Dispersions of silica nanoparticles in ionic liquids investigated with advanced rheology |
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Authors: | Alexandra Wittmar David Ruiz-Abad Mathias Ulbricht |
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Institution: | (1) Lehrstuhl f?r Technische Chemie II, Universit?t Duisburg-Essen, 45141 Essen, Germany;(2) CeNIDE—Centre for Nanointegration Duisburg-Essen, 47057 Duisburg, Germany; |
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Abstract: | The colloidal stabilities of dispersions of unmodified and surface-functionalized SiO2 nanoparticles in hydrophobic and hydrophilic imidazolium-based ionic liquids were studied with advanced rheology at three
temperatures (25, 100, and 200 °C). The rheological behavior of the dispersions was strongly affected by the ionic liquids
hydrophilicity, by the nanoparticles surface, by the concentration of the nanoparticles in the dispersion as well as by the
temperature. The unmodified hydrophilic nanoparticles showed a better compatibility with the hydrophilic ionic liquid. The
SiO2 surface functionalization with hydrophobic groups clearly improved the colloidal stability of the dispersions in the hydrophobic
ionic liquid. The temperature increase was found to lead to a destabilization in all studied systems, especially at higher
concentrations. The results of this study imply that ionic liquids with tailored properties could be used in absorbers directly
after reactors for gas-phase synthesis of nanoparticles or/and as solvents for their further surface functionalization without
agglomeration or aggregation. |
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