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High-Fidelity Hydrogel Thin Films Processed from Deep Eutectic Solvents

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Title: High-Fidelity Hydrogel Thin Films Processed from Deep Eutectic Solvents
Authors: Delgado, David E. Browse this author
King, Daniel R. Browse this author
Cui, Kunpeng Browse this author →KAKEN DB
Gong, Jian Ping Browse this author →KAKEN DB
Shull, Kenneth R. Browse this author
Keywords: polyampholytes
polyelectrolyte complexes
ionic liquids
deep eutectic solvents
Issue Date: 23-Sep-2020
Publisher: American Chemical Society
Journal Title: ACS applied materials & interfaces
Volume: 12
Issue: 38
Start Page: 43191
End Page: 43200
Publisher DOI: 10.1021/acsami.0c09618
Abstract: Polyampholyte (PA) hydrogels are a fascinating class of soft materials that can exhibit high toughness while retaining self-healing characteristics. This behavior results from the random distribution of oppositely charged monomers along the polymer chains that form transient bonds with a range of bond strengths. PAs can be dissolved in aqueous salt solutions and then recast via immersion precipitation, making them particularly useful as surface coatings in biomedical applications. Moreover, this immersion precipitation technique allows these PA hydrogels to be fabricated into films less than 100 nm. One critical challenge to this aqueous processing method is the recrystallization of the salt upon water evaporation. Such recrystallization can disrupt the hydrogel morphology especially in thin films. In this study, a deep eutectic solvent (DES) formed from urea and choline chloride was used to dissolve PAs made from p-styrenesulfonic acid sodium salt and 3-(methacryloylamino)propyl trimethylammonium chloride. This DES has a freezing point of 12 degrees C, allowing it to remain stable and liquid-like at room temperatures. Thus, these PAs can be processed in DES solutions, without this issue of recrystallization and with simple methods such as spin coating and dip coating. These methods allow these hydrogels to be used in thin (<100 nm)-film coating applications. Finally, the complete miscibility of DES in water allows a wider range of one-phase compositions and expands the processing window of these polyampholyte materials.
Type: article
Appears in Collections:国際連携研究教育局 : GI-CoRE (Global Institution for Collaborative Research and Education : GI-CoRE) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)


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