Study on Genesis and Deposition of Clay Minerals

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Earth Sciences".

Deadline for manuscript submissions: closed (20 June 2023) | Viewed by 2771

Special Issue Editors


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Guest Editor
Geosciences Department, Geobiotec Research Unit, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
Interests: clays and clay minerals; industrial minerals in general and traditional building materials; medical geology; coastal and marine geology
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Center for Petrology and Geochemistry Studies, Campus do Vale, Institute of Geosciences, Federal University of Rio Grande do Sul, Porto Alegre 91501-970, Brasil
Interests: authigenic clay minerals; X-ray diffraction; characterization of clay minerals; hydrothermalism; soil science; weathering
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Deposits of clays may have complex origins. One deposit is not like another of the same material, but integrative genetic models can produce useful patterns for exploration purposes. Clays occur in many different geological environments: weathering crusts and soils, continental and marine sediments, volcanic deposits, geothermal fields, wallrock alteration produced by the intrusion of plutonic rocks and hydrothermal fluids, and very low-grade metamorphic rocks. Clay formation and evolution are distinctive events in the geological history of a basin. The source area, transport, depositional environment of clays, and transformation and diagenetic changes are fundamental for the analysis of sedimentary basins.

Prof. Dr. Fernando Rocha
Prof. Dr. André Sampaio Mexias
Guest Editors

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Published Papers (1 paper)

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16 pages, 1037 KiB  
Technical Note
Relation of EDL Forces between Clay Particles Calculated by Different Methods
by Xiang-Yu Shang, Ke Duan, Lian-Fei Kuang and Qi-Yin Zhu
Appl. Sci. 2022, 12(11), 5591; https://doi.org/10.3390/app12115591 - 31 May 2022
Viewed by 2265
Abstract
Calculation of the electrostatic double layer force (EDL force) between clay particles is relevant as it is closely related to important macroscopic mechanical behaviors of clays. The popular method to calculate the EDL force is to integrate the electric potential and Maxwell stress [...] Read more.
Calculation of the electrostatic double layer force (EDL force) between clay particles is relevant as it is closely related to important macroscopic mechanical behaviors of clays. The popular method to calculate the EDL force is to integrate the electric potential and Maxwell stress along the boundary enclosing a simply connected domain within which a clay particle resides. The EDL force has also been calculated by the integration of the electrostatic force density over the preceding domain. However, the subtle relation of the EDL forces calculated by the different existing methods has not yet been investigated. By means of theoretical analysis and finite element simulation, it was shown that the force calculated by the integration of Maxwell stress along the complete boundary enclosing a multiply connected domain in which the clay particle is excluded, and that along the partial boundary enclosing the preceding simply connected domain represents the electrical attractive force and osmotic repulsive force, respectively, while the integration of the potential along both the same complete and partial boundary denotes the osmotic force. Numerical results showed that the calculated EDL force deviates from its actual value significantly with the decrease in distance between the chosen integral boundary and particle surface, and the deviation varies with surface potential and angle between particles. Moreover, the recommended minimum distance was proposed to be 10 times the thickness of the particle based on the present simulation results. Full article
(This article belongs to the Special Issue Study on Genesis and Deposition of Clay Minerals)
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