Interfacial Assembly of Surfactant-Decorated Nanoparticles: On the Rheological Description of a Colloidal 2D Glass

Armando Maestro, Omkar Deshmukh, Friedrich Gunther Mugele, D. Langevin

Research output: Contribution to journalArticleAcademicpeer-review

35 Citations (Scopus)

Abstract

We address the rheology of assemblies of surfactant-decorated silica nanoparticles irreversibly adsorbed at the gas/liquid interface. Positively charged surfactant molecules (such as CTAB) bind to silica nanoparticle surfaces, and the resulting particle–surfactant complexes adsorb at gas/liquid interfaces. The surfactant molecules control the wettability of such decorated nanoparticles and their adsorption. The interparticle forces can be tuned by changing the surfactant concentration Cs. Increasing Cs, in addition to a decrease of the particles wettability, leads to an increase of the area fraction of particles at the interface. Oscillatory shear measurements (strain- and frequency-sweep) have been performed. Here, we explore the effect of the surfactant concentration Cs. At high enough Cs, the interface is highly packed, and an overall solidlike response is observed, with 2D glass properties.
Original languageEnglish
Pages (from-to)6289-6297
JournalLangmuir
Volume31
Issue number23
DOIs
Publication statusPublished - 2015

Keywords

  • METIS-312107
  • IR-97582

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