Condensed Matter Theory

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Nonmonotonic variation with salt concentration of the second virial coefficient in protein solutions

Physical Review E Statistical Nonlinear and Soft Matter Physics 67:5 1 (2003) 051404/13

Authors:

E Allahyarov, H Löwen, JP Hansen, AA Louis

Abstract:

The effective interactions and the second osmotic virial coefficient B2 of protein solutions incorporating the electrostatics within the "primitive" model of electrolytes was calculated. For discrete charge distributions, the interactions and related B2 vary in a nonmonotonic fashion with increasing ionic strength, while for the smeared charge model, a standard workhorse of colloidal physics, this effect was absent. These correlated-induced effects were missed within nonlinear PB theory, and similar coarse-graining techniques taken from the theory of colloids.

Hydrodynamics of domain growth in nematic liquid crystals.

Phys Rev E Stat Nonlin Soft Matter Phys 67:5 Pt 1 (2003) 051705

Authors:

Géza Tóth, Colin Denniston, JM Yeomans

Abstract:

We study the growth of aligned domains in nematic liquid crystals. Results are obtained solving the Beris-Edwards equations of motion using the lattice Boltzmann approach. Spatial anisotropy in the domain growth is shown to be a consequence of the flow induced by the changing order parameter field (backflow). The generalization of the results to the growth of a cylindrical domain, which involves the dynamics of a defect ring, is discussed.
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Jammed systems in slow flow need a new statistical mechanics

Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences The Royal Society 361:1805 (2003) 741-751

Authors:

Jasna Brujic, Sam F Edwards, Dmitri Grinev
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Dynamical Structure Factor in Cu Benzoate and other spin-1/2 antiferromagnetic chains

(2003)

Authors:

FHL Essler, A Furusaki, T Hikihara
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Influence of solvent quality on effective pair potentials between polymers in solution

Physical Review E Statistical Nonlinear and Soft Matter Physics 67:4 1 (2003) 418011-4180114

Authors:

V Krakoviack, JP Hansen, AA Louis

Abstract:

The effect of solvent quality on the effective pair potentials of the interacting linear polymers of a solution was investigated. The inversion of c.m. pair distribution function, by using the hypernetted chain closure method, was employed for the derivation of effective pair potentials. The pair potential was found to be strongly dependent on the polymer concentration and temperature.