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Issue 41, 2017
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A novel explanation for the enhanced colloidal stability of silver nanoparticles in the presence of an oppositely charged surfactant

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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

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Publication details

The article was received on 11 Jul 2017, accepted on 03 Oct 2017 and first published on 03 Oct 2017


Article type: Paper
DOI: 10.1039/C7CP04662F
Citation: Phys. Chem. Chem. Phys., 2017,19, 28037-28043
  • Open access: Creative Commons BY-NC license
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    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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