Surfactant mediated particle aggregation in nonpolar solvents

Mojtaba Farrokhbin; Biljana Stojimirović; Marco Galli; Mohsen Khajeh Aminian; Yannick Hallez; Gregor Trefalt

doi:10.1039/C9CP01985E

Surfactant mediated particle aggregation in nonpolar solvents

Mojtaba Farrokhbin,

^ab Biljana Stojimirović,

^a Marco Galli,^a Mohsen Khajeh Aminian,^b Yannick Hallez^c and Gregor Trefalt

*^a

Author affiliations

* Corresponding authors

^a Department of Inorganic and Analytical Chemistry, University of Geneva, Sciences II, 30 Quai Ernest-Ansermet, 1205 Geneva, Switzerland
E-mail: gregor.trefalt@unige.ch

^b Department of Physics, Faculty of Sciences, Yazd University, Yazd 89195-741, Iran

^c Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, Toulouse, France

Abstract

The aggregation behavior of particles in nonpolar media is studied with time-resolved light scattering. At low surfactant concentrations particles are weakly charged and suspensions are not stable. The suspensions become progressively more stable with increasing surfactant concentration as particles become more highly charged. At high concentrations the particles become neutralized and aggregation is again fast. The theory of Derjaguin, Landau, Verwey, and Overbeek (DLVO) is able to predict the stability ratios quantitatively by using the experimentally measured surface charges, screening lengths and van der Waals forces.

This article is part of the themed collection: 2019 PCCP HOT Articles

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https://doi.org/10.1039/C9CP01985E

Article type

Paper

Submitted

09 Apr 2019

Accepted

06 Aug 2019

First published

08 Aug 2019

This article is Open Access

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Phys. Chem. Chem. Phys., 2019,21, 18866-18876

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Surfactant mediated particle aggregation in nonpolar solvents

M. Farrokhbin, B. Stojimirović, M. Galli, M. Khajeh Aminian, Y. Hallez and G. Trefalt, Phys. Chem. Chem. Phys., 2019, 21, 18866 DOI: 10.1039/C9CP01985E

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

Physical Chemistry Chemical Physics

Surfactant mediated particle aggregation in nonpolar solvents

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Surfactant mediated particle aggregation in nonpolar solvents

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