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- ItemMagnetic properties of the distorted kagomé lattice Mn3(1,2,4-(O2C)3C6H3)2(American Chemical Society, 2017-07-17) Mole, RA; Greene, S; Henry, PF; Humphrey, SM; Rule, KC; Unruh, T; Weldon, GF; Yu, DH; Stride, JA; Wood, PTKagomé lattice types have been of intense interest as idealized examples of extended frustrated spin systems. Here we demonstrate how the use of neutron diffraction and inelastic neutron scattering coupled with spin wave theory calculations can be used to elucidate the complex magnetic interactions of extended spin networks. We show that the magnetic properties of the coordination polymer Mn3(1,2,4-(O2C)3C6H3)2, a highly distorted kagomé lattice, have been erroneously characterized as a canted antiferromagnet in previous works. Our results demonstrate that, although the magnetic structure is ferrimagnetic, with a net magnetic moment, frustration persists in the system. We conclude by showing that the conventions of the Goodenough-Kanamori rules, which are often applied to similar magnetic exchange interactions, are not relevant in this case. © 2017 American Chemical Society.
- ItemWeight and mass for young physicists(Australian Insitute of Physics, 2021-10) Hall, CJ; Teniswood, CA reader response to the previous Young Physicists’ article about buoyancy raised an interesting question regarding the difference between weight and mass. Would the Ever Given sit higher or lower in the water of the canal if it was nearer the south pole? © 2021 Australian Institute of Physics Inc.
- ItemProton dynamics in phosphotungstic acid impregnated mesoporous silica proton exchange membrane materials(Elsevier, 2017-07) Lamb, K; Mole, RA; Yu, DH; De Marco, R; Bartlett, JR; Windsor, S; Jiand, SP; Zhang, J; Peterson, VKPhosphotungstic acid is an excellent proton conductor that can be incorporated into porous supports, and nanocomposite proton exchange membrane materials made from mesoporous silica impregnated with phosphotungstic acid have been suggested for use in fuels cells operating > 100 °C. In this work, quasielastic neutron scattering was used to study proton self-diffusion in mesoporous disordered and P6mm symmetry silica impregnated with two concentrations of phosphotungstic acid. Overall, the silica structure had a significantly greater effect on proton conduction and diffusion than phosphotungstic acid concentration, with higher proton conduction occurring for the P6mm symmetry silica samples. Quasielastic neutron scattering revealed two populations of protons diffusing through each sample, and that proton conduction is limited by the slower of these populations, which diffuse via a jump-diffusion mechanism. Whilst the fundamental jump-diffusion mechanism by which these slower protons moved was found to be similar for both silica supports and phosphotungstic acid concentrations, the faster diffusion occurring in P6mm structured silica arises from a lower residence time of protons moving between sites in the jump-diffusion model, suggesting a lower energy barrier. © 2017 Institute of Process Engineering, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BY-NC-ND license.
- ItemImpurity tolerance of unsaturated Ni-N‑C active sites for practical electrochemical CO2 reduction(American Chemical Society (ACS), 2022-02-09) Leverett, J; Yuwono, JA; Kumar, P; Tran-Phu, T; Qu, JT; Cairney, JM; Wang, X; Simonov, AN; Hocking, RK; Johannessen, B; Dai, L; Daiyan, R; Amal, RDemonstrating the potential of the electrochemical carbon dioxide reduction reaction (CO2RR) in industrially relevant conditions is a promising route for achieving net-zero emissions through decarbonization. This requires a catalyst system that displays not only high activity and stability but also the capacity to deliver a consistent performance in the presence of waste stream impurities. To explore these opportunities, we investigate the role that the Ni coordination structure plays on the impurity tolerance of highly active single-atom catalysts (SACs) during CO2RR. The as-synthesized materials are highly active for CO2RR to CO, achieving a current density of 470 mA cm-2 and a CO selectivity of 99% in a CO2 electrolyzer. We demonstrate, through high-temperature pyrolysis, that a higher concentration of “unsaturated” Ni-N4-x-Cx sites significantly improves the tolerance to NOx, SOx, volatile organic compounds, and SCN- impurities in aqueous electrolyte, paving the way for SACs capable of CO2RR in industrial conditions. © 2022 American Chemical Society.
- Item6th Design and Engineering of Neutron Instruments Meeting Organized by ANSTO in Sydney (Australia) 28 November – 1 December 2017(SAGE Publications, 2018-10) Anderson, DC; Désert, S; Hadad, N; Sutton, I; Olsen, SR; Eltobaji, A; Darmann, FA; Pullen, SA; Rule, KCThe Design and Engineering of Neutron Instruments Meeting series began at the Rutherford Appleton Labs, Oxford (UK) in 2012. This annual series brings together a wide range of technical staff, principally engineers, responsible for designing and operating neutron scattering facilities. Since then, this yearly event has been held in ORNL (Oak-Ridge TN, USA) in 2013, FRM II (Munich, Germany) in 2014, BNC (Budapest, Hungary) in 2015, ESS (Lund, Sweden) in 2016 and recently was held at ANSTO, Sydney (Australia).