[AzoTAB] = 0. 5 mM and coexisted with a small fraction of restricted networks at [AzoTAB] = 1 mM (Fig. ). Like for DNA condensation, AzoTAB was thus found to induce nanotube association into superstructures at a higher concentration when a short UV irradiation was applied. As a consequence, we could identify an AzoTAB concentration (0.5 mM) where the system organized into individual nanotubes (+UV) or superstructures (-UV) in a photodependent manner (Movie S3). This creates ground for dynamic photoactuation of nanotube higher-order organization and superstructure formation.