Robust, superhydrophobic and self-cleaning films were fabricated using nano- or microstructured cellulose fatty acid esters, which were prepared via nanoprecipitation. The superhydrophobic films could be coated on diverse surfaces with non-uniform shapes by distinct coating techniques.
Umhüllungstaktik: Peptid‐Polymer‐Hybridnanoröhren wurden hergestellt, deren Struktur durch selbstorganisierte cyclische Peptide vorgegeben wird und deren Oberflächenchemie durch eine synthetische Polymerhülle eingestellt werden kann. Diese wird in situ mithilfe von Initiatoren erzeugt, die auf den cyclischen Peptiden gebunden sind (Bild: AFM‐Aufnahme von Peptid‐Polymer‐Hybridnanoröhren auf einem Siliciumwafer).
Manipulation von Mikropartikeln: Die Photoisomerisierung von grenzflächenaktiven Substanzen, die an einer Gas‐Flüssigkeits‐Grenzfläche adsorbiert sind, treibt einen Marangoni‐Fluss an, in dem kleine Partikel gefangen und manipuliert werden können. Durch Umschalten der Laserwellenlänge kann ein Fluss erzeugt werden, der entweder hin zum oder weg vom Fokus führt. Das Bild zeigt ein im Zufluss gefangenes Partikel in der Fokalregion.
This scientific−technical approach describes a unique self‐structuring coating material made of wax and polysaccharide derivatives, which results in extremely water‐repellent properties if applied to solid surfaces. When cooling the coating down from the molten state, the material forms a nanostructured superhydrophobic surface within seconds. This possibility of a fast thermally induced regeneration of nanoscale surface textures creates the potential to restore superhydrophobic coating properties even after mechanical damage caused, among others, by long‐term use and complex processing and machining steps. Therefore, this coating material has great potential for engineering applications such as superhydrophobic wettability of paper surfaces. Depending on a particular application, there are different requirements for the interaction of paper with water. The highest possible water resistance, which is achieved by superhydrophobic properties, is a quality feature for a majority of paper products, such as packaging materials or novel construction materials, since the ingress of moisture is a major cause of paper damage.
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