High resolution transmission electron microscopic study of synthetic nanocrystalline mackinawite
High resolution transmission electron microscopic study of synthetic nanocrystalline mackinawite
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DOI：
10.1016/j.epsl.2005.10.006
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发表时间：
2006-01-15
影响因子：
5.3
通讯作者：
Rickard, D
中科院分区：
文献类型：
--
作者：
Ohfuji, H;Rickard, D
使用高分辨率透射电子显微镜的直接观察表明，沉淀的一硫化二铁，FeS，由纳米晶mackinawite颗粒。单个纳米晶体是层状直线棱柱，显示厚度为2至5.7 nm（平行于c轴的方向）和长度为3至10.8 nm的连续粒度。相应的平均比表面积估计为380 +/- 10 m2/g。用电子衍射法测得从沉淀FeS和冻干FeS中得到的mackinawite纳米晶的d（001）分别为5.19和5.08埃。水对纳米颗粒结构的影响由在无水环境中形成弯曲结构和罕见的位错来表示。晶格间距的缺乏或较弱所暗示的明显无序是这些颗粒尺寸下布拉格系统学崩溃的症状。结果证实，纳米颗粒材料不表现为简单的小片段，其散装结晶对应物。这些结果有助于了解行星表面和生物圈中纳米颗粒材料的行为，特别是FeS在缺氧水环境中的性质和特性。(c)2005 Elsevier B. V.保留所有权利。
Direct observation using high resolution transmission electron microscopy reveals that precipitated iron(II) monosulfide, FeS, consists of nanocrystalline mackinawite particles. The individual nanocrystals are laminar rectilinear prisms displaying a continuum of particle sizes from 2 to 5.7 nm in thickness (the direction parallel to the c axis) and from 3 to 10.8 nm in length. The corresponding mean specific surface area is estimated to be to 380 +/- 10 m(2)/g. The d(001) of mackinawite nanocrystals obtained from precipitated FeS and freeze-dried FeS by electron diffraction are 5.19 and 5.08 angstrom, respectively. The effect of water on the nanoparticle structures is indicated by the formation of curved structures and infrequent dislocations in an anhydrous environment. The apparent disorder suggested by absent or weaker lattice spacings is symptomatic of the breakdown of Braggian systematics at these particle sizes. The results confirm that nanoparticulate materials do not behave simply as small fragments of their bulk crystalline counterparts. The results contribute to understanding the behavior of nanoparticulate materials on planetary surfaces and in the biosphere in general and the nature and properties of FeS in anoxic aqueous environments in particular. (c) 2005 Elsevier B.V. All rights reserved.