as polycrystalline powders with large unit cells and/or complex structures, making it challenging to investigate detailed changes using conventional X-ray diffraction techniques. Here, we employ time-resolved 3D electron (3D ED) unravel topotactic reactions extra-large pore silicate zeolites ECNU-45 ECNU-46....