Single-Chain Janus Nanoparticle by Metallic Complexation

Single-Chain Janus Nanoparticle by Metallic Complexation
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通过金属络合制备单链 Janus 纳米粒子

DOI:
10.1021/acs.macromol.9b02388
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发表时间:
2020-01
期刊:
影响因子:
5.5
通讯作者:
Yang Zhenzhong
Yang Zhenzhong
中科院分区:
化学1区
文献类型:
--
作者:
Xiang Dao;Jiang Bingyin;Liang Fuxin;Yan Litang;Yang Zhenzhong

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示例聚合物聚苯乙烯-嵌段-聚(2-乙烯基吡啶)-嵌段-聚环氧乙烷 (PS-b-P2VP-b-PEO) 的单链 Janus 纳米颗粒是通过 P2VP 与八羰基钴络合的分子内交联实现的,而金属络合物则纳入交联核内。通过预处理在链上引入静电相互作用至关重要,从而确保浓溶液(例如 30 mg/mL)中的分子内交联。在分散体中热解后,复合物分解,在 P2VP 核心内形成钴。磁响应单链 Janus 复合纳米粒子是由 P2VP/Co 核心与 PS 和 PEO 单链缀合到相对侧而得。 Janus复合纳米颗粒表现出金属钴的高催化活性和磁响应性能以及PS和PEO单链的界面活性。由此证明了硝基芳香族化合物在乳液界面的高效催化还原,并且很容易用磁铁回收。
Single-chain Janus nanoparticle of the example polymer polystyrene-block-poly(2-vinylpyridine)-block-polyethylene oxide (PS-b-P2VP-b-PEO) was achieved by intramolecular crosslinking via complexation of P2VP with cobalt octacarbonyl, while the metallic complex was incorporated within the crosslinked core. It is crucial to introduce electrostatic interaction along the chain by pretreatment and thus ensure the intramolecular crosslinking in concentrated solutions, for example, 30 mg/mL. After thermolysis in the dispersion, the complex is decomposed achieving cobalt within the P2VP core. A magnetic responsive single-chain Janus composite nanoparticle was derived with the P2VP/Co core conjugated with PS and PEO single chains onto the opposite sides. The Janus composite nanoparticle displays highly catalytic activity and magnetic responsive performance from the metallic cobalt and interfacial activity from the PS and PEO single chains. A highly efficient catalytic reduction of nitroaromatic compounds at emulsion interfaces was demonstrated thereby, which was easily recycled with a magnet.
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