A5073692835- Metal-Organic Frameworks: Synthesis and Applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Luminescence and Fluorescent Materials
- Nanoplatforms for cancer theranostics
- Boron and Carbon Nanomaterials Research
- Magnetism in coordination complexes
- Covalent Organic Framework Applications
- Crystallography and molecular interactions
- Conducting polymers and applications
- Advanced Sensor and Energy Harvesting Materials
- Machine Learning in Materials Science
- Advanced Nanomaterials in Catalysis
- Gas Sensing Nanomaterials and Sensors
- MXene and MAX Phase Materials
- Cellular and Composite Structures
- Nanocluster Synthesis and Applications
- Membrane Separation and Gas Transport
- Electrospun Nanofibers in Biomedical Applications
- Molecular Sensors and Ion Detection
- Supramolecular Self-Assembly in Materials
- Lanthanide and Transition Metal Complexes
- Supercapacitor Materials and Fabrication
- Magnesium Alloys: Properties and Applications
- Corrosion Behavior and Inhibition
University of Oxford
2016-2025
Science Oxford
2017-2020
Oxfam
2014-2019
University of Cambridge
2005-2012
University of California, Santa Barbara
2009
General Research Institute for Nonferrous Metals (China)
2008
Wichita State University
2005
Google (United States)
2005
Nanyang Technological University
2002-2003
University of Technology Malaysia
2000
As synthesised ZIF-8 nanoparticles (size ∼ 60 nm and specific surface area 1300–1600 m2 g−1) were directly incorporated into a model polymer matrix (Matrimid® 5218) by solution mixing. This produces flexible transparent membranes with excellent dispersion of (up to loadings 30 wt%) good adhesion within the matrix, as confirmed scanning electron microscopy, dynamic mechanical thermal analysis gas sorption studies. Pure (H2, CO2, O2, N2 CH4) permeation tests showed enhanced permeability mixed...
Laser ablation MC-ICP-MS allows in situ strontium isotope data to be obtained for incrementally formed bioapatites such as enamel with extremely high spatial resolution. Here, we provide a large-scale application of the method comparing ...Understanding mobility and landscape use is important reconstructing subsistence behavior, range, group size, it may contribute our understanding phenomena dynamics biological cultural interactions between distinct ...
Abstract Hybrid glasses connect the emerging field of metal-organic frameworks (MOFs) with glass formation, amorphization and melting processes these chemically versatile systems. Though inorganic zeolites collapse around transition melt at higher temperatures, relationship between has so far not been investigated. Here we show how heating MOFs zeolitic topology first results in a low density ‘perfect’ glass, similar to those formed ice, silicon disaccharides. This order–order leads...
We show that ZIF-4, a metal-organic framework (MOF) with zeolitic structure, undergoes crystal--amorphous transition on heating to 300 $^\circ$C. The amorphous form, which we term a-ZIF, is recoverable ambient conditions or may be converted dense crystalline phase of the same composition by 400 Neutron and X-ray total scattering data collected during amorphization process are used as basis for reverse Monte Carlo refinement an atomistic model structure a-ZIF. best understood in terms...
Using Brillouin scattering, we measured the single-crystal elastic constants (C(ij)'s) of a prototypical metal-organic framework (MOF): zeolitic imidazolate (ZIF)-8 [Zn(2-methylimidazolate)(2)], which adopts sodalite topology and exhibits large porosity. Its C(ij)'s under ambient conditions are (in GPa) C(11)=9.522(7), C(12)=6.865(14), C(44)=0.967(4). Tensorial analysis reveals complete picture anisotropic elasticity in cubic ZIF-8. We show that ZIF-8 has remarkably low shear modulus G(min)...
We present an unambiguous identification of low-frequency terahertz vibrations in the archetypal imidazole-based metal-organic framework (MOF) materials: ZIF-4, ZIF-7, and ZIF-8, all which adopt a zeolite-like nanoporous structure. Using inelastic neutron scattering synchrotron radiation far-infrared absorption spectroscopy, conjunction with density functional theory (DFT), we have pinpointed major sources vibrational modes. Ab initio DFT calculations revealed complex nature collective THz...
Film deposition is an enabling technology for integration of novel functional materials into real-world practical applications. We report both the anodic and cathodic electrochemical film UiO-66, a prototype highly stable, zirconium-based metal–organic frameworks, using zirconium foil as only metal source. The fundamentally different formation mechanisms at cathode anode result in significantly coating adhesion strength, mainly due to oxide serving bridging layer anode. patterned capability...
