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Swelling transition of a clay induced by heating

In English

Författare

  • Elisabeth Hansen
  • Henrik Hemmen Hemmen
  • Davi Fonseca
  • C Coutant
  • K. D. Knudsen
  • Tomás Plivelic
  • D. Bonn

Summary, in English

Clays are of paramount importance for soil stability, but also in applications ranging from oil recovery to composites and hydrogels. Generically, clays are divided into two subclasses: macroscopically swelling, ‘active’ clays that have the capacity for taking up large amounts of water to form stable gels, and ‘passive’ or non-swelling clays; the former stabilize soils whereas the latter are known to lead to landslides. However, it has been unclear so far what mechanisms underlie clay swelling. Here, we report the first observation of a temperature-induced transition from a passive to an active, swelling clay. We propose a simple description of the swelling transition; while net attractive interactions are dominant at low temperatures so that the clay particles remain attached to each other in stacks, at higher temperatures it is energetically favourable for the clay to swell due to the entropy that is gained by counterions which are liberated during swelling.

Publiceringsår

2012

Språk

Engelska

Publikation/Tidskrift/Serie

Scientific Reports

Volym

2

Dokumenttyp

Artikel i tidskrift

Förlag

Nature Publishing Group

Ämne

  • Physical Sciences
  • Natural Sciences

Nyckelord

  • clays
  • swelling
  • X-ray scattering
  • Rheology

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 2045-2322