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Homogeneous and Interfacial Catalysis in 3D Controlled Environments
γ-irradiation induced the formation of stable radicals that were used to polarize 29Si and 1H spins in inorganic and organic solids by dynamic nuclear polarization (DNP). γ-irradiation will enable magic angle spinning (MAS) DNP experiments on previously inaccessible non-porous inorganic solids and insoluble polymers.
Georgiy Akopov, a postdoctoral research associate at the U.S. Department of Energy’s Ames Laboratory, has won a Young Investigator Award from the American Chemical Society Division of Inorganic Chemistry.
Topology-protected charge transport on surfaces of three-dimensional topological insulators (TIs) is breaking new ground in quantum science and technology.
We have developed and validated a model which predicts size-independent shapes of metal nanoparticles that are supported on a solid surface and blanketed by a two-dimensional material such as graphene.
Lattice instability criterion is linear in stresses for any stress state in a material.
Understanding the link between magnetism and unconventional superconductivity remains a grand challenge in quantum materials. Significant progress gaining deeper insight into this challenge has been made via the first observation of a quantum criticality (QC) with a hedgehog spin-vortex crystal antiferromagnetic state.
Accelerating the discovery of improved polarizing agents through simulation requires a proper treatment of the concerted dynamics of thousands of spins over several seconds, far exceeding conventional approaches incorporating only a handful of spins. This was achieved by restricted state space methods and a Monte Carlo optimization algorithm to calculate the enhancements directly, without worrying about the timescale of the interactions. This new approach enabled the calculation of DNP enhancements in systems containing upwards of 50 spins allowing for the importance of the spin diffusion and the diffusion barrier to be determined.
Organolead halide and mixed halide perovskites (CH3NH3PbX3, CH3NH3PbX3–nYn, X and Y = Cl–, Br–or I–), are promising materials for photovoltaics and optoelectronic devices but phase segregation halide ion speciation in mixed halide perovskites remain a challenge. Here we show that both fast MAS and DNP-enhanced solid-state NMR spectroscopy can increase sensitivity while reducing data acquisition time.
Introducing disorder through electron irradiation simultaneously suppresses the magnetic and superconducting transition temperatures. The effects of non-magnetic disorder reveals the non-trivial influence of non-magnetic disorder on coupled superconductivity and magnetism in iron based superconductors.