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Open AccessArticle

The Influence of Silica Nanoparticles on Ionic Liquid Behavior: A Clear Difference between Adsorption and Confinement

1
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
2
Graduate University of Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2013, 14(10), 21045-21052; https://doi.org/10.3390/ijms141021045
Received: 12 August 2013 / Revised: 26 September 2013 / Accepted: 29 September 2013 / Published: 18 October 2013
The phase behaviors of ionic liquids (ILs) confined in nanospace and adsorbed on outer surface of nanoparticles are expected to be different from those of the bulk. Anomalous phase behaviors of room temperature ionic liquid tributylhexadecylphosphonium bromide (P44416Br) confined in ordered mesoporous silica nanoparticles with average pore size 3.7 nm and adsorbed on outer surface of the same silica nanoparticles were reported. It was revealed that the melting points (Tm) of confined and adsorbed ILs depressed significantly in comparison with the bulk one. The Tm depressions for confined and adsorbed ILs are 8 °C and 14 °C, respectively. For comparison with the phase behavior of confined P44416Br, 1-butyl-3-methylimidazolium bromide (BmimBr) was entrapped within silica nanopores, we observed an enhancement of 50 °C in Tm under otherwise similar conditions. The XRD analysis indicates the formation of crystalline-like phase under confinement, in contrast to the amorphous phase in adsorbed IL. It was confirmed that the behavior of IL has clear difference. Moreover, the complex π-π stacking and H-bonding do not exist in the newly proposed phosphonium-based IL in comparison with the widely studied imidazolium-based IL. The opposite change in melting point of P44416[email protected]2 and [email protected]2 indicates that the cationic species plays an important role in the variation of melting point. View Full-Text
Keywords: confinement; adsorption; ionic liquid; melting point; phase behavior confinement; adsorption; ionic liquid; melting point; phase behavior
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MDPI and ACS Style

Wang, Y.; Li, C.; Guo, X.; Wu, G. The Influence of Silica Nanoparticles on Ionic Liquid Behavior: A Clear Difference between Adsorption and Confinement. Int. J. Mol. Sci. 2013, 14, 21045-21052. https://doi.org/10.3390/ijms141021045

AMA Style

Wang Y, Li C, Guo X, Wu G. The Influence of Silica Nanoparticles on Ionic Liquid Behavior: A Clear Difference between Adsorption and Confinement. International Journal of Molecular Sciences. 2013; 14(10):21045-21052. https://doi.org/10.3390/ijms141021045

Chicago/Turabian Style

Wang, Yaxing; Li, Cheng; Guo, Xiaojing; Wu, Guozhong. 2013. "The Influence of Silica Nanoparticles on Ionic Liquid Behavior: A Clear Difference between Adsorption and Confinement" Int. J. Mol. Sci. 14, no. 10: 21045-21052. https://doi.org/10.3390/ijms141021045

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