physical properties of the ionic liquids
DESCRIPTION
Transition of Ionic Liquid [bmim][PF 6 ] from Liquid to High-Melting-Point Crystal When Confined in Multiwalled Carbon Nanotubes. Physical Properties of the Ionic Liquids. (1)They are good solvents for a wide range of both inorganic and organic materials - PowerPoint PPT PresentationTRANSCRIPT
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Transition of Ionic Liquid [bmim][PF6] from Liquid to High-Me
lting-PointCrystal When Confined in Multi
walled Carbon Nanotubes
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(1)they are used in
huge amounts and
(2)they are usually volatile liquids that
are difficult to contain.
(1)They are good solvents for a wide range of both inorganic and organic materials(2)They are often composed of poorly coordinating ions, so they have the potential to be highly polar yet noncoordinating solvents.(3)polar alternative for two-phase systems(4)Ionic liquids are nonvolatile,hence they may be used in high-vacuum systems
Physical Properties of the Ionic Liquids
Welton, T. Chem. Rev. 1999, 99, 2071-2083.
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Crystallization of Low-Melting Ionic Liquids
1-butyl-3-methylimidazolium hexafluorophosphate[bmim][PF6]
NHPF6
Winterton, N. et. al. J. Am. Chem. Soc. 2005, 127, 16792-16793.
collected at -100 oC
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Ice NanotubesInside Carbon Nanotubes
Koga, K. et. al. Nature. 2001, 6, 802-805.
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Impregnated Nanotubes with IL
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Synthesis for IL@MWNTs
MWNTs + [bmim][PF6]
sonication
3 hrs, 90oCIL@MWNTs
MWNTs + [bmim][PF6] + methanolsonication
3 hrs, 90oCIL/methanol@MWNTs
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Figure 1. TEM images of opened MWNTs (a), IL@MWNTs (b),IL/MeOH@MWNTs (c), and HRTEM image of a small section of an individual tube of IL@MWNTs (d). (Inset) Electrondiffraction of a selected area of an individual nanotube filled with [bmim][PF6].
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X-ray Diffraction Pattern
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Figure 2. DSC heating curves for MWNTs (a), [bmim][PF6] (b),IL@MWNTs (c), and IL/MeOH@MWNTs (d) at a scan rate of 10 °C/min.
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Conclusions
• The author demonstrated for the first time the
crystallization behavior of IL inside MWNTs, resulting in the formation of a stable, polymorphous crystal possessing a melting point of above 200 °C.
• Not only provide a good addition to the development of new types of CNT-based composites, but they also are helpful for the understanding of phase transitions of dimensionally confined environments.