کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5468490 | 1519038 | 2017 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Insights into the formation mechanism of imogolite from a full-range observation of its sol-gel growth
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
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چکیده انگلیسی
Imogolite (Imo) was prepared via a sol-gel method. The time-dependent changes in its morphology, structure and texture during the whole synthesis process (from amorphous precursors to the final products through nanoscale intermediates) were monitored by atomic force microscopy (AFM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR) and N2 physisorption. The results showed that a shape transition from a spherical open imogolite local structure (ImoLS) to a tubular open ImoLS occurred in the process of proto-imogolite (proto-Imo) formation. Based on the overall structure of the obtained solid products and the occurring main reactions, Imo synthesis process was described in five steps: i) formation of amorphous precursors by hydrolysis and condensation of Al and Si; ii) formation of proto-Imo with an open ImoLS at the expense of the amorphous precursors; iii) open ImoLS dominates; it grows and assembles into the first closed ImoLS (tubes and spheres); iv) closed ImoLS dominates and continues to form (mainly tubes) at the expense of open ImoLS; and v) no more open ImoLS; further growth of already-formed Imo via oriented aggregation. These findings provide new insights into the formation mechanism and structure of proto-Imo and Imo, which helps to clarify the Imo synthesis procedure.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Clay Science - Volume 150, 15 December 2017, Pages 115-124
Journal: Applied Clay Science - Volume 150, 15 December 2017, Pages 115-124
نویسندگان
Peixin Du, Peng Yuan, Antoine Thill, Faïza Annabi-Bergaya, Dong Liu, Shun Wang,