Biomimetic Transferable Surface for a Real Time Control over Wettability and Photoerasable Writing with Water Drop Lens

Research output: Contribution to journalArticleScientificpeer-review

Researchers

Research units

  • Kiel University
  • Helmholtz-Zentrum Geesthacht
  • National Research Center

Abstract

We demonstrate a transferable device that can turn wettability of surfaces to sticky or slippy, as per requirement. It is composed of polymeric yarn with a fibrous structure, which can be lifted and placed on any surface to render it the unique wettability properties. We introduce Polyvinylidenefluoride (PVDF) random fiber as biomimetic rose petal surface. When it is decorated with PVDF nanofibers yarns, the random mesh transform from rose petal sticky state into grass leaf slippy state. When it is placed on sticky, hydrophilic metal coin, it converts the surface of the coin to super hydrophobic. Adjustments in the yarn system, like interyarn spacing, can be done in real time to influence its wettability, which is a unique feature. Next, we load the polymer with a photochromic compound for chemical restructuring. It affects the sliding angle of water drop and makes the fibers optically active. We also demonstrate a "water droplets lens'' concept that enables erasable writing on photochromic rose petal sticky fibrous surface. The droplet on a highly hydrophobic surface acts as a ball lens to concentrate light onto a hot spot; thereby we demonstrate UV light writing with water lenses and visible light erasing.

Details

Original languageEnglish
Article number7407
Number of pages7
JournalScientific Reports
Volume4
Publication statusPublished - 10 Dec 2014
MoE publication typeA1 Journal article-refereed

    Research areas

  • HIGH ADHESIVE FORCE, SUPERHYDROPHOBIC SURFACE, NANOSTRUCTURES, FABRICATION, NANOFIBERS, MATRIX, STATE, FILMS

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