How the hydro-gel flocculation microstructure changes

Zbik, M. S., Williams, D. J., Song, Y-F and Wang, C.C. (2015) How the hydro-gel flocculation microstructure changes. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 469 11-19. doi:10.1016/j.colsurfa.2014.12.062


Author Zbik, M. S.
Williams, D. J.
Song, Y-F
Wang, C.C.
Title How the hydro-gel flocculation microstructure changes
Journal name Colloids and Surfaces A: Physicochemical and Engineering Aspects   Check publisher's open access policy
ISSN 0927-7757
1873-4359
Publication date 2015-03-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.colsurfa.2014.12.062
Open Access Status
Volume 469
Start page 11
End page 19
Total pages 9
Place of publication Amsterdam, The Netherlands
Publisher Elsevier
Collection year 2015
Language eng
Formatted abstract
Microstructural investigations were conducted to better understand the poor settling and dewatering of a clay mineral-rich slurry. Investigations of the flocculated microstructure in a 2.5 wt% smectite clay suspension in a moderately salty aqueous solution were conducted with the aid of a synchrotron-powered transmission X-ray microscope and a cryo-transmission electron microscope. These investigations enabled the study of the clay particles’ mutual configuration in three-dimensional arrangements within natural water environments without drying the samples. The observed microstructure was similar to that observed in Wyoming smectite suspensions. A transition was observed from the “net of flakes” in monovalent cations in solution to the “Bander” model, when bivalent cations were present in the solution. As these structural models differ significantly from each other, the physical properties of the resulting gel also demonstrated remarkable diversities. These findings may play a crucial role in understanding smectite gel behaviour and its aggregating nature, which are of interest across many industries and are important in designing the most suitable technology to deal with colloidal stability.
Keyword Clay interaction
Clay microstructure
Clay suspension
Gel structure
Smectite suspension
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2016 Collection
 
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