Grafted semiflexible polymers in poor solvents: Toroidal and tower surfacemicelles

We study a system of grafted semiflexible polymers chains in the presence o f a poor solvent in the limit of low grafting densities. The combination of chain rigidity and the adverse solvent-monomer interaction leads to the fo rmation of two kinds of surface micelles. In marked contrast to the case of flexible chains these micelles will usually not be spherical. For rather s tiff or short chains tower-like micelles are expected, while for longer cha ins toroids can form. Unlike the case of bulk polymer solutions these toroi ds are the stable equilibrium state of the system and can consist of many c hains.