Small rhombihexahedra and small cubicuboctahedra, namely faceted polyhedra, form the basis of two novel low-density framework solids that are afforded by the self-assembly of molecular squares only or molecular squares and triangles, respectively.
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Considering factors such as crustal reserves, atomic mass, redox potential and energy density, sodium-ion batteries (SIBs) are regarded as the most promising alternative to lithium-ion batteries (LIBs). Transition metal-based layered oxides, especially typical NaMnO, stand out among cathode materials due to their low cost and high energy density. However, NaMnO cathodes face several challenges, including Jahn-Teller distortion, manganese dissolution, structural collapse, irreversible phase transition and significant capacity loss.
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Two convex polyhedra that markedly resemble the head of the flatback sea turtle hatchling are identified. The first example is a zygomorphic tetragonal dodecahedron, while the other, an even better matching structure, is a related tetradecahedron, herein speculated to arise from this particular dodecahedron via known mechanisms gleaned from studies of the behavior of foams. A segmented, biomorphic, convex polyhedral model to address cephalic topology is thus presented stemming from solid geometry, anatomical observations, and a recently computed densest local packing arrangement of fifteen slightly oblate spheroids in which fourteen oblate spheroids surround a central such spheroid.
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Department of Chemistry, National Tsing Hua University, Hsinchu, 300044, Taiwan.
Article Synopsis
- By varying the amount of AgNO solution used, researchers synthesized different sizes of AgO crystals, including cubes, octahedra, and rhombic dodecahedra, with sizes ranging from 440 nm to 79 nm.
- X-ray diffraction (XRD) techniques revealed shape-related peak shifts and the presence of bulk and surface layer lattices, indicating changes in crystal structures at different temperatures, including negative thermal expansion behavior.
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