2010
DOI: 10.1063/1.3398029
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Ionic multilayers at the free surface of an ionic liquid, trioctylmethylammonium bis(nonafluorobutanesulfonyl)amide, probed by x-ray reflectivity measurements

Abstract: The presence of ionic multilayers at the free surface of an ionic liquid, trioctylmethylammonium bis(nonafluorobutanesulfonyl)amide ([TOMA(+)][C(4)C(4)N(-)]), extending into the bulk from the surface to the depth of approximately 60 A has been probed by x-ray reflectivity measurements. The reflectivity versus momentum transfer (Q) plot shows a broad peak at Q approximately 0.4 A(-1), implying the presence of ionic layers at the [TOMA(+)][C(4)C(4)N(-)] surface. The analysis using model fittings revealed that at… Show more

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Cited by 77 publications
(133 citation statements)
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References 77 publications
(120 reference statements)
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“…IL surface properties have been investigated by numerous surface-sensitive spectroscopic techniques and scattering methods. Initially, these studies were mainly restricted to methods that can be applied under ambient conditions, such as sum-frequency generation (SFG) [100,[109][110][111][112][113][114][115][116], X-ray reflectivity and neutron reflectometry [112,[117][118][119][120][121], grazing incidence X-ray diffraction [122], atomic force microscopy (AFM) [104,[123][124][125][126][127][128][129][130][131][132][133][134] and surface force balance (SFB) [135][136][137]. In 2005, it was realized that the surface properties of ILs can also be investigated using the well-developed techniques of ''classical'' surface science.…”
Section: Molecular Insights Into Il/gas and Il/support Interfacesmentioning
confidence: 99%
“…IL surface properties have been investigated by numerous surface-sensitive spectroscopic techniques and scattering methods. Initially, these studies were mainly restricted to methods that can be applied under ambient conditions, such as sum-frequency generation (SFG) [100,[109][110][111][112][113][114][115][116], X-ray reflectivity and neutron reflectometry [112,[117][118][119][120][121], grazing incidence X-ray diffraction [122], atomic force microscopy (AFM) [104,[123][124][125][126][127][128][129][130][131][132][133][134] and surface force balance (SFB) [135][136][137]. In 2005, it was realized that the surface properties of ILs can also be investigated using the well-developed techniques of ''classical'' surface science.…”
Section: Molecular Insights Into Il/gas and Il/support Interfacesmentioning
confidence: 99%
“…In contrast to the progress of the understanding of the EDL of ILs from the theoretical side, experimental confirmation of the predicted IL-peculiar behavior is not straightforward. It has been found, from studies using electrochemical impedance spectroscopy (EIS), that C for the EDL of ILs has strong frequency dependence [11][12][13][14][15][16][17][18] and shows potential hysteresis, 11,[19][20][21] both of which seem to result from the structural ordering of IL interface [22][23][24][25][26][27][28][29] and the ultraslow dynamics [29][30][31][32][33][34][35][36][37][38] of such ordered structure. These tendencies have hampered rigorous evaluation of C experimentally.…”
Section: Introductionmentioning
confidence: 99%
“…The first strategy focused on either elongation or shortening of the perfluoroalkyl chains in the anion. Thus, from 2000 onwards, the family of TFSI anions was replenished with new members: the bis(fluorosulfonyl)imide (FSI) anion, 4 which can be considered as a short version of TFSI, and bis[(pentafluoroethyl)sulfonyl]imide (BETI) 5 and bis[(nonafluorobutyl)-sulfonyl]imide (C 4 C 4 ) anions 6 which are long versions of TFSI.…”
Section: Introductionmentioning
confidence: 99%