Volume 85, Number 3, February 2009
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||10 February 2009|
An ubiquitous mechanism for water-like anomalies
Universidade Federal do Rio Grande do Sul, Instituto de Física - 91501-970, Porto Alegre, RS, Brazil
2 Universidade Federal do Rio Grande do Sul, Instituto de Química - 91501-970, Porto Alegre, RS, Brazil
Corresponding author: email@example.com
Accepted: 11 January 2009
Using collision-driven molecular dynamics a system of spherical particles interacting through an effective two-length-scales potential is studied. The potential can be tuned by means of a single parameter, λ, from a ramp (λ = 0.5) to a square-shoulder potential (λ =1.0) representing a family of two-length-scales potentials in which the shortest interaction distance has higher potential energy than the largest interaction distance. For all the potentials, ranging between the ramp and the square-shoulder, density and structural anomalies were found, while the diffusion anomaly is found in all but in the square-shoulder potential. The presence of anomalies in square-shoulder potential, not observed in previous simulations, confirms the assumption that the two-length-scales potential is an ubiquitous ingredient for a system to exhibit water-like anomalies.
PACS: 61.20.Ja – Computer simulation of liquid structure / 61.25.Em – Molecular liquids / 65.20.-w – Thermal properties of liquids
© EPLA, 2009
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