首页> 外文期刊>Langmuir: The ACS Journal of Surfaces and Colloids >STRUCTURE AND MECHANISMS OF FORMATION OF FEOOH(NO3) OLIGOMERS IN THE EARLY STAGES OF HYDROLYSIS
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STRUCTURE AND MECHANISMS OF FORMATION OF FEOOH(NO3) OLIGOMERS IN THE EARLY STAGES OF HYDROLYSIS

机译:水解初期FEOOH(NO3)低聚物的结构和形成机理

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The partial hydrolysis of ferric nitrate solutions (0.1 M) and the structural evolution of the smallest oligomers were studied by using X-ray absorption spectroscopy at aging times between 1 h and 20 days at room temperature. The samples evolve differently with time, depending on the hydrolysis ratio. At the same aging time t, the number of iron atoms in the atomic environment of the central atom increases with hydrolysis ratio, but the growth does not follow a defined pathway. Only N3 (the number of iron atoms around each central atom at a distance of approximate to 3.50 Angstrom) has a monotonous evolution with time. It seems that the growth of nuclei is associated with the increase of the amount of double-corner sharing. edge-sharing linkages between Fe octahedra are associated with the early steps of the nucleation, and single-corner linkages are present in all samples. In the case of the hydrolysis of ferric nitrate salts, the local structure of oligomers does not prefigure the structure of the well crystallized infinite phase as opposed to ferric chloride salts and Cr. [References: 28]
机译:硝酸铁溶液(0.1 M)的部分水解和最小的低聚物的结构演变通过使用X射线吸收光谱在室温下1小时到20天之间的老化时间进行了研究。样品随时间变化,取决于水解率。在相同的老化时间t,中心原子的原子环境中的铁原子数随水解率的增加而增加,但增长没有遵循确定的途径。只有N3(每个中心原子周围大约3.50埃的铁原子数)随时间单调演化。似乎原子核的增长与双角共享量的增加有关。 Fe八面体之间的边缘共享键与成核的早期步骤有关,并且所有样品中都存在单角键。在水解硝酸铁盐的情况下,与氯化铁盐和Cr相反,低聚物的局部结构未预示充分结晶的无限相的结构。 [参考:28]

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