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Issue 1, 2018
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Attractive non-DLVO forces induced by adsorption of monovalent organic ions

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Abstract

Direct force measurements between negatively charged colloidal particles were carried out using an atomic force microscope (AFM) in aqueous solutions containing monovalent organic cations, namely tetraphenylarsonium (Ph4As+), 1-hexyl-3-methylimidazolium (HMIM+), and 1-octyl-3-methylimidazolium (OMIM+). These ions adsorb to the particle surface, and induce a charge reversal. The forces become attractive at the charge neutralization point, but they are stronger than van der Waals forces. This additional and unexpected attraction decays exponentially with a decay length of a few nanometers, and is strikingly similar to the one previously observed in the presence of multivalent ions. This attractive force probably originates from coupled spontaneous charge fluctuations on the respective surfaces as initially suggested by Kirkwood and Shumaker.

Graphical abstract: Attractive non-DLVO forces induced by adsorption of monovalent organic ions

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Article information


Submitted
18 Sep 2017
Accepted
30 Nov 2017
First published
30 Nov 2017

Phys. Chem. Chem. Phys., 2018,20, 158-164
Article type
Paper

Attractive non-DLVO forces induced by adsorption of monovalent organic ions

A. M. Smith, P. Maroni and M. Borkovec, Phys. Chem. Chem. Phys., 2018, 20, 158
DOI: 10.1039/C7CP06383K

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