The name is absent

Figure 4.2: (a) Self-assembly of lipid molecules. Lipid bilayer on the left and Micelle on
the right. The head groups face outside towards the solvent while the long tail groups hide
away from the solvent, (b) Schematic of the lipid and solvent molecule. A lipid molecule
has a head group with two bigger segments (gray) and two tail groups with eight smaller
segments (black) in each. The solvent molecule (white) is of the same size as the tail
segments.

solvent is included in the model as a single segment with σ_s = σ_t. The segment-
segment interactions are based on the Lennard-Jones (LJ) potential.

U_aβ(r) = U⅛^,_β(r) - u⅛(τ_c∖

where

⅛T) = 4⅛, [(⅛)¹² „ (⅛)^β] ,             (4.40)

and r_c is the cut-off distance. If r_c = 2¹∕⁶σ_aβ the, interaction between segments a
and β is purely repulsive. The attractive interactions are included by taking a larger
cut-off, r_c = 3.5σ_aβ. The energy constants for all the segments (head, tail or solvent),

98

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