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Influence of Co-Ion Nature on the Gelation Kinetics of Colloidal Silica Suspensions

Trompette, Jean-Luc Influence of Co-Ion Nature on the Gelation Kinetics of Colloidal Silica Suspensions. (2017) Journal of Physical Chemistry B, 121 (22). 5654-5659. ISSN 1520-6106

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Official URL: http://doi.org/10.1021/acs.jpcb.7b03007


The influence of the nature of three representative monovalent co-ions on the gelation kinetics of Ludox suspensions has been investigated. At a given Ludox volume fraction and for the same concentration of potassium salt, the gelation time is longer as the studied anion presents a more pronounced kosmotrope character. As the screening of the silica surface charge is similar since the same cationic counterion is taken, these results highlight the unexpected role played by hydration effects imparted by the co-ions when particles are pushed together as gelation proceeds. This reveals that jamming transitions of nanoparticle fluids may be finely tuned by changing the co-ion nature in spite of the fact that the cationic counterion is the same.

Item Type:Article
HAL Id:hal-01890088
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
Deposited On:08 Oct 2018 10:09

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