Issue 41, 2017

A novel explanation for the enhanced colloidal stability of silver nanoparticles in the presence of an oppositely charged surfactant

Abstract

The structural behavior in aqueous mixtures of negatively charged silver nanoparticles (Ag NPs) together with the cationic surfactants cetyltrimethylammonium bromide (CTAB) and dodecyltrimethylammonium chloride (DTAC), respectively, has been investigated using SANS and SAXS. From our SANS data analysis we are able to conclude that the surfactants self-assemble into micellar clusters surrounding the Ag NPs. We are able to quantify our results by means of fitting experimental SANS data with a model based on cluster formation of micelles with very good agreement. Based on our experimental results, we propose a novel mechanism for the stabilization of negatively charged Ag NPs in a solution of positively charged surfactants in which cluster formation of micelles in the vicinity of the particles prevents the particles from aggregating. Complementary SAXS and DLS measurements further support this novel way of explaining stabilization of small hydrophilic nanoparticles in surfactant-containing solutions.

Graphical abstract: A novel explanation for the enhanced colloidal stability of silver nanoparticles in the presence of an oppositely charged surfactant

Supplementary files

Article information

Article type
Paper
Submitted
11 Jul 2017
Accepted
03 Oct 2017
First published
03 Oct 2017
This article is Open Access
Creative Commons BY-NC license

Phys. Chem. Chem. Phys., 2017,19, 28037-28043

A novel explanation for the enhanced colloidal stability of silver nanoparticles in the presence of an oppositely charged surfactant

S. Skoglund, E. Blomberg, I. O. Wallinder, I. Grillo, J. S. Pedersen and L. M. Bergström, Phys. Chem. Chem. Phys., 2017, 19, 28037 DOI: 10.1039/C7CP04662F

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