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Free volume in imidazolium triflimide ionic liquid from positron lifetime: Amorphous, crystalline, and liquid states
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10.1063/1.3487522
/content/aip/journal/jcp/133/12/10.1063/1.3487522
http://aip.metastore.ingenta.com/content/aip/journal/jcp/133/12/10.1063/1.3487522
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

The mean and standard deviation of the lifetime distribution for . The lines through the data points are a visual aid; the arrows show the glass transition, the crystallization, the melting and the knee temperature of the sample. Filled symbols: decreasing ; empty symbols: increasing .

Image of FIG. 2.
FIG. 2.

Hole radius distribution of for four selected temperatures: 160 and 185 K (glass), 220 K (supercooled liquid), and 265 K (liquid). The distributions are normalized to the unity area below the curve. Vertical lines show the effective radius of ions (dotted) and (dashed).

Image of FIG. 3.
FIG. 3.

Hole volume distribution from PALS (line) and from the complex-hole theory of Fürth (Ref. 3) (line with dots) for at 265 K. gives the fractional number of holes of sizes between and and has been here normalized to . The surface tension in Fürth’s theory was chosen to in order to get the best agreement of Fürth’s distribution with the experimental curve from PALS. The value denotes the number of individual holes in a complex hole of Fürth’s theory.

Image of FIG. 4.
FIG. 4.

The same as for Fig. 1, except for the mean and standard deviation of the hole size distribution (squares and circles). is the specific volume at zero pressure from PVT experiments (stars) and its extrapolation to low temperatures is shown by a dashed-dotted line. The rhomb symbols show the mean hole size calculated from Fürth’s complex-hole theory (Ref. 3). For clarity, we have omitted the error flags.

Image of FIG. 5.
FIG. 5.

Plot of the specific volume of calculated from the fit in Fig. 3 vs the mean hole volume for the temperature range above . The line is a linear fit to the data of the supercooled liquid in the temperature range between 185 K and 265 K (filled symbols).

Image of FIG. 6.
FIG. 6.

The same as for Fig. 1, but the intensity .

Image of FIG. 7.
FIG. 7.

The same as for Fig. 1, but the mean lifetime and standard deviation of the lifetime distribution.

Image of FIG. 8.
FIG. 8.

Arrhenius plot (squares: bottom -axis and left -axis) and Cohen–Turnbull plot (circles: top -axis and right -axis) of the value , where is the viscosity and the absolute temperature for . The lines are VFT and Cohen–Turnbull (CT) fits to the data in the temperature range between 253.3 and 353.3 K.

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/content/aip/journal/jcp/133/12/10.1063/1.3487522
2010-09-24
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Free volume in imidazolium triflimide ([C3MIM][NTf2]) ionic liquid from positron lifetime: Amorphous, crystalline, and liquid states
http://aip.metastore.ingenta.com/content/aip/journal/jcp/133/12/10.1063/1.3487522
10.1063/1.3487522
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