Large-scale preparation of a 3D patchy surface with dissimilar dendritic amphiphiles.
Large-scale preparation of a 3D patchy surface with dissimilar dendritic amphiphiles.
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DOI：
10.1039/c7sm02328f
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发表时间：
2018-02
期刊：
影响因子：
3.4
通讯作者：
Yanyan Feng;Yujia Wan;M. Jin;Decheng Wan
中科院分区：
文献类型：
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作者：
Yanyan Feng;Yujia Wan;M. Jin;Decheng Wan
我们在这里展示了具有不同微片的宏观和多孔整体的大规模表面装饰的第一个例子。支化聚乙烯亚胺(PEI)与聚丙二醇(PPG)发生烷基化反应，得到了反胶束状的树枝状两亲分子PEI@PPG。PEI@PPG的剩余氨基的过烷基化和部分季胺化反应生成了PEI-N+@PPG的阳离子树枝状两亲分子。这两个树枝状两亲物共同稳定油包水高内相乳液，以制备宏观尺寸的开孔单体，单体孔表面由阳离子和中性树枝状两亲物决定。中性两亲分子的氨基进一步衍生为阴离子二硫代氨基甲酸酯。由此产生的整体，连同表面不同的功能斑块，同时将多种阴离子和阳离子微污染物从水中消除到非常低的残留量，并提供由pH触发的顺序释放。我们的策略是使用不同的树枝状两亲分子而不是嵌段共聚物作为表面构建块，可以使得到的表面除了传统的凝聚结构外，还具有健壮的和预先设计的微环境，因此可以提供更多的功能。
We show here the first example of the large-scale surface decoration of a macroscopic and porous monolith with dissimilar micropatches. Branched polyethylenimine (PEI) is alkylated with poly(propylene glycol) (PPG), leading to a reverse-micelle-like dendritic amphiphile of PEI@PPG. Peralkylation and partial quaternization of the residual amino groups of PEI@PPG produces a cationic dendritic amphiphile of PEI-N+@PPG. The two dendritic amphiphiles jointly stabilize a water-in-oil high-internal-phase emulsion to prepare open-cellular monoliths of macroscopic size, with the monolith pore surface dictated by the cationic and neutral dendritic amphiphiles. The amino groups of the neutral amphiphile are further derivatized into anionic dithiocarbamates. The resulting monolith, along with the dissimilar functional patches on the surface, simultaneously eliminates multiple anionic and cationic micropollutants from water to very low residues, and affords the pH-triggered sequential release. Our strategy of using dissimilar dendritic amphiphiles rather than block copolymers as surface building blocks can confer the resulting surface with robust and predesigned microenvironments besides the conventional coacervate structure, and thus can afford more functions.