Journal ArticleDOI
Phase equilibria in solutions of platelike particles: systems with steric and dispersive interactions between the platelets.
TLDR
Numerical calculations show that besides the isotropic- nematic biphasic coexistence range, inclusion of attractive forces resulted in the appearance of nematic-nematic coexistence in both, disks and rods, solutions.Abstract:
Our statistical thermodynamics model of solution of stiff, platelike, biaxial particles interacting solely via repulsion on contact (athermal limit) [Phys. Rev. E 62, 5011 (2000)] is extended to incorporate dispersion interactions between the particles. Dispersion forces between anisotropic particles are accounted for using the Imura-Okano approach. Numerical calculations specialized to solutions of either rods or disks show that besides the isotropic-nematic biphasic coexistence range, inclusion of attractive forces resulted in the appearance of nematic-nematic coexistence in both, disks and rods, solutions. The critical divergence of the difference between the order parameters and concentrations of the two nematics is observed while approaching the critical temperature. The minimum aspect ratio of rods or disks for the formation of the nematic phase is also discussed.read more
Citations
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Analysis of the degree of nematic ordering within dense aqueous dispersions of charged anisotropic colloids by 23Na NMR spectroscopy.
TL;DR: The degree of ordering within these clay nematic dispersions is probed by measuring the variation of the apparent (23)Na NMR relaxation rates as a function of the macroscopic orientation of the clay dispersion within the magnetic field.
Journal ArticleDOI
Polarizability of shelled particles of arbitrary shape in lossy media with an application to hematic cells.
TL;DR: It is shown that within the dipole approximation the complex polarizability of shelled particles of arbitrary shape can be written as the volume of the particle times a weighted average of the electric field in the particle, with weights determined by the differences in permittivities between the shells and the external, possibly lossy media.
References
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Journal ArticleDOI
Eine einfache molekular-statistische Theorie der nematischen kristallinflüssigen Phase. Teil II
Wilhelm Maier,Alfred Saupe +1 more
TL;DR: In this paper, the authors describe a mittlere Innere Feld einer nematischen Molekülanordnung abgeleitet, and gezeigt, daß this Innere Field in einem gewissen Temperaturbereich einen nematicalhen Ordnungszustand bewirken muß and daß dieser ordnung sustand was with einer bestimmten Temperatur diskontinuierlich und unter Energieaufnahme in die isot
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Critical Exponents for the N Vector Model in Three-Dimensions from Field Theory
J.C. Le Guillou,Jean Zinn-Justin +1 more
TL;DR: In this paper, the coefficients of the renormalization functions of the ( ϕ → 2 ) 2 theory are expanded in powers of the coupling constant, and new and more precise values of critical exponents are obtained.
Journal ArticleDOI
The Role of Attractive and Repulsive Forces in the Formation of Tactoids, Thixotropic Gels, Protein Crystals and Coacervates
TL;DR: In this paper, it was shown that the Coulomb attraction between the micelles and the oppositely charged ions in the solution gives an excess of attractive force which must be balanced by the dispersive action of thermal agitation and another repulsive force.
Journal ArticleDOI
Ordered phases of a liquid of biaxial particles
TL;DR: In this article, a simple model for an interacting liquid of particles lacking an axis of rotational symmetry is proposed, and the four order parameters necessary to describe an ordered phase are identified.