Journal
CHEMISTRY OF MATERIALS
Volume 24, Issue 7, Pages 1386-1392Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm300424v
Keywords
ionic-liquid; electrolytes; nanoparticles; crystallization; tethered molecules
Funding
- King Abdullah University of Science and Technology (KAUST) [KUS-C1-018-02]
- National Science Foundation [DMR-1006323]
- National Science Foundation Energy & Sustainability IGERT at Cornell
- Division Of Graduate Education
- Direct For Education and Human Resources [1045513] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1006323] Funding Source: National Science Foundation
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We report a novel class of silica ionogels created by dispersing silica nanoparticles densely grafted with the ionic liquid (IL) 1-trimethoicysilyl propyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl) imide (SpmImTSFI) in a 1-butyl-3-methyl-pyrrolidiniurn bis(trifluoromethylsulfonyl) imide (BmpyrTFSI) IL host. We find that over the entire range of nanoparticle volume fractions studied the systems exist as stable suspensions of SiO2-SpmImTFSI in the BmpyrTFSI host. Remarkably, we also find that addition of even minute quantities of SiO2-SpmImTFSI to the BmpyrTFSI IL suppresses crystallization of the host. The resulting disordered hybrid fluids exhibit liquid-like transport properties over a vastly extended temperature range; they open the way for facile synthesis of ILs with extended operating temperature windows. These observations are explained in terms of ionic coupling of the nanoparticle-tethered and free TFSI anions, which is thought to suppress crystallization of BmpyrTFSI.
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