5,796 Works

Quasi-Elastic Neutron Scattering on adenine-based gold(I) hydrogel-entangled water molecules

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The hydrogelation of gold(I) complexes is a fascinating albeit still underdeveloped area of soft matter chemistry, with feasible high-technology applications based on the unique properties of this metal. Although the scarce number of reported examples so far has been thoroughly studied by a wide plethora of techniques, there is a general lack of information on how water molecules assist the formation of the supramolecular hydrogelating motifs (which are commonly fibers). Herein, we propose the in-depth...

MuSR investigations of TNO and LLZO diffusion mechanics above room temperature

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Li-ion technologies are at the forefront of energy storage applications, including automotive and stationary storage, to meet global demand. TiNb2O7 (TNO) has recently garnered industrial interest from providers of Li-ion battery technologies as a new Li-ion anode material, and Nb-LLZO as a solid-state electrolyte. A continuing challenge in Li-ion battery materials is to fully understand fundamental mechanics that underpin performance. The primary mechanism in Li-ion insertion electrodes is Li+ diffusion, which enables the electrochemical lithiation...

The membrane lipid composition regulates the orientation of Tissue Factor extramembrane domain

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Tissue Factor (TF) is a membrane protein located on the cell surfaces of extravascular cells. TF activity is fundamental for normal homeostasis- the physiological process which leads to blood coagulation. Indirect evidences suggest that the membrane lipid composition and in particular the presence of anionic phospholipid, such as phosphatidylserine (PS), and cholesterol has an important impact in stabilizing the protein complex and thus in regulating TF activity towards blood coagulation. No experimental data has so...

Investigating the antiferromagnetic order in (001)pc SmNiO3/NdNiO3 superlattices

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Rare earth nickelates (RNO3, but La) display a metal to insulator transition (MIT) as the temperature is reduced together with an unusual antiferromagnetic (AFM) order described by the (1/4,1/4,1/4)pc-wavevector below the Néel transition (TNéel). By growing superlattices (SLs) that combine SmNiO3 (SNO) and NdNiO3 (NNO) layers two nickelates displaying different critical temperatures, we have found that TMI of the whole system is controlled by the thickness of the individual SNO and NNO layers. In...

Spin excitations in the candidate Weyl semimetal EuCuAs

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Very recently, EuCuAs was proposed as an example of a topological semimetal. Our measurements on Wish show that the Eu magnetic structure is incommensurate with a propagation vector q = (0, 0, 4.1). This was unexpected, as ab inito calculations had predicted a collinear antferromagnetic order. It is a very interesting discovery because it means that the conduction states experience a time-reversal-symmetry-breaking interaction, which could create a pair of Weyl points in the electronic band...

OH- and water dynamics in Anionic Exchange Membranes (AEMs)

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Over the past few decades, fuel cell research has grown exponentially with the continued development of new materials and systems for automotive and stationary applications. Most interest has focused on polymer electrolyte (both cation -CEM- and anion -AEM- exchange membranes) membrane fuel cells because of their power densities, lower cost and wider applications. Albeit intensive efforts have been made to develop and improve AEMs membranes, they still display poor ionic conductivity. This is also because,...

OH- and water dynamics in Anionic Exchange Membranes (AEMs)

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Over the past few decades, fuel cell research has grown exponentially with the continued development of new materials and systems for automotive and stationary applications. Most interest has focused on polymer electrolyte (both cation -CEM- and anion -AEM- exchange membranes) membrane fuel cells because of their power densities, lower cost and wider applications. Albeit intensive efforts have been made to develop and improve AEMs membranes, they still display poor ionic conductivity. This is also because,...

INS Study of Molybdenum Clay Hydrodeoxygenation Catalyst: Effect of Promoter - MAPS

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The Indonesian government has pledged to ensure that all gas stations in Indonesia switch from diesel fuel to a biofuel blend produced from palm oil by 2025, as part of its drive to reduce the reliance on fossil fuels. Bio-oil is a promising non-food source of biofuel but further upgrading processes is necessary to reach a fuel grade quality. We have attempted to upgrade bio-oil via a hydrodeoxygenation process using our bentonite based catalyst, NiMo/PILC,...

Structural characterisation of an electron-transfer protein, cytochrome c, on modified gold and indium tin oxide surfaces

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This proposal concerns the adsorption behaviour of an electron-transfer protein, cytochrome c, on modified electrode surfaces. Cytochrome c plays an important role in transferring electrons across membranes, for example during photosynthesis. Bioelectrochemical devices that use light-harvesting biofilms to generate electricity are limited by slow electron transfer at the electrode surface, and so understanding how proteins such as cytochrome c interface with these electrodes is crucial for improving this technology. We previously successfully used an electrochemical...

Pressure driven phase transitions in the magnetically frustrated layered material, Ca2Mn3O8

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Frustration occurs in materials where antiferromagnetic (spin up and spin down pairs) are incomparible with the underlying crystal morphology, for example where the connectivity between magnetic ions has a triangular motif. In these magnetic materials the magnetically ordered state is often unconventional. Calcium manganese oxide, Ca2Mn3O8, exhibits managnese oxide layers seperated by calcium ions. Within the layers a complex "bow-tie" like connectivity of the maganese leads to a "two up two down" spin arrangement below...

Structure of hydrothermally grown croesite

The effect of manufacturing conditions on residual stress in polycrystalline diamond cutters

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Polycrystalline diamond cutters are ultra-hard tools used for oil and gas drilling. They are produced by sintering diamond particles at High Pressure (5.5+ GPa) and High Temperature (1300+ K). After synthesis, the cutter is returned to room temperature and pressure. The significant mismatches in thermal expansion coefficient and stiffness between the diamond table and the tungsten carbide substrate result in residual stresses. The magnitude and distribution of these residual stresses is believed to impact cutter...

