自愈水凝胶
杰纳斯
胶粘剂
杰纳斯粒子
化学工程
肺表面活性物质
海藻酸钠
粘附
纳米技术
材料科学
聚合物
聚合
化学
高分子化学
钠
图层(电子)
复合材料
有机化学
工程类
作者
Huowen Chen,Chuchu Zheng,Fusheng Zhang,Zhuqin Zhang,Li Juan Zhang
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2023-11-10
卷期号:9 (45)
标识
DOI:10.1126/sciadv.adj3186
摘要
Janus adhesive hydrogels have one-sided adhesive properties and hold promising applications in the health care field. However, a simple method for synthesizing Janus hydrogels is still lacking. In this study, we introduce an innovative method to prepare Janus hydrogels by harnessing a fundamental phenomenon: the self-aggregation of surfactants at high concentrations at the water-air interface. By combining a small amount [0.8 to 3.2 weight %, relative to mass of acrylamide (AM)] of sodium α-linoleate (LAS) with AM through free radical polymerization, we have synthesized Janus adhesive hydrogels. The Janus hydrogels exhibit remarkable adhesive strength and adhesive differences, with the top side (84 J m −2 ) being 21 times stronger than the bottom side, also an excellent elongation rate. Through comprehensive experiments, including chemical composition, surface morphology, and molecular dynamics (MD) simulations, we thoroughly investigate the mechanisms of the hydrogel’s heterogeneous adhesion. This study presents an easy, efficient, and innovative method for preparing one-sided adhesive hydrogels.
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