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Spin‐one lattice gas model for isotherm‐reversal in spin‐labelled lipid monolayers
Author(s) -
Chakraborty K. G.,
Baret J. F.
Publication year - 1983
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221190105
Subject(s) - phase diagram , monolayer , condensed matter physics , hamiltonian (control theory) , spin model , lattice (music) , thermodynamics , physics , chemistry , phase (matter) , quantum mechanics , mathematics , mathematical optimization , biochemistry , acoustics
A suitably extended version of a spin‐one lattice gas model, embodying the basic ideas of Cadenhead and Müller‐Landau and Bell and Dunne, is employed to study the “isotherm reversal” appearing in the pressure—area phase diagram of spin‐labelled monolayers. Considering the nine different configurations of molecules as concieved by Bell and Dunne the Hamiltonian is developed and the molecular field approximation is applied to derive the expression for pressure. The phase diagrams are drawn for various values of the model parameters and it is seen that the isothermreversal is a characteristic of the model itself. Unlike the one‐dimensional model of Bell and Dunne, the present model shows the phase transition from a liquid‐expanded to a liquid‐condensed phase.