Journal of the Iranian Chemical Society

, Volume 8, Issue 2, pp 574–579 | Cite as

Investigation of phase transition in the one-dimensional phospholipids model by combinatorial factor method



In this study, using a one-dimensional phospholipids model, we have introduced an exact combinatorial factor method for the investigation of order-disorder in the phospholipids lattice. Our assumption was that the lattice was composed of six groups, and for simplicity, we assumed that the total energy of the lattice can be considered as the rotational energy of gauche molecules and the nearest neighbor interactions between trans molecules. Using the combinatorial factor method (CFM), the total energy and the corresponding constrains, the Helmholtz free energy was minimized. Finally, the thermodynamic properties of the one-dimensional lattice including the internal energy, entropy, and heat capacity were determined, exactly. The results show that, adopting such a model and under specific conditions, a phase transition, similar to the one in Onsager transition, takes place.


Phase transition Combinatorial factor method Phospholipids modelPhospholipids model Helmholtz free energy Order-disorder 


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Copyright information

© Iranian Chemical Society 2011

Authors and Affiliations

  1. 1.Chemistry CollegeRazi UniversityKermanshahIran

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