Nonlinear dielectric effect in solutions of m-nitrotoluene in saturated hydrocarbons

Śliwińska-Bartkowiak, Małgorzata; Szurkowski, B.; Hilczer, T.

doi:10.1016/0375-9601(81)90104-3

Cited by 14 publications

(7 citation statements)

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“…4(a)). Such an increase of the freezing temperature is consistent with recent dielectric relaxation measurements performed by Sliwinska-Bartkowiak and coworkers for a carbon tetrachloride/cyclohexane mixture confined in strongly attractive slit-pores of activated carbon fibers (Sliwinska-Bartkowiak et al, 2004). The authors also found a shift of the azeotrope point towards the higher CCl 4 concentration.…”

Section: Phase Diagram Of the Confined Mixturesupporting

confidence: 84%

Freezing of Mixtures Confined in a Slit Nanopore

Coasne

2005

Adsorption

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We report a Grand Canonical Monte Carlo study of the freezing/melting of Lennard-Jones A/B mixtures confined in a slit pore (H = 1.44 nm). The fluid/fluid interactions are chosen to model A = Ar and B = Kr. Fluid/wall interaction parameters are chosen so that the ratio of the wall/fluid to the fluid/fluid interactions for Kr and Ar is larger and smaller than 1, respectively. We find that the phase diagram of the confined mixture is of the same type than that for the bulk. The freezing temperature of confined mixtures rich in Kr is larger than the bulk. In contrast, we observe a decrease of the freezing temperature for mixtures rich in Ar. The confined crystal has a hexagonal structure (triangular symmetry), except for pure Ar where a square structure is observed.

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Section: Phase Diagram Of the Confined Mixturesupporting

confidence: 84%

Freezing of Mixtures Confined in a Slit Nanopore

Coasne

2005

Adsorption

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“…Coexistence curves of a nitrobenzene/n-hexane mixture in two different CPGs, compared with the bulk system. From [334].…”

Section: Low-porosity Materialsmentioning

confidence: 99%

Phase separation in confined systems

et al. 1999

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We review the current state of knowledge of phase separation and phase equilibria in porous materials. Our emphasis is on fundamental studies of simple fluids (composed of small, neutral molecules) and well-characterized materials. While theoretical and molecular simulation studies are stressed, we also survey experimental investigations that are fundamental in nature. Following a brief survey of the most useful theoretical and simulation methods, we describe the nature of gas-liquid (capillary condensation), layering, liquid-liquid and freezing/melting transitions. In each case studies for simple pore geometries, and also more complex ones where available, are discussed. While a reasonably good understanding is available for phase equilibria of pure adsorbates in simple pore geometries, there is a need to extend the models to more complex pore geometries that include effects of chemical and geometrical heterogeneity and connectivity. In addition, with the exception of liquid-liquid equilibria, little work has been done so far on phase separation for mixtures in porous media.

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“…Analysis of dielectric properties of these mixtures [3,7] revealed that in the concentration ranges distinguished by anomalous NDE increase, the system was found to be highly ordered and the energy of intermolecular interactions was observed to increase, similarly as it happens in the critical mixtures at the temperatures significantly higher than T,…”

Section: Introductionmentioning

confidence: 91%

“…The studies of nonlinear dielectric effect (NDE), that is the change of permittivity of a system in a strong electric field [1,2], as well as the results of dielectric constant measurements [3] carried out for o-nitrotoluene with some n-alkanes, proved that in a certain concentration range these mixtures show limited miscibility with a critical point. The critical concentrations x,/expressed as a molar fraction of the dipole liquid/of o-nitrotoluene mixtures with n-alkanes were found to satisfy the dependence [4]:…”

Section: Introductionmentioning

confidence: 99%

The Investigation of Near — Critical Mixtures by Means of the Nonlinear Dielectric Effect

Śliwińska-Bartkowiak

1990

Ber Bunsenges Phys Chem

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Nonlinear dielectric effect (NDE) occurring in classical critical mixtures of o‐nitrotoluene with alkanes as well as mixtures m‐nitrotoluene with alkanes showing a formally similar NDE course was studied. The magnitude of the measured effect in critical mixtures is proportional to where Φ ∼ 1/3. A similar dependence with the same exponent Φ was obtained for the other group of mixtures. — On the grounds of this analogy we conclude that a precritical effect occurs in the m‐nitrotoluene mixtures formally similar to the critical ones and we determine a hypothetical critical temperature for these mixtures.

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Nonlinear dielectric effect in solutions of m-nitrotoluene in saturated hydrocarbons

Cited by 14 publications

References 1 publication

Freezing of Mixtures Confined in a Slit Nanopore

Freezing of Mixtures Confined in a Slit Nanopore

Phase separation in confined systems

The Investigation of Near — Critical Mixtures by Means of the Nonlinear Dielectric Effect

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