A QCM study on the adsorption of colloidal laponite at the solid/liquid interface

Xu, Dan, Hodges, Chris, Ding, Yulong, Biggs, Simon, Brooker, Anju and York, David (2010) A QCM study on the adsorption of colloidal laponite at the solid/liquid interface. Langmuir, 26 11: 8366-8372. doi:10.1021/la904784a


Author Xu, Dan
Hodges, Chris
Ding, Yulong
Biggs, Simon
Brooker, Anju
York, David
Title A QCM study on the adsorption of colloidal laponite at the solid/liquid interface
Journal name Langmuir   Check publisher's open access policy
ISSN 0743-7463
1520-5827
Publication date 2010-06-01
Sub-type Article (original research)
DOI 10.1021/la904784a
Open Access Status
Volume 26
Issue 11
Start page 8366
End page 8372
Total pages 7
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Abstract The adsorption of colloidal laponite at the solid/liquid interface on various substrates and over a range of laponite concentrations (10-1000 ppm) has been investigated. Although a wide range of surfaces were studied, only on a positively charged poly(diallyldimethylammonium chloride) (PDADMAC) surface was any adsorption of the laponite observed. This shows that when fully wetted, laponite adsorption depends primarily on the surface charge rather than, the degree of hydrophobicity of the surface. The adsorption of spherical Ludox silica nanoparticles on PDADMAC surfaces was also examined for comparison with the disklike laponite. The QCM data for both laponite and Ludox show strong adsorption on PDADMAC surfaces; however, larger frequency shifts were seen for Ludox than laponite at all concentrations tested, Within the concentration range examined in this work, the dissipation data from the QCM suggested a simple monolayer formation for Ludox but a monolayer to multilayer transition for laponite as the concentration increases.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Faculty of Engineering, Architecture and Information Technology -- Student Publications
 
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