Amphiphilicity determines nanostructure in protic ionic liquids

Robert Hayes; Silvia Imberti; Gregory G. Warr; Rob Atkin

doi:10.1039/c0cp01137a

Amphiphilicity determines nanostructure in protic ionic liquids

Robert Hayes, Silvia Imberti, Gregory G. Warr, Rob Atkin

Research output: Contribution to journal › Article › peer-review

273 Citations (Scopus)

Abstract

The bulk structure of the two oldest ionic liquids (ILs), ethylammonium nitrate (EAN) and ethanolammonium nitrate (EtAN), is elucidated using neutron diffraction. The spectra were modelled using empirical potential structure refinement (EPSR). The results demonstrate that EAN exhibits a long-range structure of solvophobic origin, similar to a bicontinuous microemulsion or disordered L₃-sponge phase, but with a domain size of only 1 nm. The alcohol (-OH) moiety in EtAN interferes with solvophobic association between cation alkyl chains resulting in small clusters of ions, rather than an extended network.

Original language	English
Pages (from-to)	3237-3247
Number of pages	11
Journal	Physical Chemistry Chemical Physics
Volume	13
Issue number	8
DOIs	https://doi.org/10.1039/c0cp01137a
Publication status	Published - 28 Feb 2011
Externally published	Yes

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title = "Amphiphilicity determines nanostructure in protic ionic liquids",

abstract = "The bulk structure of the two oldest ionic liquids (ILs), ethylammonium nitrate (EAN) and ethanolammonium nitrate (EtAN), is elucidated using neutron diffraction. The spectra were modelled using empirical potential structure refinement (EPSR). The results demonstrate that EAN exhibits a long-range structure of solvophobic origin, similar to a bicontinuous microemulsion or disordered L3-sponge phase, but with a domain size of only 1 nm. The alcohol (-OH) moiety in EtAN interferes with solvophobic association between cation alkyl chains resulting in small clusters of ions, rather than an extended network.",

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AU - Hayes, Robert

AU - Imberti, Silvia

AU - Warr, Gregory G.

AU - Atkin, Rob

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Y1 - 2011/2/28

N2 - The bulk structure of the two oldest ionic liquids (ILs), ethylammonium nitrate (EAN) and ethanolammonium nitrate (EtAN), is elucidated using neutron diffraction. The spectra were modelled using empirical potential structure refinement (EPSR). The results demonstrate that EAN exhibits a long-range structure of solvophobic origin, similar to a bicontinuous microemulsion or disordered L3-sponge phase, but with a domain size of only 1 nm. The alcohol (-OH) moiety in EtAN interferes with solvophobic association between cation alkyl chains resulting in small clusters of ions, rather than an extended network.

AB - The bulk structure of the two oldest ionic liquids (ILs), ethylammonium nitrate (EAN) and ethanolammonium nitrate (EtAN), is elucidated using neutron diffraction. The spectra were modelled using empirical potential structure refinement (EPSR). The results demonstrate that EAN exhibits a long-range structure of solvophobic origin, similar to a bicontinuous microemulsion or disordered L3-sponge phase, but with a domain size of only 1 nm. The alcohol (-OH) moiety in EtAN interferes with solvophobic association between cation alkyl chains resulting in small clusters of ions, rather than an extended network.

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Amphiphilicity determines nanostructure in protic ionic liquids

Abstract

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