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Interfacial structuring of non-halogenated imidazolium ionic liquids at charged surfaces : effect of alkyl chain length

(2020) PHYSICAL CHEMISTRY CHEMICAL PHYSICS. 22(16). p.8450-8460
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Abstract
Control of the interfacial structures of ionic liquids (ILs) at charged interfaces is important to many of their applications, including in energy storage solutions, sensors and advanced lubrication technologies utilising electric fields. In the case of the latter, there is an increasing demand for the study of non-halogenated ILs, as many fluorinated anions have been found to produce corrosive and toxic halides under tribological conditions. Here, the interfacial structuring of a series of four imidazolium ILs ([C(n)C(1)Im]) of varying alkyl chain lengths (n = 5, 6, 7, 10), with a non-halogenated borate-based anion ([BOB]), have been studied at charged interfaces using sum frequency generation (SFG) spectroscopy and neutron reflectivity (NR). For all alkyl chain lengths, the SFG spectra show that the cation imidazolium ring responds to the surface charge by modifying its orientation with respect to the surface normal. In addition, the combination of SFG spectra with electrochemical NR measurements reveals that the longest alkyl chain length (n = 10) forms a bilayer structure at all charged interfaces, independent of the ring orientation. These results demonstrate the tunability of IL interfacial layers through the use of surface charge, as well as effect of the cation alkyl chain length, and provide valuable insight into the charge compensation mechanisms of ILs.
Keywords
CH STRETCHING VIBRATIONS, ELECTRICAL DOUBLE-LAYER, FRICTIONAL-PROPERTIES, MOLECULAR-ORIENTATION, WATER MIXTURES, MOLTEN-SALTS, GENERATION, SPECTROSCOPY, LUBRICATION, MONOLAYERS

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MLA
Watanabe, Seiya, et al. “Interfacial Structuring of Non-Halogenated Imidazolium Ionic Liquids at Charged Surfaces : Effect of Alkyl Chain Length.” PHYSICAL CHEMISTRY CHEMICAL PHYSICS, vol. 22, no. 16, 2020, pp. 8450–60, doi:10.1039/d0cp00360c.
APA
Watanabe, S., Pilkington, G. A., Oleshkevych, A., Pedraz, P., Radiom, M., Welbourn, R., … Rutland, M. W. (2020). Interfacial structuring of non-halogenated imidazolium ionic liquids at charged surfaces : effect of alkyl chain length. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 22(16), 8450–8460. https://doi.org/10.1039/d0cp00360c
Chicago author-date
Watanabe, Seiya, Georgia A. Pilkington, Anna Oleshkevych, Patricia Pedraz, Milad Radiom, Rebecca Welbourn, Sergei Glavatskih, and Mark W. Rutland. 2020. “Interfacial Structuring of Non-Halogenated Imidazolium Ionic Liquids at Charged Surfaces : Effect of Alkyl Chain Length.” PHYSICAL CHEMISTRY CHEMICAL PHYSICS 22 (16): 8450–60. https://doi.org/10.1039/d0cp00360c.
Chicago author-date (all authors)
Watanabe, Seiya, Georgia A. Pilkington, Anna Oleshkevych, Patricia Pedraz, Milad Radiom, Rebecca Welbourn, Sergei Glavatskih, and Mark W. Rutland. 2020. “Interfacial Structuring of Non-Halogenated Imidazolium Ionic Liquids at Charged Surfaces : Effect of Alkyl Chain Length.” PHYSICAL CHEMISTRY CHEMICAL PHYSICS 22 (16): 8450–8460. doi:10.1039/d0cp00360c.
Vancouver
1.
Watanabe S, Pilkington GA, Oleshkevych A, Pedraz P, Radiom M, Welbourn R, et al. Interfacial structuring of non-halogenated imidazolium ionic liquids at charged surfaces : effect of alkyl chain length. PHYSICAL CHEMISTRY CHEMICAL PHYSICS. 2020;22(16):8450–60.
IEEE
[1]
S. Watanabe et al., “Interfacial structuring of non-halogenated imidazolium ionic liquids at charged surfaces : effect of alkyl chain length,” PHYSICAL CHEMISTRY CHEMICAL PHYSICS, vol. 22, no. 16, pp. 8450–8460, 2020.
@article{8691164,
  abstract     = {{Control of the interfacial structures of ionic liquids (ILs) at charged interfaces is important to many of their applications, including in energy storage solutions, sensors and advanced lubrication technologies utilising electric fields. In the case of the latter, there is an increasing demand for the study of non-halogenated ILs, as many fluorinated anions have been found to produce corrosive and toxic halides under tribological conditions. Here, the interfacial structuring of a series of four imidazolium ILs ([C(n)C(1)Im]) of varying alkyl chain lengths (n = 5, 6, 7, 10), with a non-halogenated borate-based anion ([BOB]), have been studied at charged interfaces using sum frequency generation (SFG) spectroscopy and neutron reflectivity (NR). For all alkyl chain lengths, the SFG spectra show that the cation imidazolium ring responds to the surface charge by modifying its orientation with respect to the surface normal. In addition, the combination of SFG spectra with electrochemical NR measurements reveals that the longest alkyl chain length (n = 10) forms a bilayer structure at all charged interfaces, independent of the ring orientation. These results demonstrate the tunability of IL interfacial layers through the use of surface charge, as well as effect of the cation alkyl chain length, and provide valuable insight into the charge compensation mechanisms of ILs.}},
  author       = {{Watanabe, Seiya and Pilkington, Georgia A. and Oleshkevych, Anna and Pedraz, Patricia and Radiom, Milad and Welbourn, Rebecca and Glavatskih, Sergei and Rutland, Mark W.}},
  issn         = {{1463-9076}},
  journal      = {{PHYSICAL CHEMISTRY CHEMICAL PHYSICS}},
  keywords     = {{CH STRETCHING VIBRATIONS,ELECTRICAL DOUBLE-LAYER,FRICTIONAL-PROPERTIES,MOLECULAR-ORIENTATION,WATER MIXTURES,MOLTEN-SALTS,GENERATION,SPECTROSCOPY,LUBRICATION,MONOLAYERS}},
  language     = {{eng}},
  number       = {{16}},
  pages        = {{8450--8460}},
  title        = {{Interfacial structuring of non-halogenated imidazolium ionic liquids at charged surfaces : effect of alkyl chain length}},
  url          = {{http://doi.org/10.1039/d0cp00360c}},
  volume       = {{22}},
  year         = {{2020}},
}

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