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Paper Information

Journal:   JOURNAL OF THE IRANIAN CHEMICAL SOCIETY(JICS)   JUNE 2011 , Volume 8 , Number 2; Page(s) 574 To 579.
 
Paper: 

INVESTIGATION OF PHASE TRANSITION IN THE ONE-DIMENSIONAL PHOSPHOLIPIDS MODEL BY COMBINATORIAL FACTOR METHOD

 
 
Author(s):  RANJBAR S.*, TASLIMIAN S.
 
* CHEMISTRY COLLEGE, RAZI UNIVERSITY, KERMANSHAH, IRAN
 
Abstract: 

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 could 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.

 
Keyword(s): PHASE TRANSITION, COMBINATORIAL FACTOR METHOD, PHOSPHOLIPIDS MODEL, HELMHOLTZ FREE ENERGY, ORDER-DISORDER
 
References: 
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