Size and charge constraints in microaggregation: Model experiments with mineral particle size fractions

Size and charge constraints in microaggregation: Model experiments with mineral particle size fractions

In natural soil systems the mass ratio of clay minerals and Fe oxides is decisive for aggregate formation and stability but little information exists on the importance of size constrains in microaggregation. Therefore, we determined the aggregation kinetics of mono- and dual-mineral mixtures at pH 6...

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Bibliographic Details
Published in:Applied clay science 2019-03, Vol.170, p.29-40
Main Authors: Dultz, S., Woche, S.K., Mikutta, R., Schrapel, M., Guggenberger, G.
Format: Article
Language:eng
Subjects:
Aggregate stability
Aggregation
Goethite
Illite
Particle size fractions
XPS
Zeta potential
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Summary:In natural soil systems the mass ratio of clay minerals and Fe oxides is decisive for aggregate formation and stability but little information exists on the importance of size constrains in microaggregation. Therefore, we determined the aggregation kinetics of mono- and dual-mineral mixtures at pH 6 by dynamic light scattering, using three size fractions of model minerals (goethite and illite). Aggregates were characterized by scanning electron microscopy (SEM), and measured for zeta potential (ζ), surface chemical composition by X-ray photoelectron spectroscopy (XPS), and specific surface area (SSA). Destabilization experiments using sonication revealed the stability against dispersion. Aggregation occurred in all homoaggregation experiments, particularly for fine illite (
ISSN:0169-1317
1872-9053