Ionic conduction in binary mixtures of dipolar liquids

Choudhary, Shobhna; Sengwa, R. J.

doi:10.1016/j.molliq.2012.08.011

Cited by 12 publications

(3 citation statements)

References 32 publications

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“…Owing to the low electrical conductivity of octanoic acid, the behavior of SO/octanoic acid mixtures appears to be linear over the whole composition range, which tangentially matches the low concentration SO/octanol data. Characteristic data such as that shown in Figure 7b have been reported previously by Choudhary and Sengwa [66] for mixtures of higher electrical conductivity polar liquids. Straight lines drawn between the respective electrical conductivities of the components (i.e., from x 1 = 0 to x 1 = 1) plotted on a logarithmic scale represent "ideal mixing", in which intermolecular interactions are weak over the whole composition range, although no explanation was given for why the dependence should be logarithmic [66].…”

Section: Dielectric and Electrical Conductivity Behavior Of N-dodecane/1-octanol Mixturessupporting

confidence: 81%

“…Characteristic data such as that shown in Figure 7b have been reported previously by Choudhary and Sengwa [66] for mixtures of higher electrical conductivity polar liquids. Straight lines drawn between the respective electrical conductivities of the components (i.e., from x 1 = 0 to x 1 = 1) plotted on a logarithmic scale represent "ideal mixing", in which intermolecular interactions are weak over the whole composition range, although no explanation was given for why the dependence should be logarithmic [66]. At the present time, we are also unable to provide a theoretical justification of this treatment.…”

Section: Dielectric and Electrical Conductivity Behavior Of N-dodecane/1-octanol Mixturessupporting

confidence: 81%

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Electrical Conductivity and Viscosity in Binary Organic Liquid Mixtures: Participation of Molecular Interactions and Nanodomains

Taylor

Zeng

2020

Colloids and Interfaces

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The present work aims to shed light on recent literature reports suggesting that ionic species are implicated in the electrical conductivity of 1-octanol and its mixtures with hydrocarbons. Other workers have questioned this interpretation, and herein, based on new experimentation and with reference to various literature studies, we consider that molecular interactions are more likely to be responsible. To investigate this, we have studied mixtures of 1-octanol and either silicone oil (SO) or n-dodecane as nonpolar components, using dielectric (in particular electrical conductivity) and viscometric measurements. With reference to the literature, the self-association of alcohols is known to create microheterogeneity in the neat liquids and in mixtures with nonpolar, low dielectric constant liquids, and it has previously been considered to be responsible for the particular solvent properties of alcohols. The present results suggest that the electrical conductivity of alkane/alcohol systems may have similar origins, with percolating pathways formed from octanol-rich nanodomains comprising polar regions containing hydrogen-bonded hydroxyl groups and nonpolar regions dominated by alkyl chains. The percolation threshold found for dodecane/octanol mixtures, in which interactions between the component molecules are found from viscosity measurements to be repulsive, agrees well with results from experimental and theoretical studies of disordered arrangements of packed spheres, and moreover, it is consistent with other published alkane/alcohol results. On the other hand, the situation is more complex for SO/octanol mixtures, in which interactions between the two components are attractive, based on viscosity data, and in which the phase separation of SO occurs at high octanol concentrations. Overall, we have concluded that electrical conductivity in octanol (and potentially all liquid alcohols) and its mixtures with nonpolar molecules, such as alkanes, is consistent with the presence of conducting networks comprising octanol-rich nanodomains formed by self-association, and not as a result of ionic conduction.

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Section: Dielectric and Electrical Conductivity Behavior Of N-dodecane/1-octanol Mixturessupporting

confidence: 81%

Section: Dielectric and Electrical Conductivity Behavior Of N-dodecane/1-octanol Mixturessupporting

confidence: 81%

Electrical Conductivity and Viscosity in Binary Organic Liquid Mixtures: Participation of Molecular Interactions and Nanodomains

Taylor

Zeng

2020

Colloids and Interfaces

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“…In the static permittivity frequency regime, PEGs and other dipolar liquids commonly exhibit ionic conductivity and electric double layers (EDLs) relaxation processes [16][17][18][19][20], and their characteristics are similar to that of the liquid polymeric electrolytes [21]. All the neat dipolar liquids possess 'natural' unidentified free ions contaminants, which are further activated by the assistance of some natural electromagnetic irradiations [19,[22][23][24]. The ionic characterization (dc conductivity and ions dynamics) in liquid electrolytes and also in solid electrolytes is mostly examined by their low-frequency dielectric and impedance measurements [8,11,21,25,26].…”

Section: Introductionmentioning

confidence: 99%