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Tungstates of 3d-transition metals form an important family of inorganic materials with applications in various fields. CuWO4 is one of them, being well known as a semiconductor with technological applications in scintillator detectors, laser hosts, photoanodes, optical fibers, etc. In the last few years it has also attracted attention as a multiferroic material with an intriguing magnetic phase diagram. CuWO4 has been studied at ambient pressure to characterize its optical, magnetic, and ...
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Iron is necessary for many cellular reactions and is therefore an essential nutrient for all living organisms. However, insolubility and toxicity of iron make its acquisition and processing a great challenge for living organisms. Thus to overcome such difficulties, bacteria have developed iron homeostasis mechanisms that involve control of three key processes: iron uptake, iron utilisation and storage of excess iron. Among these processes, uptake of iron plays a particularly crucial role for ...
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Growing concerns about fuel security and global warming have made the development and use of sustainable (low carbon) sources of energy an increasingly attractive proposition. Harvesting energy from sunlight at low-cost using photovoltaic devices is a rapidly growing research area, with organic based photovoltaics (OPVs) attracting particular interest as they have the potential advantages of low manufacturing-cost (as they are fabricated using solution based techniques) and ...
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Spherulites are roughly spherical structures, and their name derives from the Greek for ‘ball’ and ‘stone’. Spherulites occur in various forms in nature. Those that form from polymers self-assemble into arrays of fibres that radiate out from the centre of the structure, and they are typically observed with diameters on the micrometre-scale. The arrangement of the fibres in the spherulite gives rise to birefringence, which may be observed when the spherulite is placed between crossed ...
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Templates are widely used to arrange molecular components so that they can be covalently linked to generate complex molecules that are not readily accessible by classical synthetic methods. Nature uses sophisticated templates such as the ribosome, whereas chemists use simple ions or small molecules. But as we tackle the synthesis of larger targets, we require larger templates — which themselves become synthetically challenging. Recently, we have shown that Vernier complexes can solve this ...
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Inorganic-organic frameworks, particularly metal-organic frameworks (MOFs), have attracted considerable attention over the last decade because they exhibit a wide range of interesting physical properties.1 These include the ability to store or separate gases and perform catalytic reactions in nanoporous MOFs; while fascinating magnetic and electronic properties are found in denser frameworks. The transition metal gallate frameworks, M(C7HxO5)·2H2O (M = metal and x = 3 or 4) have ...
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A range of techniques have been used to show that the behaviour of the superconductivity in LiFeAs is quite different from that in the other iron arsenide superconductors, and the system shows some similarities with the FeSe system.
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Crystalline porous solids, such as aluminosilicate zeolites have achieved widespread use in commercial processes of adsorption and catalysis. However, they are limited for many fine chemical conversions of complex organic molecules by the size of their pores, which typically do not exceed 1 nm. Mesoporous silicas are known with pore sizes of 3 nm upwards, but these lack long range order, so that crystallography cannot be used to measure, understand and improve their catalytic performance. ...
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The alteration shown by silver leaf applied to polychrome carved wood and altarpieces to imitate metal objects (arms, garments, tools and decorative mouldings) is a very generalised phenomenon. The processes involved are not well understood, limiting the development of adequate conservation strategies. The object of the study was to determine and clarify the alteration mechanisms. For this, several silver foils from polychrome carved wood, mouldings as well as flat surfaces of altarpieces ...
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Combinatorial high-throughput screening at Diamond may prove useful in discovering novel bulk hydrogen storage materials, according to new research published this month in the Royal Society of Chemistry’s Faraday Discussions journal.
A team of researchers from the ‘HyStorM’ project, a collaboration between Oxford University, Johnson Matthey, Ilika Technologies and the ISIS facility, funded by the Technology Strategy Board, used innovative high-resolution Powder X-Ray Diffraction (XRD) ...
