64 research outputs found
Heterometallic lanthanide-centred [NiII6LnIII] rings
A [NiII6DyIII] heptanuclear complex featuring a rare six-membered {NiII6} metal ring surrounding the central Dy(III) ion is reported. Magnetic studies reveal single-molecule magnet behaviour for the complex under zero external dc field, while replacing the DyIII ion with ΄III or GdIII ions allows for a comprehensive understanding of the magnetic behaviour
From Chalcogen Bonding to SâÏ Interactions in Hybrid Perovskite Photovoltaics
The stability of hybrid organicâinorganic halide perovskite semiconductors remains a significant obstacle to their application in photovoltaics. To this end, the use of lowâdimensional (LD) perovskites, which incorporate hydrophobic organic moieties, provides an effective strategy to improve their stability, yet often at the expense of their performance. To address this limitation, supramolecular engineering of noncovalent interactions between organic and inorganic components has shown potential by relying on hydrogen bonding and conventional van der Waals interactions. Here, the capacity to access novel LD perovskite structures that uniquely assemble through unorthodox Sâmediated interactions is explored by incorporating benzothiadiazoleâbased moieties. The formation of Sâmediated LD structures is demonstrated, including oneâdimensional (1D) and layered twoâdimensional (2D) perovskite phases assembled via chalcogen bonding and SâÏ interactions, through a combination of techniques, such as single crystal and thin film Xâray diffraction, as well as solidâstate NMR spectroscopy, complemented by molecular dynamics simulations, density functional theory calculations, and optoelectronic characterization, revealing superior conductivities of Sâmediated LD perovskites. The resulting materials are applied in nâiâp and pâiân perovskite solar cells, demonstrating enhancements in performance and operational stability that reveal a versatile supramolecular strategy in photovoltaics
From Chalcogen Bonding to SâÏ Interactions in Hybrid Perovskite Photovoltaics
The stability of hybrid organicâinorganic halide perovskite semiconductors remains a significant obstacle to their application in photovoltaics. To this end, the use of lowâdimensional (LD) perovskites, which incorporate hydrophobic organic moieties, provides an effective strategy to improve their stability, yet often at the expense of their performance. To address this limitation, supramolecular engineering of noncovalent interactions between organic and inorganic components has shown potential by relying on hydrogen bonding and conventional van der Waals interactions. Here, the capacity to access novel LD perovskite structures that uniquely assemble through unorthodox Sâmediated interactions is explored by incorporating benzothiadiazoleâbased moieties. The formation of Sâmediated LD structures is demonstrated, including oneâdimensional (1D) and layered twoâdimensional (2D) perovskite phases assembled via chalcogen bonding and SâÏ interactions, through a combination of techniques, such as single crystal and thin film Xâray diffraction, as well as solidâstate NMR spectroscopy, complemented by molecular dynamics simulations, density functional theory calculations, and optoelectronic characterization, revealing superior conductivities of Sâmediated LD perovskites. The resulting materials are applied in nâiâp and pâiân perovskite solar cells, demonstrating enhancements in performance and operational stability that reveal a versatile supramolecular strategy in photovoltaics
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Argonne National Laboratory Reports
Report of the Argonne National Laboratory Chemical Engineering Division on fuel-cycle studies including pyro-chemical separation of plutonium and americium oxides from contaminated materials of construction such as steel, advanced solvent extraction techniques in the development of centrifugal contactors for use in Purex processes, and a review and evaluation of the encapsulation of high-level waste in a metal matrix
Soil microbial activity as influenced by compaction and straw mulching
Field study was performed on Haplic Luvisol soil
to determine the effects of soil compaction and straw mulching on microbial parameters of soil under soybean. Treatments with different compaction were established on unmulched and mulched with straw soil. The effect of soil compaction and straw mulching
on the total bacteria number and activities of dehydrogenases, protease, alkaline and acid phosphatases was studied. The results
of study indicated the decrease of enzymes activities in strongly compacted soil and their increase in medium compacted soil as compared to no-compacted treatment. Mulch application caused stimulation of the bacteria total number and enzymatic activity in the soil under all compaction levels. Compaction and mulch effects were significant for all analyzed microbial parameters (P<0.001)
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