Rattle-type microspheres as a support of tiny gold nanoparticles for highly efficient catalysis

Abstract

SiO(2)/poly(ethyleneglycol dimethacrylate) (PEGDMA) rattle-type microspheres loaded with tiny sized gold nanoparticles (~2 nm) were prepared through a facile and novel method. Catalyzed reduction of 4-nitrophenol with NaBH(4) demonstrated that this rattle-type microsphere possessed high catalytic efficiency.

A facile approach to the fabrication of rattle-type magnetic carbon nanospheres for removal of methylene blue in water

“…S10) [66], the rattle-type Fe 3 O 4 @C composite exhibited more rapid reaction kinetics for MB degradation, completely degrading MB within 3 h. The increased catalytic reactivity of Fe 3 O 4 @C compared with Fe 3 O 4 is likely due to the nanoreactor feature of the rattle-type structure, including the large free reaction voids inside the carbon sphere, the highly dispersed core nanoparticle in each capsule, and the high porosity of the carbon shell derived from RF [23,27,67,68]. It is also possible that the carbon shell prevents aggregation of the magnetic nanoparticles, which can dramatically decrease the catalytic activity [10]. To study the effect of the initial dye concentration on the decolorization efficiency, experiments were carried out with different concentrations of MB (Fig.…”

“…In this study, Fe 3 O 4 molecules were encapsulated in carbon capsules to form a nanoreactor. This strategy not only protects the Fe 3 O 4 nanoparticles from aggregation but can also protect Fe 3 O 4 from acid corrosion, which greatly extend their range of potential use [10]. Most importantly, the Fe 3 O 4 @C hybrid nanorattles provide a unique nanoreactor system for spatially confined catalytic reactions, which is assumed to contribute to the excellent catalytic performance.…”

“…The void space within the shell provides a unique space for the core material in confined catalysis [2,3], drug release [4,5], nanoscale reactors [6,7], and lithium-ion batteries [8,9]. The core can endow different functionalities to this type of material, while the shell can protect the core from aggregation and leakage, which can significantly reduce the catalytic efficiency [10].…”

A double-shelled yolk-like structure as an ideal magnetic support of tiny gold nanoparticles for nitrophenol reduction

“…4 For instance, Yang reported SiO 2 @poly(ethyleneglycol dimethacrylate) yolk-shell microspheres loaded with small gold nanoparticles in the void space which exhibited high catalytic efficiency for reduction of 4-nitrophenol. 5 Qiao and coworkers demonstrated yolk-shell nanoparticles consisting of a silica core and an outer organosilica shell with metal nanoparticles encapsulated in the interstice between the core and the shell for selective oxidation of alcohol. 6 Although some progress in the preparation of a small metal nanoparticle loaded yolkshell catalyst has been achieved, the materials obtained previously are mostly composed of a single-layer shell, which presents low compositional diversity and less functionality.…”

Observation and Characterization of the Surface Plasmon Resonances of Platinum Nanoshells

“…For the transformation of platinum seeds into platinum shells, 4.0 mL of 2 days-aged 10 mM H 2 PtCl 6 (aq) and 2.0 mL of the above mixture were mixed, stirred for 1 h, added with 0.32 mL of 100 mM L-ascorbic acid(aq), and stirred for 1 h. 30 Finally, 10.0 mL of HF(aq) and 1.0 mL of the above colloid were mixed and stirred for 2 min. 31 The produced hollow platinum nanospheres were centrifuged at 10,000 rpm for 10 min and redispersed in 1.0 mL of ethanol three times.…”