Sommaire:

Structure formation of nanoparticles at interfaces is governed by their effective interactions. I discuss electrostatic and capillary interactions, which become long-ranged at interfaces (in contrast to bulk suspensions) and are the source of novel phenomena. Interactions of charged particles point to a high sensitivity to specific properties of solvated ions and thus these interactions may serve as "probes" for the elecetrostatic double layer. Suitable extensions of the well-known Poisson-Boltzmann equation are discussed which may capture these interactions. - The second part deals with classical density functional calculations for colloidal crystal-liquid interfaces and a discussion of suitable crystallinity order parameters. Results for hard spheres are presented and compared to very recent simulation results for the orientation dependent surface tension.

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