NDLI: Density and porosity of bentonites

Content Provider	Springer Nature Link
Author	Kaufhold, S. Plötze, M. Klinkenberg, M. Dohrmann, R.
Copyright Year	2012
Abstract	The calculation and measurement of the densities of smectites proved that calculation can lead to accurate values if the smectite d$_{001}$-value, water content, molar mass of one formula unit, interlayer composition, and layer charge density are considered. The density measurement was supposed to be affected by accommodation of some He in micropores. The specific surface area determined by the common N$_{2}$ adsorption is largely affected by micropores which in turn was used as proxy for microporosity. The investigated materials show a wide range of microporosities (5–65 % of the total porosity up to 50 μm). Micropores are supposed to result from the imperfect stacking of single TOT layers resulting in the quasi crystalline overlap region but they also result from partial access of the interlayer at the edges. Unfortunately, both types of microporosity could not be distinguished quantitatively. For measurement of the microporosity both N$_{2}$ and CO$_{2}$ adsorption were found to be suitable. The mesoporosity of bentonites also covers a significant range. One particularly mesoporous material was identified both by N$_{2}$ adsorption and mercury intrusion. SEM investigation suggests the fibrous microstructure to be responsible for the extraordinary mesoporosity. For the characterization of the mesoporosity, N$_{2}$ adsorption showed best resolution. The macroporosity may be classified according to the type of aggregates observable by SEM. The typical rose like arrangement of smectites results in 1 μm macropores and relict structures of the volcanic glass particles result in larger pores. The third type of macropore simply results from the relative arrangement of aggregates.
Starting Page	191
Ending Page	208
Page Count	18
File Format	PDF
ISSN	13802224
Journal	Journal of Porous Materials
Volume Number	20
Issue Number	1
e-ISSN	15734854
Language	English
Publisher	Springer US
Publisher Date	2012-04-10
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bentonite Porosity Microstructure Density of smectites Catalysis Characterization and Evaluation of Materials Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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