Surfactant aggregates at a flat, isotropic hydrophobic surface

We report results of surfactant aggregate morphologies at an amorphous hydr ophobic surface whose roughness is small compared to the size of a micelle. Direct imaging by atomic force microscopy shows that single-chain ionic, n onionic, and zwitterionic surfactants, which form spherical micelles in sol ution, form globular aggregates consistent with half-micelles at an amorpho us hydrophobic surface. This result is consistent with the expected isotrop y of chain-surface interactions.