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Evaluation of Color and Structure of α-Fe2O3 Nanocapsules by Tuning of the SiO2 Morphology

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In this study, we synthesized a core/yolk–shell α-Fe2O3@SiO2 structure by treatment of SiO2 shell with mild basic solution. Spindle shaped α-Fe2O3 nanoparticles were initially prepared as core materials and subsequently coated with silica via sol–gel method. The yolk shell of α-Fe2O3 was produced by dissolution of silica shell from core–shell type hematite in NH4OH solution. In addition, the correlation between the density and morphology of the silica coating layer and the chromaticity according to the NH4OH concentration and the etching time was confirmed. We found that, after the conversion, the spindle shapes of the composite colloids were retained for both the hematite core and the silica shell, but the physical properties had a median value.
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Keywords: Etching; NH4OH; SiO2; α-Fe2O3

Document Type: Research Article

Affiliations: 1: Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology, Icheon 17303, South Korea 2: Ceramicware Center, Korea Institute of Ceramic Engineering and Technology, Icheon 17303, South Korea

Publication date: 01 September 2018

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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