Ultrathin Cross-Linked Networks at the Interface between Oil and Water: Structure, Properties, and Preparative Perspectives

Abstract

The self-association process of surface-active monomers can be used to synthesize ultrathin cross-linked networks at fluid interfaces. We have systematically studied transient networks, which were stabilized and cross-linked by hydrogen bonds, Coulomb interactions, or van der Waals attraction forces. At the planar surface, we measured the rheological properties of these films. In addition to these experiments, we have also investigated typical structures of these networks by means of Brewster angle microscopy. The results of these investigations are that the surfactant molecules tend to build up two-dimensional aggregates, which are interconnected to form elongated network strands. Due to their simple synthesis, two-dimensional networks can serve as excellent model systems for advanced investigations of the stability and deformation properties of living cells. In addition to this, we analyzed the film-forming behavior of molecular tweezers, which are able to bind selectively electron deficient aromatic and aliphatic substrates.