C. Position of an Isolated Fullerene within the Lipid
Bilayer. Figure 5 shows the free energy (POMF) of the lipid
bilayer/single fullerene system as a function of the position of
the center-of-mass of the fullerene relative to the center-of-mass
of the lipid bilayer. In contrast to small hydrophobic solutes,
the large C
60
fullerene prefers to be situated off of the center
plane. As show in Figure 2, the atomic density within the bilayer
is lowest at the center layer and increases toward the head group
layer. Favorable dispersion interactions between the atomically
dense surface of the fullerene and its environment (e.g., see
Figure 3) result in a migration of the fullerene toward the denser
region of the bilayer. As shown in Figure 2, a fullerene C
the most favorable interaction (Lennard-Jones energy) with its
surroundings at a position of 10-15 Å from the bilayer center.
However, the minimum in the POMF is around position of 6-7
Å. Moreover, the free energy steeply increases as C
fullerene
moves more than 8 Å from the center of the bilayer despite the
favorable nonbonded interaction with surrounding. This mismatch
in position of the minima for the energy and the free
energy can be explained by distortion of the bilayer. For
positions larger than 8 Å away from the center of the bilayer
the fullerene begins to penetrate into the more structured head
group region causing significant structural distortion. The latter
is illustrated in Figure 6, where the relative position of head