Shape memory effect and rapid reversible actuation of nanocomposite hydrogels with electrochemically controlled local metal ion coordination and crosslinking
文献类型：期刊论文
| 作者 | Cong, Yang; Liu, Shuhui; Wu, Fengxiang; Zhang, Hua; Fu, Jun |
| 刊名 | JOURNAL OF MATERIALS CHEMISTRY B
 |
| 出版日期 | 2020 |
| 卷号 | 8期号:42页码:9679-9685 |
| 关键词 | TOUGH HYDROGELS POLYMER COMPLEX DELIVERY |
| DOI | 10.1039/d0tb02029j |
| 英文摘要 | Rapid and reversible actuation and shape memory effects are critical for biomimetic soft actuators based on polymer hydrogels. However, most conventional hydrogel actuators show very slow actuation or deformation rates in water. It remains a challenge to realize rapid actuations, particularly for hydrogels to actuate in air. Here, a novel strategy to create diverse hydrogel devices with shape memory effects and rapid reversible actuations even in air was demonstrated. This strategy relies on a precise definition of local crosslinking by using multivalent metal ion coordination. This is demonstrated by infiltrating Fe3+ ions into stretchable nanocomposite polyacrylamide hydrogels with the amide groups converted into primary amine groups for multivalent coordination and crosslinking. The Fe3+ coordination with amine groups enhanced the crosslink density and modulus, leading to deswelling. By using an iron rod electrode, the Fe3+ coordination and crosslinking were precisely controlled to generate hydrogels with heterogeneous local crosslinking, including Janus hydrogels, S-shaped hydrogels, and cross-shaped hydrogel grippers. These soft devices were reversibly actuated in tens of seconds when cyclically dehydrated in ethanol and rehydrated in water. Most interestingly, very rapid reversible actuations of a hydrogel device in air were demonstrated by using electro-redox reaction of Fe3+ and Fe2+ in the hydrogel, where the reversible local coordination crosslinking and decomposition served as a hinge to actuate the hydrogel. This strategy based on reversible local coordination and crosslinking may open an avenue for rapid fabrication of hydrogel devices with well-defined structures and actuation properties. |
| 学科主题 | Materials Science |
| 源URL | [http://ir.nimte.ac.cn/handle/174433/20348]  |
| 专题 | 2020专题 2020专题_期刊论文 |
| 作者单位 | 1.Fu, J (corresponding author), Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Peoples R China. 2.Fu, J (corresponding author), Sun Yat Sen Univ, Sch Mat Sci & Engn, Guangzhou 510275, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Cong, Yang,Liu, Shuhui,Wu, Fengxiang,et al. Shape memory effect and rapid reversible actuation of nanocomposite hydrogels with electrochemically controlled local metal ion coordination and crosslinking[J]. JOURNAL OF MATERIALS CHEMISTRY B,2020,8(42):9679-9685. |
| APA | Cong, Yang,Liu, Shuhui,Wu, Fengxiang,Zhang, Hua,&Fu, Jun.(2020).Shape memory effect and rapid reversible actuation of nanocomposite hydrogels with electrochemically controlled local metal ion coordination and crosslinking.JOURNAL OF MATERIALS CHEMISTRY B,8(42),9679-9685. |
| MLA | Cong, Yang,et al."Shape memory effect and rapid reversible actuation of nanocomposite hydrogels with electrochemically controlled local metal ion coordination and crosslinking".JOURNAL OF MATERIALS CHEMISTRY B 8.42(2020):9679-9685. |
入库方式： OAI收割
来源：宁波材料技术与工程研究所
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