The synthesis of silica and silica–ceria, core–shell nanoparticles in a water-in-oil (W/O) microemulsion composed of heptane and water with the binary surfactants AOT and NP-5

New Trends on the Synthesis of Inorganic Nanoparticles Using Microemulsions as Confined Reaction Media

“…Fewer examples deal with the formation of core-shell nanoparticles in which both the core and the shell have been synthesized in a W/O microemulsion (Chung et al, 2011;Takenaka et al, 2007). Takenaka et al prepared Ni nanoparticles in a W/O microemulsion, and afterwards TEOS and ammonia were added in order to form the silica layer.…”

“…Their catalytic activity in the partial oxidation of methane reaction was evaluated, and the core-shell nanoparticles had a better performance than the impregnated ones (Takenaka et al, 2007). On the other hand, Chung et al prepared silica nanoparticles coated with a thin layer of CeO 2 , and the material was also prepared in W/O microemulsions in a two-step procedure (Chung et al, 2011). This reaction turned out to be challenging as the formation of CeO 2 shell was competing with bulk precipitation.…”

Preparation, characterization, and luminescence properties of dysprosium perchlorate with MABA-Si and phen or dipy complexes as well as SiO2@Dy(MABA-Si)L core-shell structure nanometermeter luminescent composites

“…In brackets as the calculating value Fig.3 The SEM (L) and TEM(R) photographs of 400nm SiO 2 Fig.4 The TEM photographs of core-shell structures SiO 2(400) @ Dy(MABA-Si).dipy (20) Fig. 5 The TEM photographs of core-shell structures SiO 2(400) @ Dy(MABA-Si).phen (20) Fig.6 EDX spectrum of core-shell structures SiO 2(400) @ Dy(MABA-Si). (phen) (20) Fig.7 The formation mechanism of core-shell structures SiO 2 @ Dy(MABA-Si).phen …”

Synthesis of Engineered Zeolitic Materials: From Classical Zeolites to Hierarchical Core–Shell Materials

“…In addition, an enhanced catalytic performance, i.e., activity, was also observed . A wide variety of materials were used as shells, including silica, zirconia, titania, ceria, iron oxide, and carbon . However, most of these core@shell materials were unable to provide a true shape selectivity .…”