Journal
LANGMUIR
Volume 31, Issue 23, Pages 6289-6297Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.5b00632
Keywords
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Funding
- Royal Society (UK)
- Foundation for Fundamental Research on Matter's (Stichting FOM) Jamming and Rheophysics program
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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 C-s. Increasing C-s, 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 C the interface is highly packed, and an overall solidlike response is observed, with 2D glass properties.
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