title: Mechanistic Insight into the Yolk@Shell Transformation of MnO@Silica Nanospheres Incorporating Ni(2+) Ions toward a Colloidal Hollow Nanoreactor.
abstract: As 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 Ni(2+) 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 (Ni0.1 Mn0.9 )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.
authors.affiliation: Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, 790-784, Korea.
authors.forename: Jin Goo
authors.initials: JG
authors.lastname: Kim
authors.forename: Soo Min
authors.initials: SM
authors.lastname: Kim
authors.forename: In Su
authors.initials: IS
authors.lastname: Lee
keywords: hollow nanoparticles; nanoparticles; nanoreactors; nanostructures; solid-state reactions