Comparative study of amphiphilic hyperbranched and linear polymer stabilized organo-soluble gold nanoparticles as efficient recyclable catalysts in the biphasic reduction of 4-nitrophenol

Immobilization of Ag(0) nanoparticles on quaternary ammonium functionalized polyacrylonitrile fiber as a highly active catalyst for 4-nitrophenol reduction

Ag(0) nanoparticles were immobilized on various pyridine salt, imidazole salt and quaternary ammonium functionalized polyacrylonitrile fibers (PANFs) to prepare Ag(0)-immobilized fiber catalysts. The catalytic activities of these immobilized catalysts for 4-nitrophenol (4-NP) reduction were detected. Among them, the quaternary ammonium fiber with butyl group immobilized Ag(0) nanoparticle catalyst PANQA-C4F-Ag(0) showed the best catalytic activity, and can effectively catalyze 4-nitrophenol (4-NP) reduction with a high conversation rate of 99.6%. Furthermore, PANQA-C4F-Ag(0) can be easily recovered, and it was reused 20 times with little decrease in catalytic activity and moderate Ag retention (53.5%). Notably, the cationic groups in the functionalized fibers can stabilize Ag(0) nanoparticles through electrostatic interactions and steric effects, and play an important role in phase transfer catalysis. Accordingly, possible mechanisms for the 4-NP reduction catalyzed by PANQA-C4F-Ag(0) were proposed.

Polyamino amphiphile mediated support of platinum nanoparticles on polyHIPE as an over 1500-time recyclable catalyst

For supported metal nanoparticles, the ligand/support is crucial to their catalytic activity, stability and recyclability.

Hyperbranched pyridylphenylene polymers based on the first-generation dendrimer as a multifunctional monomer

The A₆ + B₂ approach to hyperbranched polymers based on the dendrimer (A₆) as a multifunctional monomer and bis(cyclopentadienone)s (B₂) holds promise for the one-pot synthesis of well-defined polymers with perfect dendritic fragments in the backbone.

Functional hyperbranched polymers with advanced optical, electrical and magnetic properties

This review summarizes the recent progress in functional HBPs and their application in optics, electronics and magnetics, including light-emitting devices, aggregation-induced emission materials, nonlinear optical materials, chemosensors, solar cells, magnetic materials, etc., and provides outlooks for further exploration in the field.

Two-dimensional structure Au nanosheets are super active for the catalytic reduction of 4-nitrophenol

Two-dimensional structure Au nanosheets with controlled thicknesses of (a) ∼15 nm, (b) ∼35 nm, (c) ∼50 nm were synthesized by solution reduction method, and the reduction of 4-nitrophenol (4-NP) by UV-vis spectra of Au nanosheets with controlled thicknesses has been greatly enhanced.

Advances in nanoreactor technology using polymeric nanostructures

Site isolation, compartmentalization and substrate specificity are a few of the characteristics responsible for the catalytic efficiency demonstrated by enzymes in natural systems. In efforts to mimic these highly efficient systems, research has been directed towards macromolecular chemistry. Robust polymer assemblies can create a favorable and isolated environment around the catalytic site allowing specific and sometimes incompatible reactions to take place within this protected reaction pocket. Further exploring the use of 'smart' polymers, control over both the catalytic activity and substrate specificity is achieved. In addition, polymeric systems provide the opportunity for recycling of the active catalysts, further enhancing the advantages of polymer supported catalytic systems.