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Nanoporosity Characteristics of Some Natural Clay Minerals and Soils

Published online by Cambridge University Press:  01 January 2024

R. Aringhieri
R. Aringhieri*
Affiliation:
CNR, Institute of Ecosystem Studies (ISE), Division of Soil Chemistry, Research Area, Via G. Moruzzi 1, 56124 Pisa, Italy
*
*E-mail address of corresponding author: roberto.aringhieri@ise.cnr.it
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Abstract

Limited information is available on microporosity in soils. A study was undertaken to investigate the micropore characteristics of four soil samples, with different particle-size distributions, and four natural silicate clay minerals. Specific surface area and the differential micropore-size distribution were taken into account to characterize the microstructure of the soils and clays. The micropore-size distributions showed a maximum contribution to the total microporosity by pores having an effective pore radius of ∼20 Å, thus indicating that that category of pore contributes more than others to the total microporosity of the system. For both soils and clays a good exponential correlation was found between the maximum contribution to the microporosity and their specific surface area. A linear relationship was also found between the microporosity of the soils and their clay content. It has been concluded that the micropore system formed by 20 Å pores is mainly located in the clay fraction of the soil, and contributes significantly to defining some of the most notable physicochemical properties of soils and clays.

Keywords

Clay MicroporosityMicropore-size DistributionSoil MicroporositySurface Area
Type
Research Article
Information
Clays and Clay Minerals , Volume 52 , Issue 6 , December 2004 , pp. 700 - 704
Copyright
Copyright © 2004, The Clay Minerals Society

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