1,721,949 research outputs found
Assembly of an Au/Pd heterojuction nanocrystal inside the hollow silica nanoshell
No full textNone11Nsci
Mechanistic insight into yolk@shell transformation of MnO@silica nanosphere incorporating Ni2+ ions: Solid-state route toward colloidal nanoreactor system
No full textNone11Nsci
Fabrication of hollow nanoparticles with functionalized interior surface for the nanoreactor application
No full text11sci
Mechanistic Insight into the Yolk@Shell Transformation of MnO@Silica Nanospheres Incorporating Ni2+ Ions toward a Colloidal Hollow Nanoreactor
No full textAs an effort to develop a simple and versatile synthetic strategy that contributes to the evolution of hollow nanostructures with increasing complexity and functionality, this research is devoted to study the hollow transformation within a nanosized solid matrix. Through an in-depth investigation of a hollowing process of MnO nanocrystals confined within a Ni2+ incorporating silica nanosphere, a very distinct transformation pathway can be explained that produces the yolk@shell nanostructure with a single Ni nanocrystal inside a silicate nanoshell. The yolk@shell structure is developed by a mechanism combining different processes, including the formation of a (Ni0.1Mn0.9)O mixed-metal oxide and subsequent segregation of the reduced Ni. Furthermore, this study also devises a protocol to exploit the solid-state-synthesized powder for fabricating a colloidal hollow nanoreactor that can selectively catalyze the reduction of nitroarenes and be recycled via the magnetic process.X111612sciescopu
A seed-engineering approach toward a hollow nanoreactor suitable for the confined synthesis of less-noble Ni-based nanocrystals
No full textA hollow nanoreactor suitable for the cultivation of Ni-nanocrystals was developed through a distinct seed-engineering stratagem, which involved the assembly of a catalytically active Au/Pd-heterojunctionnanocrystal inside the hollow silica nanoshell. The resulting hollow nanoreactor demonstrated a targeted performance in the cavityconfined growth of the catalytic Ni nanocrystal.open111412sciescopu
Fabrication of Supported AuPt Alloy Nanocrystals with Enhanced Electrocatalytic Activity for Formic Acid Oxidation through Conversion Chemistry of Layer-Deposited Pt2+ on Au Nanocrystals
No full textThe exploitation of nanoconfined conversion of Au- and Pt-containing binary nanocrystals for developing a controllable synthesis of surfactant-free AuPt nanocrystals with enhanced formic acid oxidation (FAO) activity is reported, which can be stably and evenly immobilized on various support materials to diversify and optimize their electrocatalytic performance. In this study, an atomic layer of Pt2+ species is discovered to be spontaneously deposited in situ on the Au nanocrystal generated from a reverse-microemulsion solution. The resulting Au/Pt2+ nanocrystal thermally transforms into a reduced AuPt alloy nanocrystal during the subsequent solid-state conversion process within the SiO2 nanosphere. The alloy nanocrystals can be isolated from SiO2 in a surfactant-free form and then dispersedly loaded on the carbon sphere surface, allowing for the production of a supported electrocatalyst that exhibits much higher FAO activity than commercial Pt/C catalysts. Furthermore, by involving Fe3O4 nanocrystals in the conversion process, the AuPt alloy nanocrystals can be grown on the oxide surface, improving the durability of supported metal catalysts, and then uniformly loaded on a reduced graphene oxide (RGO) layer with high electroconductivity. This produces electrocatalytic AuPt/Fe3O4/RGO nanocomposites whose catalyst-oxide-graphene triple-junction structure provides improved electrocatalytic properties in terms of both activity and durability in catalyzing FAO.111814sciescopu
A magnetically separable gold catalyst for chemoselective reduction of nitro compounds
No full textMagnetically separable gold-nanoparticle catalyst was prepared, and it showed excellent activity for chemoselective reduction of nitroarenes with hydrosilanes.X114644sciescopu
Functionalization of hollow nanoparticles for nanoreactor applications
No full textThe hollow nanoparticles, which contain catalytic species inside the cavity enclosed by a porous nanoshell, are considered an ideal framework for the nanoreactor that efficiently catalyzes the transformation of the selectively transferred substrate molecules with little loss of activity and surface area of entrapped catalysts even in harsh reaction conditions or during the recycling process. In the performance of the hollow nanoreactor, the selectively functionalized interior cavity is the most vital component which allows chemical reactions to occur within the confines of the protected cavity. Therefore, selective and differential functionalization of the internal space of the hollow nanoshell is the important and challenging topic which is demanded for fully exploiting the potential of the hollow nanoparticle in the nanoreactor application. In this context, this review paper intends to make a survey on the synthetic strategies of functionalizing the interior cavity of the hollow nanoparticles and their employment as nanoreator systems which catalyze the chemical reactions and template the growth of nanocrystals. (C) 2014 Elsevier Ltd. All rights reserved.X117252sciescopu
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