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Preparation and Properties of Metal Oxide Hollow and Yolk-shell Nanostructures

Author: ZhangXueQing
Tutor: WangChunGang
School: Northeast Normal University
Course: Physical and chemical
Keywords: SPIO@SnO2 yolk-shell nanocapsules hollow nanaparticles catalyst reusability
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Type: Master's thesis
Year: 2013
Downloads: 52
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Abstract


The yolk-shell structured nanoparticles a special kind of the core-shell nanostructures possessing a movable functional core and different shell. There is a gap between the movable core and the shell, which forms the hollow structure. The size of the inner cavity can be tuned, which endows yolk-shell structured nanoparticles with new features so that yolk-shell nanomaterials have aroused wide research interest in the field of catalysis and nano-medicine. The hollow nanoparticles are another special structure of the core-shell nanostructures with empty cores, which have a large specific surface area, low density and good permeability surface and so on, and has broad prospects for applications in many high-tech fields.This thesis presents a simple way to prepare hollow SnO2and CeO2nanoparticles using SiO2as a template. The resulting hollow SnO2and CeO2nanoparticles are uniform in size and well dispersed. Additionally, the properties of nanoparticles were characterized. This facile method was also used to synthesize monodisperse and uniform superparamagetic iron oxide (SPIO)@SnO2yolk-shell nanocapsules. Furthermore, the inner size of the nanocapsules is controllable. The possible formation mechanism of SPIO@SnO2yolk-shell nanocapsules was discussed. The resulting SPIO@SnO2yolk-shell nanocapsules present excellent photocatalytic degradation of rhodamine B (RhB) and can be reused up to five times by magnetic separation, which have a potential application in environmental protection. Characterization methods used in this article include transmission electron microscopy (TEM), scanning electron microscopy (SEM), UV-visible spectrophotometer (UV-Vis) and so on.

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