Flower-like superstructure of boron carbon nitride nanosheets with adjustable band gaps for photocatalytic hydrogen peroxide production
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We describe methodology for producing highly uniform, ordered and reproducible superstructures of surfactant-coated ZnS nanorod and nanowire assemblies, and propose a predictive multiscale "packing model" for superstructure formation based on electron microscopy and powder X-ray diffraction data on the superstructure, as well as on individual components of the nanostructured system. The studied nanoparticles showed a hierarchical structure starting from the individual faceted ZnS inorganic cores, onto which the crystalline surfactant molecules are adsorbed, to the superstructure of the nanoparticle arrays. Our results point out the critical role of the surfactant headgroup and polarity in nanoparticle assembly, and demonstrate the relationship between the molecular structure of the surfactant and the resulting superstructure of the nanoparticle assemblies.
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How to contribute to the hull girder strength for the superstructure,namely,the superstructure effectiveness is often considered on the design of ship structure.Correct calculation of superstructure effectiveness can not only help the structure design of superstructure,but also avoid the appearance of cracks and extend the service life of ships.On modern project design,various approximate methods are used to estimate the superstructure effectiveness.The precision and applicability of these methods should be validated with experiments.The guidance to the project design is to come true.
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The seismic response of the structure isolated by friction pendulum system(FPS)with an asymmetric superstructure under bilateral ground motions is analyzed.The effects of the eccentricity and the torsional stiffness on the superstructure are studied.It is shown that the effect of the eccentricity of the superstructure on the displacement and the acceleration of the superstructure and the isolation layer is remarkable.Even though the eccentricity is small,the effect of which should be taken into account in the seismic design of the base-isolated structure.The effect of the torsional stiffness of the superstructure on the seismic response of the superstructure is more remarkable than that on the seismic response of the isolation layer.So the seismic response of the superstructure can be effectively diminished by decreasing the eccentricity and increasing the torsional stiffness of the superstructure.
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La3+and V5+co-doped Bi Fe O3 ceramics are synthesized by rapid liquid sintering technique. The modulated structure in Bi0.85La0.15Fe0.97V0.03O3 is investigated by using transmission electron microscopy(TEM). Two kinds of superstructures are observed in the samples. One is the component modulated superstructure and twin-domain, which is generated by La3+ordered substitution for Bi3+and frequently appears. The chemical composition of the superstructure is explored by x-ray energy dispersive spectroscopy(EDS). The model of the ordered structure is proposed. Simulation based on the model is conducted. The second is the fluorite-type δ-Bi2O3 related superstructure. The relation between the ferroelectric property and the microstructure of the sample is also discussed.
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Ferroelectric ceramics
Energy-dispersive X-ray spectroscopy
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Superstructures are often observed in inorganic crystals, including many minerals and certain important solid state materials. In diffraction patterns of such crystals, superstructure reflections, which carry information of the structure details, are generally very weak. The common practice in structure determination is, therefore, to ignore the superstructure reflections at first, making use only of the strong pseudos-tructure reflections to find a pseudostructure to account for the essential structural features. The precise superstructure is then derived on its basis. However, this approach is complicated in consequence of the impossibility to derive the latter directly from the former by means of ordinary techniques of structure refinement. To overcome this difficulty, it is proposed in this paper that the phases of superstructure reflections can be derived directly from those of the pseudostructure reflections. This considerably simplifies the procedure of superstructure determination. Applications to practical structures confirmed the effectiveness of the method.
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Journal Article Superstructure in SmCo7 phase Get access Hong-Chun Yu, Hong-Chun Yu *To whom correspondence should be addressed. E-mail: hcyu@blem.ac.cn Search for other works by this author on: Oxford Academic PubMed Google Scholar Jian-Qi Li, Jian-Qi Li Search for other works by this author on: Oxford Academic PubMed Google Scholar Yuan-Qian Bei, Yuan-Qian Bei Search for other works by this author on: Oxford Academic PubMed Google Scholar Yu-Qing Zhou, Yu-Qing Zhou Search for other works by this author on: Oxford Academic PubMed Google Scholar Jian Zhang, Jian Zhang Search for other works by this author on: Oxford Academic PubMed Google Scholar Wen-Yong Zhang, Wen-Yong Zhang Search for other works by this author on: Oxford Academic PubMed Google Scholar Bao-Geng Shen Bao-Geng Shen Search for other works by this author on: Oxford Academic PubMed Google Scholar Journal of Electron Microscopy, Volume 53, Issue 1, March 2004, Pages 37–42, https://doi.org/10.1093/jmicro/53.1.37 Published: 01 March 2004 Article history Received: 11 June 2003 Accepted: 27 October 2003 Published: 01 March 2004
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Self-assembled MnN nanoislands have been prepared on Cu(001) substrate. The nanoislands show a square shape and a well-defined size. They are regularly arrayed with a periodicity of (3.5+/-0.1) nanometer and form a two-dimensional square superstructure. The MnN island superstructure is stabilized by a short-range mechanism. A structural model has been proposed to explain the self-assembly and the high quality of the superstructure.
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