15-20 June 2014
Laurentian University / Université Laurentienne
America/Toronto timezone
Welcome to the 2014 CAP Congress! / Bienvenue au congrès de l'ACP 2014!

Inverse melting and phase behaviour of core-softened attractive disks

18 Jun 2014, 09:45
A-226 (Laurentian University / Université Laurentienne)


Laurentian University / Université Laurentienne

Sudbury, Ontario
Oral (Student, In Competition) / Orale (Étudiant(e), inscrit à la compétition) Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM) (W1-5) Biophysics/Soft Condensed Matter III: Phase Behaviour and Kinetics - DCMMP-DMBP / Biophysique et matière condensée molle III: Comportement et cinétique de phase - DPMCM-DPMB


Ahmad Almudallal (Memorial University of Newfoundland)


We use several computer simulation techniques to study the phase behaviour of a simple, two dimensional model that was originally devised to understand the anomalous properties of liquid water and their connection to a hypothesized liquid-liquid critical point. The interaction potential of this one-component system comprises a repulsive shoulder and an attractive square well. In our phase diagram of the model we find that the system exhibits inverse melting, for which the system crystallizes upon isobaric heating, over a small range of pressure [1]. We find that the range of pressures over which inverse melting occurs can be enlarged by increasing the extent of the repulsive shoulder [2]. Although our study is in 2D, we find that the transition is first order and to a liquid, rather than to a hexatic or quasicrystal phase. The increase in the range of inverse melting results in a change in the topology of the phase diagram, leading to further interesting behaviour. [1] A. M. Almudallal, S. V. Buldyrev, and I. Saika-Voivod, J. Chem. Phys. 137, 034507 (2012). [2] A. M. Almudallal, S. V. Buldyrev, and I. Saika-Voivod, arXiv:1401.0679 (2014).

Primary author

Ahmad Almudallal (Memorial University of Newfoundland)


Prof. Ivan Saika-Voivod (Memorial University of Newfoundland) Prof. Sergey Buldyrev (Yeshiva University)

Presentation Materials