on the surface are used for potential applications in targeted drug delivery.
In this study we investigate the
effects of polymer grafting on the phase behaviour of
bilayers using dissipative particle dynamics.
The bilayer is made up of a single chain containing one head bead and
nine tail beads. The polymer is made up of 20 hydrophilic beads
and the bilayer is maintained in a tensionless state using a barostat.
The bilayer shows a sharp gel to liquid crystal
transition in the absence of the grafted polymer.
At a grafting density of 0.25, two additional phases are observed in
the gel to liquid crystalline transition. At low temperatures
the phase is transformed to the tilted phase and
upon further increase in temperature the interdigitated
phase is observed. The occurrence of the
tilted phase is accompanied by an increase in the area
per head group of the lipid and grafting was found to broaden
the temperature range for the gel to liquid crystalline transition.
Our study shows that the grafting density can be used to control the
temperature range and occurrence of a given bilayer phase.