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Journal of Nanoparticle Research

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01.02.2012 | Research Paper

Dispersions of silica nanoparticles in ionic liquids investigated with advanced rheology

verfasst von: Alexandra Wittmar, David Ruiz-Abad, Mathias Ulbricht

Erschienen in: Journal of Nanoparticle Research | Ausgabe 2/2012

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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.

Vorheriger Artikel Pyrophoricity of nano-sized aluminum particles

Nächster Artikel Use of a silver ion selective electrode to assess mechanisms responsible for biological effects of silver nanoparticles

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Titel: Dispersions of silica nanoparticles in ionic liquids investigated with advanced rheology
verfasst von: Alexandra Wittmar
David Ruiz-Abad
Mathias Ulbricht
Publikationsdatum: 01.02.2012
Verlag: Springer Netherlands
Erschienen in: Journal of Nanoparticle Research / Ausgabe 2/2012
Print ISSN: 1388-0764
Elektronische ISSN: 1572-896X
DOI: https://doi.org/10.1007/s11051-011-0651-1

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