Rossegger, E. published the artcilePhoto-switching of surface wettability on micropatterned photopolymers for fast transport of water droplets over a long-distance, Quality Control of 7575-23-7, the main research area is resin methacrylate water droplet photopolymer photoswitching wettability micropatterning.
The present work addresses the directional movement of water droplets (2 μL droplet) across a photopolymer surface over a distance of more than 20 mm. The long-distance movement of the droplet is achieved by inscribing multi-gradients onto the surface, which is realized by a photo-induced increase in wettability amplified by a change in surface texture. To create highly hydrophobic surface characteristics, photo-reactive resin formulations containing an o-nitrobenzyl alc. derivative with terminal acrylate groups, a multi-functional thiol and a fluorinated methacrylate monomer are patterned by visible light-assisted nanoimprint lithog. The needle-like surface microstructures in combination with the fluorine groups of the methacrylate monomer enable the formation of photopolymers with static water contact angles in the range of 140°. Along with the change in the chem. surface composition, prolonged UV exposure under air erodes the surface microstructures leading to fully wettable surfaces. The controlled photo-switching between highly hydrophobic (140°) and fully wettable (7°) photopolymer surfaces enables the introduction of wettability gradients by asym. UV irradiation Linear-shaped gradients rapidly drive a water droplet over a distance of 14 mm. By inscribing the wettability gradient in wedge-shaped patterns, a Laplace pressure gradient is addnl. formed, which allows a directed movement of water droplets over a distance of 22 mm.
Polymer Chemistry published new progress about Carboxylic acids Role: FMU (Formation, Unclassified), FORM (Formation, Nonpreparative). 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Quality Control of 7575-23-7.
Referemce:
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Alcohols – Chemistry LibreTexts