Design of Synthetic Vehicles through Self-Assembly of End-Functionalized Nanotubes and Lipids

Via Dissipative Particle Dynamics (DPD) approach, we study the self-assembly of amphiphilic nanotubes and lipids immersed into a hydrophilic solvent. Each nanotube encompasses an ABA architecture, with a hydrophobic stalk and two hydrophilic ends.To allow controlled transport through the nanotube, we introduce hydrophilic tethers at one or both ends of the nanotube. Individual lipids are composed of a hydrophilic head group and two hydrophobic tails. We show that an energetically unfavorable interaction between the solvent and the hydrophobic segments of the nanotube and the lipids drive them to self-assemble so as to shield the hydrophobic entities from the hydrophilic solvent. The equilibrium self-assembled structures formed depend upon the concentrations of the lipids and nanotubes, and the presence of hydrophilic end-tethers. We isolate the conditions that promote the formation of specific equilibrium self-assembled structures. Ultimately, these self-assembled structures of nanotube-lipid systems can be used for making hybrid control release vehicles.