Underlying Basis for the Effects of Iron Oxidation State on Clay Swelling.

Abstract

The effect of iron(II) in the crystal structure of the clay mineral nontronite on the fraction of clay layers that become completely collapsed was measured directly using a 2-ethoxyethanol surface area technique. Measurements showed that up to 28% of the clay layers became completely collapsed as a result of Fe reduction. X-ray diffraction results also showed that may layers become partially collapsed. Since the combined fraction of these types of layers increased with increasing Fe(II) content in the clay and neither of these types of layers participates in the swelling process, one necessarily concludes that Fe(II) alters swelling by decreasing the number of layers that are capable of full expansion in the presence of water.

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Document Details

Document Type
Technical Report
Publication Date
Jan 12, 1988
Accession Number
ADA190824

Entities

People

  • Joseph W. Stucki

Organizations

  • University of Illinois Urbana–Champaign

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Absorption
  • Bacteria
  • Chemical Synthesis
  • Chemistry
  • Classification
  • Crystal Structure
  • Diffraction
  • Electron Transfer
  • Magnetic Properties
  • Microorganisms
  • Phyllosilicates
  • Scientists
  • Silicates
  • Soil Science
  • Spectra
  • X Rays
  • X-Ray Diffraction

Readers

  • Agricultural Chemistry/Soil Science
  • Chemistry (specifically Chemical Fluorescence)
  • Materials Science and Engineering.