## Abstract

The phase diagrams of systems made up of hard spheres interacting with attractive potentials of the form -1/r(3+sigma) are calculated using Monte Carlo simulations, second-order thermodynamic perturbation theory, and an augmented van der Waals theory. In simulations of the systems with sigma=0.1, 1, and 3, fluid-solid coexistence results are obtained using the Gibbs-Duhem integration technique; simulation data for the vapor-liquid coexistence envelopes and critical points are taken from previously published work [P. J. Camp and G. N. Patey, J. Chem. Phys. 114, 399 (2001)]. It is shown that the agreement between the theoretical and simulated phase diagrams improves as the range of the potential is increased, reflecting the decreasing role of short-range correlations in determining the bulk thermodynamics. In the extreme case of sigma=0.1 both theories are in excellent agreement with simulations. Phase diagrams for systems with sigma=4, 5, and 6 are computed using second-order thermodynamic perturbation theory. The results indicate that the vapor-liquid transition becomes metastable with respect to freezing when sigmagreater than or similar to5, in broad agreement with results for the hard-sphere attractive Yukawa system which is commonly used to model colloidal particles, globular proteins, and nanoparticles.

Original language | English |
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Article number | 011503 |

Pages (from-to) | - |

Number of pages | 8 |

Journal | Physical Review E - Statistical, Nonlinear and Soft Matter Physics |

Volume | 67 |

Issue number | 1 |

DOIs | |

Publication status | Published - Jan 2003 |

## Keywords

- LONG-RANGE INTERACTIONS
- CRITICAL EXPONENTS
- CRITICAL-BEHAVIOR
- MONTE-CARLO
- FLUIDS
- COEXISTENCE
- TRANSITION
- POTENTIALS
- SIMULATION
- MODEL