ORCID Profile
0000-0001-5509-6706
Current Organisations
The University of Manchester School of Materials
,
University of Manchester
,
University of Oxford
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Publisher: American Chemical Society (ACS)
Date: 03-03-2015
DOI: 10.1021/CM504765Z
Publisher: IOP Publishing
Date: 08-2008
Publisher: Elsevier
Date: 2008
Publisher: Wiley
Date: 07-06-2021
Abstract: Industrial purification of propylene and ethylene requires cryogenic distillation and selective hydrogenation over palladium catalysts to remove propane, ethane and/or trace amounts of acetylene. Here, we report the excellent separation of equimolar mixtures of propylene ropane and ethylene/ethane, and of a 1/100 mixture of acetylene/ethylene by a highly robust microporous material, MFM‐520, under dynamic conditions. In situ synchrotron single crystal X‐ray diffraction, inelastic neutron scattering and analysis of adsorption thermodynamic parameters reveal that a series of synergistic host–guest interactions involving hydrogen bonding and π⋅⋅⋅π stacking interactions underpin the cooperative binding of alkenes within the pore. Notably, the optimal pore geometry of the material enables selective accommodation of acetylene. The practical potential of this porous material has been demonstrated by fabricating mixed‐matrix membranes comprising MFM‐520, Matrimid and PIM‐1, and these exhibit not only a high permeability for propylene (≈1984 Barrer), but also a separation factor of 7.8 for an equimolar mixture of propylene ropane at 298 K.
Publisher: IOP Publishing
Date: 02-05-2014
DOI: 10.1088/0957-4484/25/21/215705
Abstract: The composition of InxGa1 - xN nanorods grown by molecular beam epitaxy with nominal x = 0.5 has been mapped by electron microscopy using Z-contrast imaging and x-ray microanalysis. This shows a coherent and highly strained core-shell structure with a near-atomically sharp boundary between a Ga-rich shell (x ∼ 0.3) and an In-rich core (x ∼ 0.7), which itself has In- and Ga-rich platelets alternating along the growth axis. It is proposed that the shell and core regions are lateral and vertical growth sectors, with the core structure determined by spinodal decomposition.
Publisher: American Chemical Society (ACS)
Date: 16-10-2017
Abstract: Laminar membranes of two-dimensional materials are excellent candidates for applications in water filtration due to the formation of nanocapillaries between in idual crystals that can exhibit a molecular and ionic sieving effect, while allowing high water flux. This approach has been exemplified previously with graphene oxide, however these membranes suffer from swelling when exposed to liquid water, leading to low salt rejection and reducing their applicability for desalination applications. Here, we demonstrate that by producing thin (∼5 μm) laminar membranes of exfoliated molybdenum disulfide (MoS
Publisher: American Chemical Society (ACS)
Date: 15-02-2022
Publisher: Oxford University Press (OUP)
Date: 03-01-2008
DOI: 10.1017/S1431927608080148
Abstract: Aberration correction leads to a substantial improvement in the directly interpretable resolution of transmission electron microscopes. Correction of the aberrations has been achieved electron-optically through a hexapole-based corrector and also indirectly by computational analysis of a focal or tilt series of images. These direct and indirect methods are complementary, and a combination of the two offers further advantages. Materials characterization has benefitted from the reduced delocalization and higher resolution in the corrected images. It is now possible, for ex le, to locate atomic columns at surfaces to higher accuracy and reliability. This article describes the JEM-2200FS in Oxford, which is equipped with correctors for both the image-forming and probe-forming lenses. Ex les of the use of this instrument in the characterization of nanocrystalline catalysts are given together with initial results combining direct and indirect methods. The double corrector configuration enables direct imaging of the corrected probe, and a potential confocal imaging mode is described. Finally, modifications to a second generation instrument are outlined.
Publisher: EDP Sciences
Date: 2014
Publisher: American Chemical Society (ACS)
Date: 20-04-2020
Publisher: Springer Science and Business Media LLC
Date: 25-05-2020
Publisher: Wiley
Date: 08-06-2009
Publisher: Elsevier BV
Date: 11-2014
Publisher: Springer Science and Business Media LLC
Date: 21-09-2021
Publisher: American Chemical Society (ACS)
Date: 25-01-2019
Publisher: Elsevier BV
Date: 05-2008
Publisher: American Chemical Society (ACS)
Date: 12-01-2016
Publisher: IOP Publishing
Date: 23-02-2021
Abstract: Fe 3 GeTe 2 is a layered crystal which has recently been shown to maintain its itinerant ferromagnetic properties even when atomically thin. Here, differential phase contrast scanning transmission electron microscopy is used to investigate the domain structure in a Fe 3 GeTe 2 cross-sectional lamella at temperatures ranging from 95 to 250 K and at nanometre spatial resolution. Below the experimentally determined Curie temperature ( T C ) of 191 K, stripe domains magnetised along 〈0001〉, bounded with 180 ◦ Bloch type domain walls, are observed, transitioning to mixed Bloch−Néel type where the cross-sectional thickness is reduced below 50 nm. When warming towards T C , these domains undergo slight restructuring towards uniform size, before abruptly fading at T C . Localised loss of ferromagnetic order is seen over time, hypothesised to be a frustration of ferromagnetic order from ambient oxidation and basal cracking, which could enable selective modification of the magnetic properties for device applications.