Thermal expansion and magnetostriction in fayalite, Fe2SiO4

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Olivines - in particular the solid-solution between forsterite (Mg2SiO4) and fayalite (Fe2SiO4) - are important rock-forming minerals on Earth, also occurring in meteorites and interstellar dust. Olivines form the major component of Earth's upper mantle and the point at which their structure becomes unstable with respect to denser minerals marks the upper boundary of the transition zone between the upper and lower mantle. The thermal expansion of fayalite (Fe2SiO4) is unusual and not well understood...

Determination of the accurate crystal structure of Na2ZrO3 and its conversion to Na2CO3 upon CO2 uptake

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The aim of the proposal is to study the crystal structure of Na2ZrO3, which is one of the key solid-state materials for CO2 capture. Laboratory experiments have established a correlation between improved CO2 uptake and heating rates during synthesis. The experiment will enable characterisation of the structural differences between these samples, likely to be differing Na+ content, using neutron powder diffraction. This will involve room temperature data collected on a range of synthesised samples but...

Structural Investigations of Nickel-Substituted Bornite

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We wish to collect powder neutron diffraction data on modified bornites, Cu5Fe1-xNixS4 (0

In-situ measurement of 3D stress distribution in Inconel 625 alloy during compression

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This application is prepared according to the suggestion made by the panel for our RB1820187 application. In this application we request a day of Express time and will carry out a feasibility study for future work on in-situ hot compression experiments.Nickel based wrought Inconel 625 alloys are widely used for many applications due to their good mechanical properties, weldability and resistance to corrosion in aggressive environments. Hot extrusion technology is commonly used to manufacture Inconel...

Characterisation of Hybrid Lipid-Polymer Nanoparticles

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Hybrid lipid-polymer nanoparticles have demonstrated potential as drug delivery vehicles. The current proposal aims to use small angle neutron scattering (SANS) in combination with contrast variation to determine the detailed molecular structure of the drug-containing hybrid lipid-polymer nanoparticles, as well as their component lipid vesicles and polymeric nanoparticles. SANS coupled with contrast variation will allow us to establish precisely how much lipid is required to reproducibly and reliably coat the various sized polymeric NPs without...

Solubilisation of membrane protein REAMP in polymer-stabilised nanodiscs

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Poly(Styrene-Maleic Acid) (SMA) is increasingly used in the formation of lipid-nanodiscs for structural membrane studies and biophysics. These polymer-formed nanodiscs are an appealing choice compared to more traditional alternatives, as preparations are stable, quick, low cost and can be produced in large quantities. In this proposal we wish to study the membrane proteins gramicidin and REAMP within polymer-nanodiscs using SMA variants. REAMP is a de novo membrane protein containing four alpha-helical transmembrane domains while gramicidin...

To measure the length scale of magnetic domains across the metal to insulator transition in a Pr, Ca co-doped LaMnO3 thin film using GISANS

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Pr, Ca co-doped LaMnO3(LPCMO) exhibits a variety of complex physical properties owing to the co-existence and competition of different structural, magnetic and electronic degrees of freedom. The complex interplay of lattice, orbital, spin and charge interactions in LPCMO gives rise to a very rich phase diagram with properties such as a metal to insulator transition (MIT), colossal magneto-resistance and phase separation. In bulk hole-doped manganites, multiple electronic phases coexist as a consequence of non-uniform distributions...

Probing the dimensional crossover of critical fluctuations in ferromagnetic quantum critical system UCoSi2

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In recent times, study of quantum critical point(QCP) and quantum phase transition(QPT) has become one of the most appealing research topics. Notably, near the critical point one observes unconventional power-law type divergence of different physical properties such as electrical resistivity or heat capacity. Such unusual behavior solely depend on the dimensionality of the critical spin fluctuations. We have recently investigated UCoSi2 which is proposed to be situated very close to ferromagnetic (FM) quantum critical point....

Evolution of serpentinite oceanic textures across Alpine metamorphism: neutron radiography and computed tomography

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Serpentinisation of oceanic mantle is one of the most important mineralogical reactions in the Earth Science. This reaction involves the interaction between the upper mantle mineral with seawater at temperatures ranging from 100 to 350oC and produces a magnesium-rich hydrous silicate, serpentine ((Mg,Fe)3Si2O5(OH)4). Once subducted the seperntinised oceanic lithosphere is believed to play a major role in supplying water to the overlying mantle wedge and may trigger intermediate earthquakes. Recovered serpentinised rocks are useful in...

Entropy change of protein and water during the denaturation of cytochrome P450s

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Cytochrome P450s are ubiquitous hemeprotein monooxygenases that catalyse numerous biochemical reactions, and the investigation on them is of significance to both the protein engineering and human health. We found that the thermophilic cytochrome P450, CYP119, may achieve both greater thermal stability and higher structural flexibility simultaneously by keeping larger entropy at the native state. Although we have measured the thermodynamic curves during the denaturation of both CYP101A1 and CYP119, its quite difficult to distinguish the...

Mechanistic Investigation of Host-Guest Molecular Interactions of Drug Nanoconfined within the Pores of Metal Organic Frameworks

We propose to employ the TOSCA spectrometer to preform inelastic neutron scattering of novel biocomposite systems, designated as drug@MOF. The aim is to measure the detailed vibrational spectra of a porous hybrid framework (host) such as ZIF-8, encapsulating a guest molecule, such as aspirin, caffeine, and 5-FU anticancer drugs. The proposed experiments will enable us to study the effects of host crystal morphology and pore configurations have on the confinement of drug molecules of different...

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  • 2019
    5,796

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