Issue 7, 2009
From the journal:

Soft Matter

The hydrophobic effect as a driving force for charge inversion in colloids

Alberto Martín-Molina,a   Carles Calero,b   Jordi Faraudo,*b   Manuel Quesada-Pérez,c   Alex Travessetd  and  Roque Hidalgo-Álvareza  

* Corresponding authors

a Grupo de Física de Fluidos y Biocoloides, Dpto. Física Aplicada, Univ. de Granada, 18071 Granada, Spain

b Institut de Ciencia de Materials de Barcelona (ICMAB-CSIC), Campus de la UAB, E-08193 Bellaterra, Spain
E-mail: jfaraudo@icmab.es

c Departamento de Física, Universidad de Jaén, Escuela Politécnica Superior, 23700 Linares, Spain

d Department of Physics and Astronomy and Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA

Abstract

A new mechanism for charge inversion of colloids in electrolyte solutions based on the hydrophobic effect is presented. We show that this mechanism is able to induce charge inversion at low concentrations (∼mM) of monovalent ions containing hydrophobic functional groups and present for the first time experimental evidence of this prediction. We provide a simple mean field theoretical model that successfully describes the experimental data up to charge inversion. Saturation effects appearing at higher concentrations are also discussed.

Graphical abstract: The hydrophobic effect as a driving force for charge inversion in colloids

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Article information

DOI
https://doi.org/10.1039/B820489F
Article type
Communication
Submitted
17 Nov 2008
Accepted
03 Feb 2009
First published
16 Feb 2009

Soft Matter, 2009,5, 1350-1353

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The hydrophobic effect as a driving force for charge inversion in colloids

A. Martín-Molina, C. Calero, J. Faraudo, M. Quesada-Pérez, A. Travesset and R. Hidalgo-Álvarez, Soft Matter, 2009, 5, 1350 DOI: 10.1039/B820489F

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