期刊
APPLIED CLAY SCIENCE
卷 74, 期 -, 页码 58-65出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.clay.2012.10.003
关键词
Kaolinite; Surface characteristics; Morphology; Thermostability; Crystallinity; Zeta potential
资金
- National Natural Science Foundation for Distinguished Young Scholars of China
- Scientific Research Foundation for ROCS [2011-1139]
- Hunan Provincial Innovation Foundation for Postgraduates [CX2010B042]
- Excellent PhD Thesis Support Foundation of Central South University [2010ybfz056]
The physicochemical aspects of four soft kaolins were investigated using X-ray diffraction (XRD), scanning electronic microscopy (SEM), transmission electron microscopy (TEM), Fourier transformation infrared spectroscopy (FTIR), differential scanning calorimetry-thermogravimetry (DSC-TG) specific surface area and surface zeta potential measurements. The correlation between degree of crystal order, thermal stability, morphology and surface characteristics of the kaolinites were examined and discussed. The endothermic peak temperatures, in particular, showed a clear positive correlation with the calculated crystallinity index of the kaolinites. The physicochemical characteristics of a natural kaolinite rod were considered in greater detail. Rod-like kaolinite had lower degree of order and zeta potential (pH<3) than the platy kaolinites but was more ordered than expected for halloysite, and did not show a distinct central void. A schematic morphology for the proposed arrangement of curved kaolinite layers making up the rods is presented. (C) 2012 Elsevier B.V. All rights reserved.
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