Publisher: IOP Publishing
Date: 08-2008
Publisher: Elsevier BV
Date: 09-2014
DOI: 10.1016/J.ULTRAMIC.2014.04.001
Abstract: Energy-dispersive X-ray (EDX) spectroscopy in the scanning transmission electron microscope (STEM) has been used to demonstrate the presence of size-dependent compositional variation for L12-structured Ni3Al-type gamma-prime (γ') precipitates within a commercial RR1000 Ni-based superalloy. This semi-quantitative elemental analysis has been achieved using electrochemical extraction of the γ' precipitates from the γ matrix. The applicability of this approach to size-dependent compositional analysis of precipitates was confirmed by a comparison of the size distribution for the extracted precipitates with those present in traditional electropolished foil specimens in the size range 20-250nm. By applying suitable thickness-dependent absorption-corrections we have demonstrated that the composition of γ' precipitates in our material depends on the size of the precipitate in the range of 5nm to 3μm. In particular, the Al content was observed to increase in smaller γ' precipitates while Ti and Ta contents are constant for all sizes of precipitate. Hf was observed to be present only in the largest precipitates. This type of local compositional information provides invaluable input to assess the accuracy of microstructural modelling for these complex alloys and provides new evidence supporting the importance of anti-site diffusion.
Publisher: Springer Science and Business Media LLC
Date: 27-07-2022
DOI: 10.1038/S41586-022-05130-0
Abstract: Single atoms or ions on surfaces affect processes from nucleation
Publisher: Springer Science and Business Media LLC
Date: 06-11-2020
DOI: 10.1038/S41467-020-19459-5
Abstract: The rise of two-dimensional (2D) crystalline superconductors has opened a new frontier of investigating unconventional quantum phenomena in low dimensions. However, despite the enormous advances achieved towards understanding the underlying physics, practical device applications like sensors and detectors using 2D superconductors are still lacking. Here, we demonstrate nonreciprocal antenna devices based on atomically thin NbSe 2 . Reversible nonreciprocal charge transport is unveiled in 2D NbSe 2 through multi-reversal antisymmetric second harmonic magnetoresistance isotherms. Based on this nonreciprocity, our NbSe 2 antenna devices exhibit a reversible nonreciprocal sensitivity to externally alternating current (AC) electromagnetic waves, which is attributed to the vortex flow in asymmetric pinning potentials driven by the AC driving force. More importantly, a successful control of the nonreciprocal sensitivity of the antenna devices has been achieved by applying electromagnetic waves with different frequencies and litudes. The device’s response increases with increasing electromagnetic wave litude and exhibits prominent broadband sensing from 5 to 900 MHz.
Publisher: American Chemical Society (ACS)
Date: 21-12-2020
Publisher: American Chemical Society (ACS)
Date: 09-01-2015
DOI: 10.1021/NL503460P
Abstract: We have used elastomeric st s with periodically varying adhesive properties to introduce structure and print folded graphene films. The structure of the induced folds is investigated with scanning probe techniques, high-resolution electron-microscopy, and tip-enhanced Raman spectroscopy. Furthermore, a finite element model is developed to show the fold formation process. Terahertz spectroscopy reveals induced anisotropy of carrier mobility along, and perpendicular to, the graphene folds. Graphene fold printing is a new technique which allows for significant modification of the properties of 2D materials without damaging or chemically modifying them.
Publisher: American Chemical Society (ACS)
Date: 10-08-2020
Publisher: Springer Science and Business Media LLC
Date: 14-11-2022
Publisher: Elsevier BV
Date: 02-2015
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8CC01789A
Abstract: We present the use of a polymeric stabilizer which stymies the degradation of black phosphorus nanosheets in aqueous media as well as imparting superhydrophobic properties to immobilised nanosheets.
Publisher: American Chemical Society (ACS)
Date: 19-07-2021
DOI: 10.1021/JACS.1C03036
Publisher: Oxford University Press (OUP)
Date: 04-2016
DOI: 10.1017/S1431927616000064
Abstract: A new method to perform X-ray absorption correction for spherical particles in quantitative energy-dispersive X-ray spectroscopy in the scanning transmission electron microscope is presented. An absorption correction factor is derived and simulated data is presented encompassing a range of X-ray absorption conditions. Theoretical calculations are compared with experimental data of X-ray counts from Au nanoparticles to verify the derived methodology. The effect of detector elevation angle is considered and a comparison with thin-film absorption correction is included.
Publisher: American Chemical Society (ACS)
Date: 26-04-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8SC04018D
Abstract: Thermolysis of molecular precursors followed by liquid phase exfoliation accesses 2-D IV–VI semiconductor nanomaterials.
Publisher: IOP Publishing
Date: 25-07-2005
Publisher: Springer Science and Business Media LLC
Date: 02-09-2019
DOI: 10.1038/S41565-019-0536-5
Abstract: Monolayers of graphene and hexagonal boron nitride (hBN) are highly permeable to thermal protons
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0RA09761F
Abstract: Synthesis of a new solid solution (Ta,Ti) 3 C 2 T x MXene from the new quaternary (Ta,Ti) 3 AlC 2 MAX phase system, with variable Ti : Ta ratios, has been demonstrated.
Publisher: Elsevier BV
Date: 05-2016
Publisher: American Chemical Society (ACS)
Date: 23-10-2018
Publisher: Springer Science and Business Media LLC
Date: 26-08-2021
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Sarah Haigh.