Ultralight, Soft Polymer Sponges by Self-Assembly of Short Electrospun Fibers in Colloidal Dispersions
Gaigai Duan , Shaohua Jiang , Valérie Jérôme , Joachim H. Wendorff , Amir Fathi , Jaqueline Uhm , Volker Altstädt , Markus Herling, Josef Breu , Ruth Freitag , Seema Agarwal , and Andreas Greiner, Adv. Funct. Mater. 2015, 25, 2850–2856
Ultralight polymer sponges are prepared by freeze-drying of dispersions of short electrospun fi bers. In contrast to many other highly porous materials, these sponges show extremely low densities (<3 mg cm −3 ) in combination with low specifi c surface areas. The resulting hierarchical pore structure of the sponges gives basis for soft and reversibly compressible materials and to hydrophobic behavior in combination with excellent uptake for hydrophobic liquids. Owing to their large porosity, cell culturing is successful after hydrophilic modifi cation of the sponges.
Functionalization of gold nanoparticles in two-phase system -via ligand exchange-
The short video shows the well-established method of ligand-exchange, which is used for the introduction of ligands to nanoparticles in one-phase and two-phase systems. Here is shown ligand exchange of citric acid ligands on gold nanoparticles against vinyl-pyridine functionalized polystyrene.Layout fehlt: video