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Ionic multilayers at the free surface of an ionic liquid, trioctylmethylammonium bis(nonafluorobutanesulfonyl)amide, probed by x-ray reflectivity measurements
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10.1063/1.3398029
/content/aip/journal/jcp/132/16/10.1063/1.3398029
http://aip.metastore.ingenta.com/content/aip/journal/jcp/132/16/10.1063/1.3398029

Figures

Image of Scheme 1.
Scheme 1.

Structure of .

Image of FIG. 1.
FIG. 1.

Scheme of the experimental apparatus for the x-ray reflectivity measurements.

Image of FIG. 2.
FIG. 2.

(a) Plot of x-ray reflectivity vs momentum transfer with error bars of one standard deviation. The solid curve is the calculated Fresnel reflectivity for ideally flat and structureless surface [ and in Eq. (1)], and the dotted curve is the reflectivity for thermally fluctuated but structureless surface [ and is from Eq. (3)]. (b) vs plot. The solid curves are from the model fittings for the DC and LC models (red and blue, respectively) to the experimental plots (open circles).

Image of FIG. 3.
FIG. 3.

Intrinsic electron density profiles at the surface of using parameters obtained from the fitting of the DC and LC models (red and blue, respectively) listed in Tables I and II. Gaussian profiles (black dotted lines) correspond to the electron density of ion layers in the DC model. The profile from the LC model is shifted by to ease the comparison of the two models.

Image of FIG. 4.
FIG. 4.

Simplified schematics of the ionic multilayers at the surface. (a) Ionic layers without segregation of cations and anions between layers, (b) and (c) Ionic layers alternately composed of cations and anions. is the distance of the repetition depth of the layering structure to show a reflectivity peak at .

Tables

Generic image for table
Table III.

The ILs used for NR and XR measurements, the diameters of the cations and anions constituting the ILs, and critical temperatures of the ILs.

Generic image for table
Table I.

Parameters obtained by fitting the curve from the DC model to XR data.

Generic image for table
Table II.

Parameters obtained by fitting the curve from the LC model curve to XR data.

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/content/aip/journal/jcp/132/16/10.1063/1.3398029
2010-04-30
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ionic multilayers at the free surface of an ionic liquid, trioctylmethylammonium bis(nonafluorobutanesulfonyl)amide, probed by x-ray reflectivity measurements
http://aip.metastore.ingenta.com/content/aip/journal/jcp/132/16/10.1063/1.3398029
10.1063/1.3398029
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