Tricriticality in the ternary system 3-methylpyridine/water/NaBr? The light-scattering intensity

Wagner, Monika; Stanga, Olimpiu; Schröer, Wolffram

doi:10.1039/b313564k

Cited by 44 publications

(36 citation statements)

References 38 publications

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“…Such experiments are rather difficult, because they require experiments of high precision and in a large temperature range. The necessary scattering experiments must include regions of high scattering intensity, where multiple scattering is present, as well regions with small scattering intensity, where other than critical fluctuations give substantial contributions to the scattering intensity, which, if ignored, may cause false interpretations [57,58]. The analysis of phase diagrams becomes complicated, because in the non-asymptotic regions the crossover corrections are in concurrence to non-universal specific properties.…”

Section: The Theoretical Model For Coulomb Fluidsmentioning

confidence: 97%

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A Short History of Phase Transitions in Ionic Fluids

Schröer

2012

Contrib. Plasma Phys.

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The paper reviews the development of theory and experiments concerning the nature of the critical point in ionic fluids. Because of the long-range nature of the Coulomb interactions the possibility of mean-field critical behaviour was discussed as a possibility. Although some experiments supported mean-field criticality, simulations on the model fluid of charged hard spheres and later experiments on ionic solutions have shown that phase transition of ionic systems belong to the Ising universality class like phase transitions in non-ionic fluids. Experiments concerning the crossover from Ising to mean field-behaviour are discussed as well as systematic differences between the phase behaviour predicted for the model fluid of charged hard spheres and that observed in ionic solutions.

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Section: The Theoretical Model For Coulomb Fluidsmentioning

confidence: 97%

“…Such long living mesoscopic structures shown in Fig. 7 become an interesting topic of research in its own right [57,58,98].…”

Section: Experiments Determining the Nature Of The Critical Pointmentioning

confidence: 99%

A Short History of Phase Transitions in Ionic Fluids

Schröer

2012

Contrib. Plasma Phys.

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“…Subsequent precise experiments by Schröer, Wiegand and others [25,26,27,28,29,30,31,32] showed that by careful identification and elimination of various additional effects (chemical instability, background scattering) Ising criticality is obtaind in all the systems for which MF criticality or tricriticalty, or a delayed crossover were reported previously. The authors of Ref.…”

Section: Introductionmentioning

confidence: 99%

Universality class of the critical point in the restricted primitive model of ionic systems

Ciach

2006

Phys. Rev. E

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A coarse-grained description of the restricted primitive model is considered in terms of the local charge-and number-density fields. Exact reduction to a one-field theory is derived, and exact expressions for the number-density correlation functions in terms of higher-order correlation functions for the charge-density are given. It is shown that in continuum space the singularity of the charge-density correlation function associated with short-wavelength charge-ordering disappears when charge-density fluctuations are included by following the Brazovskii approach. The related singularity of the individual Feynman diagrams contributing to the number-density correlation functions is cured when all the diagrams are segregated ito disjoint sets according to their topological structure. By performing a resummation of all diagrams belonging to each set a regular expression represented by a secondary diagram is obtained. The secondary diagrams are again segregated into disjoint sets, and the series of all the secondary diagrams belonging to a given set is represented by a hyperdiagram. A one-to-one correspondence between the hyperdiagrams contributing to the number-density vertex functions, and diagrams contributing to the order-parameter vertex functions in a certain model system belonging to the Ising universality class is demonstrated.Corrections to scaling associated with irrelevant operators that are present in the model-system Hamiltonian, and other corrections specific to the RPM are also discussed.

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“…This binary mixture is completely miscible at room temperature and separates into two phases with increasing temperature at 310.3 K. With the addition of salt ions, it has been reported that the critical temperature decreases (Narayanan & Kumar, 1994) due to the creation of nano-sized microclusters in the one-phase region (Jacob et al, 1999). On the other hand, several authors have investigated the critical phenomena of a water/3MP/NaBr system by means of light scattering (Jacob et al, 1998;Anisimov et al, 2000;Wagner et al, 2004;Hernandez et al, 2003;Kostko et al, 2004;Unni, 2006). Jacob et al showed that critical behaviors can be expressed by crossover from the three-dimensional Ising behavior to the mean-field behavior and concluded that an additional length scale exists competing with the correlation length of the concentration fluctuation.…”

Section: Introductionmentioning

confidence: 99%

Mesoscopic structure in near-critical mixtures of D₂O and 3-methylpyridine with salts

et al. 2007

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Small‐angle neutron scattering (SANS) experiments were performed on mixtures of 3‐methylpyridine, D2O, and salts to investigate concentration fluctuations and structures in the vicinity of the critical point. The SANS profiles of ternary mixtures with large critical temperature shifts can be analyzed by the sum of the concentration fluctuation and a scattering from spherical clusters. The size of the clusters increases as the critical point is approached. These results can be interpreted in terms of a strong coupling of the critical fluctuation and the solvation effect of salt ions.

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Tricriticality in the ternary system 3-methylpyridine/water/NaBr? The light-scattering intensity

Cited by 44 publications

References 38 publications

A Short History of Phase Transitions in Ionic Fluids

A Short History of Phase Transitions in Ionic Fluids

Universality class of the critical point in the restricted primitive model of ionic systems

Mesoscopic structure in near-critical mixtures of D₂O and 3-methylpyridine with salts

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Tricriticality in the ternary system 3-methylpyridine/water/NaBr? The light-scattering intensity

Cited by 44 publications

References 38 publications

A Short History of Phase Transitions in Ionic Fluids

A Short History of Phase Transitions in Ionic Fluids

Universality class of the critical point in the restricted primitive model of ionic systems

Mesoscopic structure in near-critical mixtures of D2O and 3-methylpyridine with salts

Contact Info

Product

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Mesoscopic structure in near-critical mixtures of D₂O and 3-methylpyridine with salts