Hairy Hybrid Microrattles of Metal Nanocore with Functional Polymer Shell and Brushes

Preparation of multifunctional hollow microporous organic nanospheres via a one-pot hyper-cross-linking mediated self-assembly strategy

Multifunctional hollow microporous organic nanospheres (HMONs) were successfully synthesized via a one-pot hyper-cross-linking mediated self-assembly strategy.

Yolk-Shell Nanocomposites of a Gold Nanocore Encapsulated in an Electroactive Polyaniline Shell for Catalytic Aerobic Oxidation

Noble metal nanoparticles (NPs) have been widely applied in nanocatalysis owing to the benefits associated with their miniature size. However, improving their stability and reusability during catalytic applications still remains a great challenge. To this end, monodispersed gold@void@polyaniline yolk-shell nanocomposites (Au@void@PANI YSNs) were synthesized using bottom-up template-assisted methods. Au@SiO2 NPs, prepared from a modified sol-gel process, were used as templates for the thiol-ene click reaction with 4-vinylaniline (VAn) to immobilize the aniline moieties, which later performed as the initiation sites for the oxidative copolymerization of aniline from the outer surface of the Au@SiO2-VAn NPs with an electroactive PANI shell (Au@SiO2@PANI NPs). The silica layer sandwiched between the Au core and PANI shell was selectively removed by aqueous hydrofluoric acid to produce Au@void@PANI YSNs with a movable Au core. The electroactive PANI shell not only serves as a physical barrier that prevents the self-association of Au cores and provides a vacant cavity where chemical transformations take place on the Au cores in a controlled manner but also improves the activity and stability of Au cores due to the electrons delocalization and transfer from the Au d orbitals of the nanocores to the π-conjugated ligands of the PANI shell, as proved by the X-ray photoelectron spectroscopy results. The as-synthesized YSNs were found to perform as flexible and reusable heterogeneous catalysts with high catalytic efficiency for the aerobic oxidation of alcohol in aqueous solution. One may find the present study to be a general and effective way to fabricate monodispersed hollow nanomaterials in a controlled and green manner.

Optically active hollow nanoparticles constructed by chirally helical substituted polyacetylene

Hollow nanoparticles were constructed by chirally helical substituted polyacetylene and they demonstrated intriguing optical activity and high stability.

Magnetic Fe3O4 nanoparticles supporting Macmillan with controlled shell structure as an efficient and reusable catalyst for asymmetric reaction

Magnetic nanoparticles grafted with chiral polymer brushes offer an effective way to bridge the gap between heterogeneous and homogeneous catalysis.

Hydrophobization of silver nanoparticles through surface-initiated atom transfer radical polymerization

Poly(methyl methacrylate) (PMMA)-coated Ag@SiO₂core–shell particles with enhanced dispersibility in non-polar solvents were synthesized by surface-initiated atom transfer radical polymerization.

CO2-switchable drug release from magneto-polymeric nanohybrids

A CO₂-responsive well-defined magneto-polymeric drug delivery system has been developed. A dosage release of doxorubicin (DOX) in vitro in a time-controllable manner can be easily executed with alternate CO₂/N₂ treatment by these smart nanocarriers.

Palladium-loaded magnetic core–shell porous carbon nanospheres derived from a metal–organic framework as a recyclable catalyst

Pd-loaded magnetic porous carbon nanospheres (Fe₃O₄@MC-Pd) were prepared by annealing Fe₃O₄@MIL-100/PdCl₂, which was fabricated through a facile one-pot solvothermal method, at 450 °C in nitrogen atmosphere.

Fast magnetic-field-induced formation of one-dimensional structured chain-like materials via sintering of Fe3O4/poly(styrene-co-n-butyl acrylate-co-acrylic acid) hybrid microspheres

The facile and fast preparation of 1D hybrid microchains via magnetic-field-induced assembly assisted by sintering of Fe₃O₄/P(St-co-nBA-co-AA) hybrid microspheres is reported.

Preparation and characterization of magnetic nanocomposite catalysts with double Au nanoparticle layers

Nanocomposite catalysts, with single and double gold layers, and with one gold layer and one silver layer were prepared through simple steps, and showed excellent activity in the reduction of nitrophenols.

Gold-supported magnetically recyclable nanocatalysts: a sustainable solution for the reduction of 4-nitrophenol in water

Magnetic core-double shell silica nanosupports functionalized with amine and thiol groups successfully immobilized Au NPs, producing novel magnetically recyclable nanocatalysts for the reduction of 4-nitrophenol in water in the presence of NaBH₄.

In situ loading of gold nanoparticles on Fe3O4@SiO2 magnetic nanocomposites and their high catalytic activity

In this work, a facile approach was successfully developed for in situ catalyzing Au nanoparticles loaded on Fe3O4@SiO2 magnetic nanospheres via Sn(2+) linkage and reduction. After the Fe3O4@SiO2 MNPs were first prepared via a sol-gel process, only one step was needed to synthesize the Fe3O4@SiO2-Au magnetic nanocomposites (Fe3O4@SiO2-Au MNCs), so that both the synthesis step and the reaction cost were remarkably decreased. Significantly, the as-synthesized Fe3O4@SiO2-Au MNCs showed high performance in the catalytic reduction of 4-nitrophenol to 4-aminophenol and could be reused for several cycles with convenient magnetic separability. This approach provided a useful platform based on Fe3O4@SiO2 MNPs for the fabrication of Au or other noble metal magnetic nanocatalysts, which would be very useful in various catalytic reductions.

End Group Reactions of RAFT-Prepared (Co)Polymers

This review highlights the chemistry of thiocarbonylthio groups with an emphasis on chemistry conducted at ω or α and ω chain-ends in copolymers prepared by reversible addition–fragmentation chain-transfer (RAFT) radical polymerization. We begin by giving a general overview of reactions associated with the thiocarbonylthio groups, followed by examples associated with macromolecular thiols.