Self-Organization of Semifluorinated Alkanes and Related Compounds at Interfaces: Thin Films, Surface Domains and Two-Dimensional Spherulites

After a brief reminder of the specific properties of fluorocarbons, fluorinated chains and molecular fluorocarbon-hydrocarbon diblocks (semifluorinated alkanes, CnF2n+1CmH2m+1, FnHm) that account for their exceptional aptitude for self-organization, we review recent advances on the self-assembled surface nanodomains that FnHm diblocks form on water and solid surfaces, their shape and size characteristics, and their hierarchical organization into structures of higher complexity. Remarkably indeed, FnHm diblocks, when spread as Langmuir monolayers on water, self-assemble into circular mesoscopic nanodomains that exist even in the absence of lateral pressure, and self-organize into regular hexagonal arrays upon compression. These surface domains can be transferred essentially unchanged onto solid surfaces. They can also be obtained by direct casting or spin coating of solutions of diblocks on solids, or by spontaneous formation on liquid crystals. The nanodomains retain their size, shape and organization upo...