Molecular models of lipid bilayers have ignored the interface of two monolayers of nanobiomembranes in detail by now, however in this paper a new physical model is proposed based on variation of surface tension in the interface of two monolayers of membrane. Experimental results have shown that some peptides and proteins like antimicrobial peptides and cytotoxins are able to change the shape of — or in some cases to destroy — the bilayer membrane during insertion to external monolayer. All interfaces in nanobiomembrane are liquid-liquid type. In this paper appropriate ensembles to simulate liquid/liquid interfaces are presented with special focus on proper ones for surface tension analysis.

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