Noncovalent Spiropyran Coatings for Photoinduced Wettability Switching

Bremer, Matthias ORCID; Reinke, Ruprecht; Hesseler, Britta; Taale, Mohammadreza ORCID; Ingwersen, Daniela ORCID; Schwarzer, Stefan ORCID; Selhuber-Unkel, Christine ORCID; Gerken, Martina ORCID

The noncovalent binding of spiropyran to candle-soot-covered surfaces is investigated for wettability switching using a coatingprocedure realized with a drop casting process of using 0.001 mol/L spiropyran in a 5 : 1 toluene-acetone mixture. Scanning electronmicroscopy images reveal a resulting surface with spiropyran flakes in the candle soot. A reversible switching with UV light andblue or green light is achieved, starting from an initial contact angle of 130∘±9.68∘. The highest contact angle difference is 41∘andreversibility has been shown for several switching cycles. Hence, our methods provide an easy-to-use strategy to generate surfaces with switchable wettability.



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Bremer, Matthias / Reinke, Ruprecht / Hesseler, Britta / et al: Noncovalent Spiropyran Coatings for Photoinduced Wettability Switching. 2017.

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