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Kaolinite flocculation induced by smectite addition - a transmission X-ray microscopic study
Marek S Zbik1, Yen-Fang Song, Ray L Frost
1Faculty of Sciences and Technology, Queensland University of Technology, 2 George Street, GPO Box 2434, Brisbane QLD 4001, Australia.
Journal of Colloid and Interface Science
|July 13, 2010
Summary
Adding a small amount of smectite clay to kaolinite suspensions significantly enhances flocculation and particle orientation. This structural change, observed via microscopy, improves the plastic behavior of kaolinite-smectite mixtures.
Area of Science:
- Clay science
- Materials science
- Colloid chemistry
Background:
- Kaolinite suspensions exhibit random particle orientation.
- Understanding clay-clay interactions is crucial for material properties.
Purpose of the Study:
- To investigate the influence of smectite on kaolinite suspension structure.
- To elucidate the microstructural mechanisms behind observed macroscopic behavior.
Main Methods:
- Transmission X-ray Microscopy (TXM) and Scanning Electron Microscopy (SEM) for microstructural analysis.
- Sedimentation tests for macroscopic behavior screening.
- STatistic IMage Analysing (STIMAN) for micrograph processing and parameter calculation.
Main Results:
- Small additions of smectite (approx. 3 wt.%) to kaolinite suspensions (10 wt.%) significantly influenced flocculation.
- Micrographs revealed highly oriented particle fabric in kaolinite-smectite suspensions, with greatest density at 3 wt.% smectite.
- Pure kaolinite suspensions showed randomly oriented platelets, unlike the oriented structures in mixtures.
Conclusions:
- Smectite addition induces a highly oriented framework in kaolinite suspensions.
- Kaolinite platelets bond face-to-face within the smectite framework, strengthening the structure.
- This interaction leads to preferential platelet orientation and enhanced plastic behavior in kaolinite-smectite systems.
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