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

Dan Xu, Chris Hodges, Yulong Ding, Simon Biggs, Anju Brooker, David York

Research output: Contribution to journalArticle

20 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)8366-8372
Number of pages7
JournalLangmuir
Volume26
Issue number11
DOIs
Publication statusPublished - 1 Jun 2010
Externally publishedYes

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