Chain formation in low density dipolar hard spheres: A Monte Carlo study

Abstract

The phase diagram of dipolar hard spheres has been determined by Monte Carlo simulation for reduced densities p* ranging from 0.02 to 0.3 and reduced temperatures T* from 0.08 to 0.25. For T* <0.15 the particles are found to associate to form chains which at the highest density are in a polarized ferroelectric state.

Magnetic Properties of Colloidal Suspensions of Interacting Magnetic Particles

“…They compare with results from [161] and [162]. These authors find semi-quantitative agreement concerning the critical points with the results of [163] for Stockmayer-like potentials.…”

“…Weis, Levesque, and Zarragoicoechea [200] Levesque and Weis [165] find ferromagnetic states for λ = 12.25 and φ > 0.6 π 6 . They however now argue that the ferromagnetic phase reported in [162] for smaller φ was probably just a slowly decaying nonequilibrium state. Stevens and Grest [152,157] find spontaneously magnetized fluid phases of Stockmayer particles for λ = 4 and φ > 0.47.…”

Demixing in binary mixtures of apolar and dipolar hard spheres

“…In the past years a considerable research effort has been devoted to the study of phase equilibria of dipolar fluids using both computer simulation techniques [1][2][3][4][5][6][7][8][9] and theory. 10,11 In a first stage, it was commonly assumed that some dispersion interaction should be present for liquid-vapor equilibrium ͑LVE͒ to exist.…”

Exact Solution for a Chainlike Cluster Growth Model

“…Therefore, in this disordered spin system, similar to the previous carbon gas case, the clusterization process is governed firstly by short-range conditions [24] and secondly by the thermal excitation acting as an external bond breaking process. Studies of the liquid-gas transition [26] in systems of hard dipolar spheres [10], with application in ferrofluids [27], phase transitions [26] also show similar clusterization effects at high T and low density, governed by the same short-range conditions and an external bond cutting energy [10,28]. It is evident that the short-range conditions are generic to all disordered systems, in which few component chainlike clusters are dominant.…”