We report the reversible pressure-induced amorphization of a zeolitic imidazolate framework (ZIF-4, [Zn(Im)(2)]). This occurs irrespective pore occupancy and takes place via novel high pressure phase (ZIF-4-I) when solvent molecules are present in pores. A significant reduction bulk modulus upon evacuation is also observed for both ZIF-4 ZIF-4-I.
A fast and efficient mechanosynthesis (ball-milling) method of preparing amorphous zeolitic imidazolate frameworks (ZIFs) from different starting materials is discussed. Using X-ray total scattering, N(2) sorption analysis, gas pycnometry, these are indistinguishable one another temperature-amorphized ZIFs. Gas analysis also confirms that they nonporous once formed, in contrast to activated ZIF-4, which displays interesting gate-opening behavior. Nanoparticles a prototypical nanoporous...
Abstract The I 2 ‐sorption and ‐retention properties of several existing zeolitic imidazolate frameworks (ZIF‐4, ‐8, ‐69) a novel framework, ZIF‐mnIm ([Zn(mnIm) ]; mnIm=4‐methyl‐5‐nitroimidazolate), have been characterised using microanalysis, thermogravimetric analysis X‐ray diffraction. topologically identical ZIF‐8 ([Zn(mIm) mIm=2‐methylimidazolate) display similar sorption abilities, though strikingly different guest‐retention behaviour upon heating. We discover that this guest retention...
We report a new 2-D inorganic–organic framework material, MnDMS [Mn 2,2-dimethylsuccinate], featuring weakly bound hybrid layers in its bulk crystals that can be readily exfoliated into nanosheets via ultrasonication. The fully correspond to unilamellar thickness of about 1 nm, while the partially (multilayer films) exhibit typical on order 10 nm. used atomic force microscopy characterize their surface topography and map variation nanomechanical properties across delaminated nanosheets....
Each the same: A stable, recoverable, amorphous phase (see topology model) was produced by heating each of four different zeolitic imidazolate frameworks ZIF-1, -3, -4, and Co-ZIF-4. By comparing nanoindentation results, density measurements, X-ray total scattering it is concluded that structure equivalent in case. Amorphization only observed ZIFs encompassing unsubstituted ligands.
We describe a surfactant-free bottom-up synthesis of 2D stable MOF nanosheets, NUS-8(Zr or Hf), <italic>via</italic> the modulated hydrothermal (MHT) approach. These NUS-8 nanosheets demonstrate several prevailing advantages including superior chemical/thermal stabilities and enzyme-specific catalytic activities toward thioether oxidation into sulfones.
Acidic modulating ligands have been shown to stabilize UiO metal-organic frameworks against structural collapse under ball-milling.
Abstract The dense, anhydrous zeolitic imidazolate frameworks (ZIFs), Zn(Im) 2 ( 1 ) and LiB(Im) 4 ), adopt the same zni topology differ only in terms of inorganic species present their structures. Their mechanical properties (specifically Young’s bulk moduli, along with hardness) have been elucidated by using high pressure, synchrotron X‐ray diffraction, density functional calculations nanoindentation studies. Under hydrostatic framework undergoes a phase transition at 1.69 GPa, which is...
Outstanding functional tunability underpinning metal-organic framework (MOF) confers a versatile platform to contrive next-generation chemical sensors, optoelectronics, energy harvesters and converters. We report rare exemplar of porous 2D nanosheet material, constructed from an extended 3D MOF structure. develop rapid supramolecular self-assembly methodology at ambient conditions, synthesize readily-exfoliatable nanosheets, functionalized in situ by adopting the Guest@MOF (Host) strategy....
A synergistic approach is described to engineer supramolecular hybrid materials based on metal-organic frameworks, encompassing HKUST-1 nanoparticles formed in situ, coexisting with an electrically conducting gel fiber network. The following findings are made: i) multistimuli-responsive structural transformation via reversible sol-gel switching and ii) radical conversion of a soft into mechanically malleable, viscoelastic matter.
We use density functional theory to reveal the detailed elastic properties of two topical ZIF materials comprising same chemical composition but different crystalline structures. ZIF-4 was found exhibit a negative Poisson's ratio, representing first ‘auxetic-ZIF’ be identified.