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1. Highly organized aragonite mesorods: A general 3-dimensional oriented attachment and its implication for biomineralization | |||
Zhou Gentao,Yao Qizhi,Ni Jie,Jin Gu | |||
Earth Science 15 July 2010 | |||
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Abstract:Highly organized aragonite mesorods were synthesized at low temperatures in a broad range of pH values and in absence of any bio- or organic- macromolecules. The organized mesorods were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scan electron microscope (FESEM), transmission electron microscope (TEM), and selected area electron diffraction (SAED), energy dispersive X-ray spectroscopy (EDX) techniques. FESEM results reveal that the aragonite mesorods are not only assembled with aragonite microrods by end-to-end, and side-to-side, but also partially fused one another, forming flat faceted surfaces. TEM and SAED analyses confirm that the organized mesorods have the same crystallographic symmetry as the single-crystalline aragonite, indicating that the self-assembly process is favorable energetically. Similar assembly process also occurs for mineral strontianite or witherite of aragonite group. The driving force for the self-assembly process may originate from the inherent anisotropic dipole-dipole interactions between the assembled units. As a result, a general 3D oriented attachment process may orchestrate the mesorods self-assembly into quasi-single crystalline microrods, and such mineralization mechanism can generally occur in biomineralization. It appears that the biological genetic and crystallochemical factors may work synergically in biomineralization. | |||
TO cite this article:Zhou Gentao,Yao Qizhi,Ni Jie, et al. Highly organized aragonite mesorods: A general 3-dimensional oriented attachment and its implication for biomineralization[OL].[15 July 2010] http://en.paper.edu.cn/en_releasepaper/content/4379009 |
2. A first-principles study of the structural properties of jadeite at high pressure | |||
Fan Xiaoyu ,Wu Xiuling ,Meng Dawei ,Liu Weiping ,Hong Hanlie ,Zheng Guang ,Zheng Jianping | |||
Earth Science 11 January 2010 | |||
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Abstract:The structural properties of jadeite are investigated using plane-wave pseudopotential density functional theory method. As a function of pressure, the monoclinic cell parameters were calculated and the compressibility coefficients are 0.0025, 0.0024 and 0.0025 GPa-1, respectively. The bond length, bond angle, and distortion variation were studied in order to obtain the information of polyhedral compression. The Birch-Murnaghan equation of state was considered in the theoretical calculations of E-V and P-V data for the bulk modulus B0, which were compared with the result based on the linear compressibilities. Comparison between the calculated B0 values and the experimental data suggested that the model provides reasonable insights into crystallographic and physical properties of jadeite. | |||
TO cite this article:Fan Xiaoyu ,Wu Xiuling ,Meng Dawei , et al. A first-principles study of the structural properties of jadeite at high pressure[OL].[11 January 2010] http://en.paper.edu.cn/en_releasepaper/content/38783 |
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