Surface Thermodynamic Properties of Micas and Related Layer Silicate Minerals
作者:
R. F. Giese,
W Wu,
C. J. van Oss,
期刊:
Journal of Dispersion Science and Technology
(Taylor Available online 1998)
卷期:
Volume 19,
issue 6-7
页码: 775-783
ISSN:0193-2691
年代: 1998
DOI:10.1080/01932699808913214
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The surface tension values for a series of 2:1 phyllosilicate minerals with different structural characteristics and layer charges ranging from 0 to 2 per O10group have been examined. The average Lifshitz-van der Waals component (ΓLW)value is 40.3 ± 1.9 mJ/m2, and the average Lewis acid (®) parameter is 1.2 ± 0.6 mJ/2for those minerals with a layer charge greater than zero. In contrast, the Lewis base parameter (γe) varied greatly from a maximum of 59.7 mJ/m to a minimum of 23.7 mJ/m2. Those minerals with a layer charge of zero (three samples) had smaller γLWvalues of 32.0 ± 1.6 mJ/m2, slightly larger γ® values of 2.0 ± 0.4 mj/m2and significantly smaller values of γ® of 4.5 ± 1.6 mJ/m2. The hydrophobic versus hydrophilic character of these materials is largely governed by the value of γ° which is strongly related to the value of the layer charge.
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