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Hammadi, A.; Champeney, D. C.

doi:10.1023/a:1021747223332

Cited by 7 publications

(8 citation statements)

References 17 publications

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“…Up to x = 10 %, a nearly parallel upward displacement of this curve with increasing ion content is observed (see also the pluses in the inset). Similar behavior was also noticed for NaClglycerol solutions [27]. It may be ascribed to the increasingly important role of interactions between glycerol molecules and ions, which reduce reorientational mobility [23].…”

Section: Licl In Glycerolsupporting

confidence: 76%

“…To investigate this notion in more detail, in the present work, we provide dielectric measurements on the prototypical dipolar glass-former glycerol containing varying amounts of LiCl. In the past, various dielectric investigations of solutions of ionic salts in dipolar glass formers were reported (see, e.g., [21,22,23,24,25,26,27]). Many of these works have appeared already rather long ago and are relatively restricted concerning frequency and temperature range and partly treat a limited range of ion concentrations only.…”

Section: Introductionmentioning

confidence: 99%

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Dielectric and conductivity relaxation in mixtures of glycerol with LiCl

2008

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We report a thorough dielectric characterization of the alpha relaxation of glass-forming glycerol with varying additions of LiCl. Nine salt concentrations from 0.1 to 20mol% are investigated in a frequency range of 20Hz-3GHz and analyzed in the dielectric loss and modulus representation. Information on the dc conductivity, the dielectric relaxation time (from the loss) and the conductivity relaxation time (from the modulus) is provided. Overall, with increasing ion concentration, a transition from reorientationally to translationally dominated behavior is observed and the translational ion dynamics and the dipolar reorientational dynamics become successively coupled. This gives rise to the prospect that, by adding ions to dipolar glass formers, dielectric spectroscopy may directly couple to the translational degrees of freedom determining the glass transition, even in frequency regimes where usually strong decoupling is observed.

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Section: Licl In Glycerolsupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Dielectric and conductivity relaxation in mixtures of glycerol with LiCl

2008

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“…5 For NMF t s exhibits large changes, possibly reflecting a breakdown of the hydrogen-bonded solvent chains. The dynamics of FA, as well as of water 41,[283][284][285]295 and glycerol 296 are only moderately affected by dissolved inorganic electrolytes. Depending on the salt t s may decrease or increase.…”

Section: Electrolyte Solutionsmentioning

confidence: 97%

9 Dielectric relaxation in solutions

Buchner

Barthel

2001

Annu. Rep. Prog. Chem., Sect. C

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“…However, there was a lack of conductance data on electrolytes in glycerol at temperatures other than 25 °C; therefore, it seemed very interesting to provide data for such a highly viscous solvent over as large a temperature range as possible. In a previous paper, the ionic mobility in glass-forming mixtures of sodium chloride and glycerol was studied. Experiments resulted in the conclusion that the ion mobility displays a very smooth and regular variation with temperature, and there seems at first inspection to be no evidence for a change in the character of ion motion between the low- and high-viscosity regions.…”

Section: Introductionmentioning

confidence: 99%

Conductance of Solutions of Alkali-Metal Halides in Glycerol

Hammadi

Champeney

2000

J. Chem. Eng. Data

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The electrical conductivities of solutions of salts (KCl, NaCl, KBr, NaBr, NaI, KI, and LiBr) in glycerol have been measured at three concentrations (approximately 0.01, 0.1, and 0.3 M) at 25 °C and at other temperatures from (3.37 to 42.24) °C in the case of KCl and NaCl. Values of the molar conductivity at infinite dilution were obtained by extrapolation using the conductance equation of Onsager. Using previously measured transference numbers for KCl and NaCl in glycerol, values of limiting Walden products for the individual alkali-metal and halide ions in glycerol have been derived and compared with those in aqueous and other alcohol solutions. The values for glycerol were the largest so far measured. The limiting ion conductivities, λ ∞ , obtained from experimental data were compared with those calculated applying the Boyd-Zwanzig theory. A modified Walden rule, Λ ∞ η p ) constant, is suggested as applicable in glycerol, the exponent p being less than unity and having a value down to 0.9. Finally, the temperature dependence of the Walden product for NaCl-and KCl-glycerol solutions is discussed.

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Cited by 7 publications

References 17 publications

Dielectric and conductivity relaxation in mixtures of glycerol with LiCl

Dielectric and conductivity relaxation in mixtures of glycerol with LiCl

9 Dielectric relaxation in solutions

Conductance of Solutions of Alkali-Metal Halides in Glycerol

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