@article {5028,
	title = {Coexistence and criticality of fluids with long-range potentials},
	journal = {Journal of Chemical Physics},
	volume = {114},
	number = {1},
	year = {2001},
	note = {ISI Document Delivery No.: 388LUTimes Cited: 35Cited Reference Count: 44},
	month = {Jan},
	pages = {399-408},
	type = {Article},
	abstract = {Using mixed-field finite-size scaling simulations, we have investigated the liquid-vapor critical behavior of three-dimensional fluids;vith algebraically decaying attractive pair interactions, which vary like -1/r(3+sigma) with sigma = 3, 1, and 0.1. The finite-size scaling analysis was carried out by matching the critical ordering operator distribution, p(L)(x), against the limiting Ising form, i.e., Ising criticality was assumed. When the potential is short-ranged (sigma = 3) the simulation results are entirely consistent with the expected Ising critical behavior. When the potential is long-ranged (sigma = 1, 0.1), however, marked deviations from Ising behavior are observed, particularly in the form of the critical ordering operator distribution, and in the estimated values of beta/nu. The results are consistent with non-Ising criticality which is predicted theoretically in fluid with long-range interactions. Some results from Gibbs ensemble simulations are also provided in order to sketch the shape of the liquid-vapor coexistence envelope. We discuss the relevance of our results to the current issue of criticality in ionic fluids. (C) 2001 American Institute of Physics.},
	keywords = {CRITICAL EXPONENTS, CRITICAL-BEHAVIOR, CRITICAL-POINT, CURVE DIAMETER, GIBBS ENSEMBLE, IONIC BINARY MIXTURE, LENNARD-JONES FLUID, MONTE-CARLO, PHASE-TRANSITIONS, RESTRICTED PRIMITIVE MODEL},
	isbn = {0021-9606},
	url = {<Go to ISI>://000166182900046},
	author = {Camp, P. J. and Patey, G. N.}
}
@article {4198,
	title = {Gas-liquid coexistence and demixing in systems with highly directional pair potentials},
	journal = {Physical Review E},
	volume = {57},
	number = {5},
	year = {1998},
	note = {ISI Document Delivery No.: ZP583Times Cited: 19Cited Reference Count: 21Part B},
	month = {May},
	pages = {5682-5686},
	type = {Article},
	abstract = {Recent computer simulation studies strongly indicate that fluids of dipolar hard spheres do not display gas-isotropic liquid coexistence. In this paper we discuss a second example that also exhibits this rather unexpected behavior. This is a simple liquid-crystal model that we explore employing Gibbs ensemble Monte Carlo (GEMC) methods. It is shown that the system has clear gas-nematic liquid coexistence, but that the gas-isotropic liquid coexistence line is completely missing from the phase diagram. We attribute this to the highly directional nature of the attractive potential and argue that similar considerations are likely of relevance in the dipolar hard-sphere case as well. We also use GEMC techniques to investigate demixing in binary mixtures of neutral and dipolar hard spheres. For similar mixtures of neutral and charged have spheres, it is known that demixing is essentially condensation of the Coulombic fluid weakly influenced by the background of neutral hard spheres. Therefore, given that dipolar hard spheres do not condense, whether or not the present mixtures demix is an interesting question. In fact, demi?ring is observed and, moreover, the transition temperatures are in reasonable agreement with those predicted by the same integral equation theories that incorrectly predict condensation of the pure dipolar fluid. The critical temperature decreases rapidly with decreasing diameter of the neutral species consistent with the lack of gas-isotropic liquid coexistence for pure dipolar hard spheres. Clearly, for the present model demixing and dipolar condensation are not closely related phenomena as they are in the Coulombic systems. The neutral species appears to reduce the formation of dipolar "chains" or "clusters" that inhibit condensation of the purl dipolar hard-sphere fluid.},
	keywords = {COMPUTER-SIMULATION, CRYSTAL MODELS, DIPOLAR HARD-SPHERES, FLUID, GIBBS ENSEMBLE, INSTABILITY, MIXTURE, MONTE-CARLO, orientational order, PHASE},
	isbn = {1063-651X},
	url = {<Go to ISI>://000073768000025},
	author = {Blair, M. J. and Patey, G. N.}
}
