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

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Documents

  • c7cp04662f

    Final published version, 2 MB, PDF document

DOI

  • Sara Skoglund, KTH Royal Institute of Technology
  • ,
  • Eva Blomberg, KTH Royal Institute of Technology, RISE Research Institutes of Sweden
  • ,
  • Inger Odnevall Wallinder, KTH Royal Institute of Technology
  • ,
  • Isabelle Grillo, Institut Laue Langevin, DS/LSS
  • ,
  • Jan Skov Pedersen
  • L. Magnus Bergstrom, KTH Royal Institute of Technology

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.

Original languageEnglish
JournalPhysical Chemistry Chemical Physics
Volume19
Issue41
Pages (from-to)28037-28043
Number of pages7
ISSN1463-9076
DOIs
Publication statusPublished - 7 Nov 2017

    Research areas

  • ANGLE NEUTRON-SCATTERING, X-RAY-SCATTERING, MICROEMULSION MEDIA, RAMAN-SCATTERING, AQUEOUS-MEDIA, WATER, SUSPENSIONS, RELEASE, SIZE

See relations at Aarhus University Citationformats

Download statistics

No data available

ID: 118602277