ar X iv : c on d - m at / 0 31 14 64 v 2 [ co nd - m at . s of t ] 1 4 Fe b 20 04 Dynamics of nematic elastomers

ar X iv : c on d - m at / 0 31 14 64 v 1 [ co nd - m at . s of t ] 1 9 N ov 2 00 3 Dynamics of nematic elastomers

We study the low-frequency, long-wavelength dynamics of soft and semi-soft nematic elastomers using two different but related dynamic theories. Our first formulation describes the pure hydrodynamic behavior of nematic elastomers in which the nematic director has relaxed to its equilibrium value in the presence of strain. We find that the sound-modes structure is identical to that of columnar li...

ar X iv : c on d - m at / 0 20 22 62 v 2 [ co nd - m at . s of t ] 1 9 Fe b 20 02 Phase Transitions in Lyotropic Nematic Gels

In this paper, we discuss the equilibrium phases and collapse transitions of a lyotropic nematic gel immersed in an isotropic solvent. A nematic gel consists of a cross-linked polymer network with rod-like molecules embedded in it. Upon decreasing the quality of the solvent, we find that a lyotropic nematic gel undergoes a discontinuous volume change accompanied by an isotropic-nematic transiti...

ar X iv : c on d - m at / 0 40 25 85 v 1 [ co nd - m at . s of t ] 2 4 Fe b 20 04 1 Entropy Driven Phase Separation

A grand canonical Monte Carlo method for the simulation of a simple colloid-polymer mixture called the AO model will be described. The phase separation known to occur in this model is driven by entropy. The phase diagram of the unmixing transition, the surface tension and the critical point will be determined.

ar X iv : c on d - m at / 0 20 91 97 v 1 [ co nd - m at . s up r - co n ] 9 S ep 2 00 2 Oxygen Phonon Branches

ar X iv : c on d - m at / 0 20 24 28 v 1 [ co nd - m at . s of t ] 2 5 Fe b 20 02 Charge Fluctuations and Counterion Condensation

We predict a condensation phenomenon in an overall neutral system, consisting of a single charged plate and its oppositely charged counterions. Based on the " two-fluid " model, in which the counterions are divided into a " free " and a " condensed " fraction, we argue that for high surface charge, fluctuations can lead to a phase transition in which a large fraction of counterions is condensed...