Encapsulation of Pd sub-nanoclusters in SiO₂ nanospheres by a reverse microemulsion method

Abstract

Pd sub-nanoclusters (mean size 0.7[Formula: see text]nm) encapsulated in SiO2 nanospheres (mean size 37[Formula: see text]nm) with Pd@SiO2 core-shell configuration were synthesized using a reverse microemulsion method in a water/CTAB/n-butanol/cyclohexane system. The Pd sub-nanoclusters dispersed homogeneously throughout the SiO2 shell and the loading of Pd was as high as 4.03[Formula: see text]wt.%. The Pd sub-nanoclusters were successfully synthesized by controlling the nucleation and growth processes of Pd[Formula: see text]H2O precursor.

Recent Application of Core-Shell Nanostructured Catalysts for CO2 Thermocatalytic Conversion Processes

“…In general, impregnation of heterogeneous catalysts on supported metal oxides leads to the stochastic distribution of the size and spatial location of the active NPs within the catalyst volume [ 60 ]. Additionally, CSNs can be engineered via additional synthesis following hydrothermal [ 61 , 62 , 63 ] microemulsion [ 64 , 65 , 66 , 67 ], ball milling [ 68 , 69 ] or ion exchange [ 70 , 71 ] technique. Such additional synthesis steps are important to tailor the water-to-surfactant ratio, thus resulting in a small and narrow particle size distribution inside the shell cage.…”

Synthesis and Characterization of α-Fe2O3 Nanoparticles by Microemulsion Method

“…It is remarkable because of the water-in-oil / reverse microemulsion offers nanoparticle synthesis with narrow size distribution and controllable particle size (Shojaei et al, 2014;Foroughi et al, 2015;Strom et al, 2018). Thermodynamically stable dispersions, called reverse micelles, are composed of a continuous oil phase and a dispersed water droplet phase can be considered as true nanoreactors that can be used specifically to synthesize inorganic nanomaterials (Ye et al, 2018). In addition, reverse microemulsions exhibit self-assembly behaviour and this situation is very important for the synthesis of nanomaterials (Lai et al, 2019).…”