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Emerging dynamics in surfactant-based liquid mixtures: Octanoic acid/bis(2-ethylhexyl) amine systems
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10.1063/1.3684713
/content/aip/journal/jcp/136/6/10.1063/1.3684713
http://aip.metastore.ingenta.com/content/aip/journal/jcp/136/6/10.1063/1.3684713

Figures

Image of Scheme 1.
Scheme 1.

Schematic representation of n-octanoic acid (OA) and bis(2-ethylhexyl)amine (BEEA) molecular structures.

Image of FIG. 1.
FIG. 1.

Density (upper panel) and refractive index at 546.1 nm (lower panel) of OA/BEEA system at 298 K as a function of volume fraction (ϕ OA).

Image of FIG. 2.
FIG. 2.

Experimental number density values (ρ N ) as a function of XOA. The inset shows the excess molar volumes.

Image of FIG. 3.
FIG. 3.

Molar refraction (R) of OA/BEEA system as a function of the OA molar fraction (XOA). The inset shows the excess molar refraction (ΔR) as a function of XOA.

Image of FIG. 4.
FIG. 4.

Real (ɛ ) and imaginary (ɛ ) parts of dielectric spectrum of the mix at XOA = 0.35 (circles). Continuous lines are the overall fitting curves and the dashed ones are the single contributions.

Image of FIG. 5.
FIG. 5.

Anti-Stokes side of the Brillouin spectrum for selected samples obtained at 25 °C. Solid lines are the fit results using Eq. (4). In the inset the full spectrum (Stokes and anti-Stokes sides) for a mixture (XOA = 0.67).

Image of FIG. 6.
FIG. 6.

Normalized absorption, a/f 2, and hypersonic velocity as functions of temperature of some representative samples.

Image of FIG. 7.
FIG. 7.

Relaxation time at 25 °C as a function of XOA.

Image of FIG. 8.
FIG. 8.

Correlation between the relaxation times (found by both dielectric spectroscopy and Brillouin scattering) and the conductivity. For each point, the corresponding XOA value is shown as a label. Linear least squares fit to the data gives exponents (a) of 9 ± 1 for Brillouin data and (b) 4.2 ± 0.9 for dielectric ones.

Tables

Generic image for table
Table I.

Optimised fitting parameters derived from the analysis of dielectric data for all the samples.

Generic image for table
Table II.

Fitting parameters through the Cole-Cole model and Eq. (9) for the whole set of experimental data.

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/content/aip/journal/jcp/136/6/10.1063/1.3684713
2012-02-14
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Emerging dynamics in surfactant-based liquid mixtures: Octanoic acid/bis(2-ethylhexyl) amine systems
http://aip.metastore.ingenta.com/content/aip/journal/jcp/136/6/10.1063/1.3684713
10.1063/1.3684713
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