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Hydrophobic attraction may contribute to aqueous flocculation of clays

Zbik, Marek and Horn, Roger G. 2003, Hydrophobic attraction may contribute to aqueous flocculation of clays, Colloids and surfaces A : physicochemical and engineering aspects, vol. 222, no. 1-3, pp. 323-328, doi: 10.1016/S0927-7757(03)00250-4.

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Title Hydrophobic attraction may contribute to aqueous flocculation of clays
Author(s) Zbik, Marek
Horn, Roger G.
Journal name Colloids and surfaces A : physicochemical and engineering aspects
Volume number 222
Issue number 1-3
Start page 323
End page 328
Total pages 6
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2003-07-30
ISSN 0927-7757
1873-4359
Keyword(s) kaolinite
birdwood kaolin
hydrophobic force
colloid gelation
Summary SEM observations of low solid content vitrified clay suspensions reveal that clay platelets build porous three-dimensional networks with platelets contacting each other mostly by their edges. To explain this behaviour, which must require long range edge-to-edge (EE) attractive forces, a hydrophobic-like interaction has been proposed. This interaction may be induced by the presence of nano-bubbles existing on the edges of clay crystals which may cause clay particles to flocculate. The following indirect evidence for such hydrophobic behaviour is presented. First, a clay platelet is shown attached to an oil drop by its edge; second, clay flocs were attracted by a vertically placed Teflon strip but not to the hydrophilic mica basal surface; third, a much thicker porous sediment occurred in CO2-saturated water solution compared with vacuum degassed water.
Language eng
DOI 10.1016/S0927-7757(03)00250-4
Field of Research 029999 Physical Sciences not elsewhere classified
Socio Economic Objective 970102 Expanding Knowledge in the Physical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2003, Elsevier Science B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30041495

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