Rapid Accessible Fabrication and Engineering of Bilayered Hydrogels: Revisiting the Cross-Linking Effect on Superabsorbent Poly(acrylic acid)
| Autor: | Hea Ji Kim, Kyoung-Min Lee, Doyoung Jung, Hyemin Lee, Yuree Oh, Ji Young Chang, Changsun Han, Hyungwoo Kim |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Fabrication General Chemical Engineering Bilayer Radical polymerization 02 engineering and technology General Chemistry Bending 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Article 0104 chemical sciences lcsh:Chemistry chemistry.chemical_compound Chemical engineering chemistry lcsh:QD1-999 Homogeneous Self-healing hydrogels Deformation (engineering) 0210 nano-technology Acrylic acid |
| Zdroj: | ACS Omega, Vol 3, Iss 3, Pp 3096-3103 (2018) ACS Omega |
| ISSN: | 2470-1343 |
| Popis: | Superabsorbent hydrogels are significant not only in materials science but also in industries and daily life, being used in diapers or soil conditioners as typical examples. The main feature of these materials is their capacity to hold considerable amount of water, which is strongly dependent on the cross-linking density. This study focuses on the preparation of hydrogels by reweighing the effect of cross-linking density on physical properties, which provides green fabrication of bilayered hydrogels that consist of homogeneous structural motifs but show programmed responses via sequential radical polymerization. In particular, when two hydrogel layers containing different cross-linking densities are joined together, an integrated linear bilayer shows heterogeneous deformation triggered by water. We monitor the linear hydrogel bilayer bending into a circle and engineer it by incorporating disperse dyes, changing colors as well as physical properties. In addition, we demonstrate an electric circuit switch using a patterned hydrogel. Anisotropic shape change of the polyelectrolyte switch closes an open circuit and lights a light-emitting diode in red. This proposed fabrication and engineering can be expanded to other superabsorbent systems and create smart responses in cross-linked systems for biomedical or environmental applications. |
| Databáze: | OpenAIRE |
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