Noncovalent Spiropyran Coatings for Photoinduced Wettability Switching

Bremer, Matthias; Reinke, Ruprecht; Hesseler, Britta; Taale, Mohammadreza; Ingwersen, Daniela; Schwarzer, Stefan; Selhuber-Unkel, Christine and Gerken, Martina (2017): Noncovalent Spiropyran Coatings for Photoinduced Wettability Switching. In: Journal of Nanomaterials, Vol. 2017, 6498601

Abstract

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

• Item Type: Journal article
• Faculties: Chemistry and Pharmacy > Department of Chemistry
• Subjects: 500 Science > 540 Chemistry
• ISSN: 1687-4110
• Language: English