Dendritic Amphiphile Mediated One-Pot Preparation of 3D Pt Nanoparticles-Decorated PolyHIPE as a Durable and Well-Recyclable Catalyst
Dendritic Amphiphile Mediated One-Pot Preparation of 3D Pt Nanoparticles-Decorated PolyHIPE as a Durable and Well-Recyclable Catalyst
复制标题
树枝状两亲物介导的一锅法制备 3D Pt 纳米颗粒修饰的 PolyHIPE 作为耐用且可回收的催化剂
DOI：
10.1021/acsami.5b06283
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发表时间：
2015-09-23
影响因子：
9.5
通讯作者：
Jin, Ming
中科院分区：
文献类型：
--
作者：
Liu, Honghai;Wan, Decheng;Jin, Ming
描述了将铂纳米颗粒（PtNPs）直接组织到宏观和坚固的材料上。PtNPs通过树枝状两亲物原位产生和稳定，其中后者由超支化聚乙烯亚胺（PEI）作为核和聚（苯乙烯-co-2-乙基己基丙烯酸酯（P（St-EHA））作为壳组成。所得的Pt@PEI@P（St-EHA）在与两相水和油（EHA和二甲基丙烯酸酯交联剂在甲苯中的混合物）混合时，可以沿着水/油（W/O）界面自组装并产生稳定的乳液。当W/O = 80/20（体积比）时，形成高内相乳液（HIPE），并可从根本上转变为具有弹性的多孔整体结构，即Pt-polyHIPE，其表面修饰有PtNPs。Pt-聚HIPE在机械上是坚固的，并且二甲基丙烯酸酯的交联均匀性是强度的原因。Pt-聚HIPE显示出活性催化性能，通过还原4-硝基苯酚进行评价。该材料是方便和良好的可回收的，至少在20个循环内显示催化活性没有降低。能量色散X-射线光谱和热重分析也支持充分保留的Pt物种，其中的多价和多配体PEI应该负责此属性。
Straightforward organization of platinum nanoparticles (PtNPs) onto a macroscopic and robust material is described. PtNPs are in situ produced and stabilized by a dendritic amphiphile, where the latter consists of a hyperbranched polyethylenimine (PEI) as core and poly(styrene-co-2-ethylhexyl acrylate (P(St-EHA)) as shell. The resulting Pt@PEI@P(St-EHA), upon mixing with biphasic water and oil (a mixture of EHA and a dimethacrylate cross-linker in toluene), can self-assemble along the water/oil (W/O) interface and result in a stable emulsion. At W/O = 80/20 (volume ratio), a high internal phase emulsion (HIPE) forms and can be radically transformed into an open-cellular and elastic monolith termed Pt-polyHIPE, with PtNPs decorated on the surface. The Pt-polyHIPE is mechanically robust, and the cross-linking homogeneity by the dimethacrylate is responsible for the strength. The Pt-polyHIPE shows an active catalytic property, as evaluated by reduction of 4-nitrophenol. The material is conveniently and well recyclable, showing no decrease in catalytic activity at least within 20 cycles. Energy-dispersive X-ray spectra and thermogravimetric analysis also support sufficient retaining of the Pt species, where the multivalent and multiligand PEI should be responsible for this property.