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A novel explanation for the enhanced colloidal stability of silver nanoparticles in the presence of an oppositely charged surfactant
KTH Royal Institute of Technology, Sweden.
RISE - Research Institutes of Sweden, Bioscience and Materials, Chemistry, Materials and Surfaces. KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
Institut Laue Langevin, France.
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2017 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 19, no 41, p. 28037-28043Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2017. Vol. 19, no 41, p. 28037-28043
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Natural Sciences
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URN: urn:nbn:se:ri:diva-33174DOI: 10.1039/c7cp04662fScopus ID: 2-s2.0-85032624124OAI: oai:DiVA.org:ri-33174DiVA, id: diva2:1176596
Available from: 2018-01-22 Created: 2018-01-22 Last updated: 2018-01-22Bibliographically approved

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