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A study of the thickness of ferrihydrite coatings on kaolinite

Published online by Cambridge University Press:  05 July 2018

Angela A. Jones  and
Adil M. Saleh
Angela A. Jones
Affiliation:
Department of Soil Science, University of Reading, Reading, Berkshire RG1 5AQ
Adil M. Saleh
Affiliation:
Department of Soil Science, University of Reading, Reading, Berkshire RG1 5AQ
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Abstract

The form and thickness of the ferrihydrite coating on kaolinite basal surfaces was studied in mixes containing 1–10% ferrihydrite through a combination of TEM, shadowed replicas, selected area electron diffraction, and determinations of surface area and distribution of charge on the surfaces. At pH3 the ferrihydrite was found to attach initially as single particles to certain sites on the kaolinite. These particles grew laterally and vertically until with 4% ferrihydrite they were aggregates of from 8 to 25 layers of particles. With more ferrihydrite the aggregates coalesced. Despite the irregular cover on the kaolinite satisfactory electron diffraction patterns were obtained and as little as 2% ferrihydrite was detected in a mixture at pH3.

Keywords

ferrihydriteiron oxidemineral coatingkaoliniteelectron diffraction
Type
Electron Microscopy in Mineralogy and Petrology
Information
Mineralogical Magazine , Volume 51 , Issue 359 , March 1987 , pp. 87 - 92
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

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