Browsing by Author "Huang, S"

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    “114”-Type nitrides LnAl(Si4−xAlx)N7Oδ with unusual [AlN6] octahedral coordination
    (Wiley, 2017-02-28) Huang, S; Huang, Z; Cao, P; Zujovic, Z; Price, JR; Avdeev, M; Que, M; Suzuki, F; Kido, T; Ouyang, X; Kaji, H; Fang, M; Liu, YG; Gao, W; Söhnel, T
    Aluminum–nitrogen six-fold octahedral coordination, [AlN6], is unusual and has only been seen in the high-pressure rocksalt-type aluminum nitride or some complex compounds. Herein we report novel nitrides LnAl(Si4−xAlx)N7Oδ (Ln=La, Sm), the first inorganic compounds with [AlN6] coordination prepared via non-high-pressure synthesis. Structure refinements of neutron powder diffraction and single-crystal X-ray diffraction data show that these compounds crystallize in the hexagonal Swedenborgite structure type with P63mc symmetry where Ln and Al atoms locate in anticuboctahedral and octahedral interstitials, respectively, between the triangular and Kagomé layers of [SiN4] tetrahedra. Solid-state NMR data of high-purity La-114 powders confirm the unusual [AlN6] coordination. These compounds are the first examples of the “33-114” sub-type in the “114” family. The additional site for over-stoichiometric oxygen in the structure of 114-type compounds was also identified. © 1999-2021 John Wiley & Sons, Inc.
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    Enigmatic human remains from the Pleistocene-Holocene transition of southwest China and the complex evolutionary history of east Asians
    (Australian Geosciences Council, 2012-08-05) Curnoe, D; Ji, X; Herries, AIR; Bai, K; Taçon, PSC; Bao, Z; Fink, D; Zhu, Y; Hellstrom, JC; Luo, Y; Cassis, G; Su, B; Wroe, S; Hong, S; Parr, WCH; Huang, S; Rogers, N
    The Upper Pleistocene hominin fossil record of East Asia is poorly known due to a scarcity of well-described, reliably classified and accurately dated fossils. In 2008, we started a joint project involving six Chinese and five Australian institutions to examine the later Pleistocene human record from southwest China. The region has been identified from genetic research as a hotspot of human diversity, and has yielded a number of human remains thought to derive from Pleistocene deposits. We prepared, reconstructed, described and dated a new partial skeleton from a consolidated sediment block collected in 1979 from the site of Longlin Cave (Guangxi Province). We also undertook new excavations at Maludong (Yunnan Province) to clarify the stratigraphy and dating of a large sample of mostly undescribed human remains from the site. Both samples probably derive from the same population, exhibiting an unusual mixture of modern human traits, characters probably plesiomorphic for later Homo, and some unusual features. We dated charcoal with AMS radiocarbon dating and speleothem with the Uranium-series technique and the results show both samples to be from the Pleistocene-Holocene transition: ∼14.3–11.5 ka. At nearby sites, some modern humans had already begun the economic transition to agriculture by this time. We suggest the Longlin-Maludong humans represent either a late-surviving archaic population or a previously unknown modern human group who colonised East Asia probably without leaving descendants. The archaeological record of Maludong indicates these humans were engaging in complex behaviours, including ochring bones and shells and manufacturing containers from human skulls.
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    Probing solid-liquid interfaces using radiotracer technology: characterization of functionalized microspheres.
    (American Chemical Society, 2008-08-26) Huang, S; Joso, R; Fuchs, A; Barner, L; Smith, SV
    This study explores the use of nuclear probes (radiolabeling techniques) for the quantification of available, reactive groups on solid surfaces and their role in the engineering of materials for biosensor applications. Microspheres were synthesized with reactive carboxylate groups as conjugation sites for proteins. The carboxylate groups were reacted with three bifunctional ligands, sarar, aminobenzyl-cyclen, and aminobenzyl-dota. The reaction conditions used were similar to that employed for the conjugation of proteins and optimized for the concentration of reactants (bifunctional ligand and EDC), pH, and time at 21°C. Of the three bifunctional ligands conjugated to the microsphere, sarar proved to be the most efficient. Optimum reaction conditions employed molar ratios of 1:20:100 for microspheres (estimated carboxylate groups of 1.1 × 10−7 per milligram of microspheres):sarar:EDC at pH 5.0 for 1 h, followed by 57/natCo radiolabeling at pH 7.0. The study demonstrates how nuclear probes with high specificity and sensitiviy can provide invaluable information on available reactive sites on solid surfaces at extremely low concentrations (>10−10 M) in a range of media. More importantly the nuclear probes enable the characterization of the surfaces of new materials in a non-destructive manner under conditions relevant to the engineering of the materials and ultimately the desired biosensor. © 2008, American Chemical Society
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    Using neutron diffraction to explore lithium displacement within cubic phase stabilised Ga-doped Li6.75La3Zr1.75Ta0.25O12 lithium garnet oxides
    (Elsevier, 2023-12-15) Christopher, TD; Zhang, T; Huang, S; Zujovic, Z; Avdeev, M; Cao, P; Söhnel, T
    Typical Li6.75La3Zr1.75Ta0.25O12 exists as a mixture of tetragonal and cubic arrangements, but adding small amounts of Ga3+ (Li6.75–3xGaxLa3Zr1.75Ta0.25O12 x ≥ 0.1) resulted in a single cubic (I a-3d) phase lithium garnet oxide. Following the stabilisation of the cubic phase, the effects on lithium distributions were explored with neutron powder diffraction concerning Ga3+ content and temperature. Increasing the amount of Ga3+ reduced the amount of lithium within the structure, directly decreasing the Li 96h site occupancy and showing a minimal effect on the Li 24d site occupancy. High-temperature neutron diffraction studies revealed the migration of lithium from the Li 24d site to the Li 96h with increasing temperature. The inclusion of Ga3+ improved the total ionic conductivity over the gallium-free system. However, with increasing gallium content (x > 0.1), a negative correlation between the garnet's gallium content and total lithium ionic conductivity is observed, showing how the total amount of free lithium ions impact the system's total ionic conductivity. Though the electrolytes explored here show some limitations, the lithium-ion displacement trends with doping and temperature give us further insight into how these lithium garnet systems respond to chemical and physical change. © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY licence.