Dispersions of silica nanoparticles in ionic liquids investigated with advanced rheology
The colloidal stabilities of dispersions of unmodified and surface-functionalized SiO 2 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 strong...
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| Veröffentlicht in: | Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology 2012-02, Vol.14 (2), p.1-10, Article 651 |
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| container_title | Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology |
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| creator | Wittmar, Alexandra Ruiz-Abad, David Ulbricht, Mathias |
| description | The colloidal stabilities of dispersions of unmodified and surface-functionalized SiO
2
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 SiO
2
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. |
| doi_str_mv | 10.1007/s11051-011-0651-1 |
| format | Article |
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2
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 SiO
2
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.</description><identifier>ISSN: 1388-0764</identifier><identifier>EISSN: 1572-896X</identifier><identifier>DOI: 10.1007/s11051-011-0651-1</identifier><language>eng</language><publisher>Dordrecht: Springer Netherlands</publisher><subject>Agglomeration ; Characterization and Evaluation of Materials ; Chemistry and Materials Science ; Colloids ; Dispersions ; Inorganic Chemistry ; Ionic liquids ; Lasers ; Materials Science ; Nanoparticles ; Nanotechnology ; Optical Devices ; Optics ; Photonics ; Physical Chemistry ; Research Paper ; Rheology ; Silica ; Silicon dioxide ; Stability</subject><ispartof>Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology, 2012-02, Vol.14 (2), p.1-10, Article 651</ispartof><rights>Springer Science+Business Media B.V. 2012</rights><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c349t-8e4cc1d5ed8bd14c1bd032a5f3f16d664212052cddb393d6239804662f3e186d3</citedby><cites>FETCH-LOGICAL-c349t-8e4cc1d5ed8bd14c1bd032a5f3f16d664212052cddb393d6239804662f3e186d3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s11051-011-0651-1$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s11051-011-0651-1$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,780,784,27924,27925,41488,42557,51319</link.rule.ids></links><search><creatorcontrib>Wittmar, Alexandra</creatorcontrib><creatorcontrib>Ruiz-Abad, David</creatorcontrib><creatorcontrib>Ulbricht, Mathias</creatorcontrib><title>Dispersions of silica nanoparticles in ionic liquids investigated with advanced rheology</title><title>Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology</title><addtitle>J Nanopart Res</addtitle><description>The colloidal stabilities of dispersions of unmodified and surface-functionalized SiO
2
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 SiO
2
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. 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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 SiO
2
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.</abstract><cop>Dordrecht</cop><pub>Springer Netherlands</pub><doi>10.1007/s11051-011-0651-1</doi><tpages>10</tpages></addata></record> |
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| subjects | Agglomeration Characterization and Evaluation of Materials Chemistry and Materials Science Colloids Dispersions Inorganic Chemistry Ionic liquids Lasers Materials Science Nanoparticles Nanotechnology Optical Devices Optics Photonics Physical Chemistry Research Paper Rheology Silica Silicon dioxide Stability |
| title | Dispersions of silica nanoparticles in ionic liquids investigated with advanced rheology |
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