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Facile synthesis of titania-encapsulated magnetites with controlled magnetism and surface morphology
Authors:Sung-Eun Kim  Sang-Wha Lee
Affiliation:1. Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45137-66731, Iran;2. Center of Climate Change and Global Warming, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45137-66731, Iran;1. Department of Physics and Energy Harvest-storage Research Center, University of Ulsan, Ulsan 680-749, South Korea;2. Department of Chemical Engineering, University of Ulsan, Ulsan 680-749, South Korea;1. Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Russia;2. Karlsruher Institut für Technologie, Institut für Nanotechnologie, Eggenstein-Leopoldshafen, Germany;3. National University of Science and Technology «MISIS», Moscow, Russia;4. Moscow Technological University (MIREA), 78 Vernadsky Avenue, 119454 Moscow, Russia;1. Nanomaterials Group, Materials Engineering Department, Tarbiat Modares University, Tehran, P.O.Box:14115-111, Iran;2. Polymer Group, Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran;3. Center of Environmental Implications of Nanotechnology (CEINT), Duke University, Durham, USA;1. Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45137-66731, Iran;2. Center of Climate Change and Global Warming, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45137-66731, Iran;3. Fachbereich Chemie and Wissenschaftliches Zentrum für Materialwissenschaften (WZMW), Philipps-Universität Marburg, Hans-Meerwein-Straße, D-35032, Marburg, Germany
Abstract:Titania-encapsulated magnetites (A-Fe3O4@TiO2) were facilely fabricated through the modified sol–gel reaction of APTMS-complexed Fe3O4 (A-Fe3O4) with tetraethyl orthotitanate (TEOT). The magnetism and surface morphology of A-Fe3O4@TiO2 were controlled by adjusting the thickness of titania capsule layer. A-Fe3O4@TiO2 exhibited the superparamagnetic characteristics of negligible remanence and coercity. Thermal analysis of A-Fe3O4@TiO2 showed that the amorphous titania was transformed into crystalline phase at around 440 °C. The core–shell magnetite–titanium nanocomposites can be an attractive candidate for recyclable photocatalysts with magnetite core and/or active Fe3O4 electrode materials with buffering TiO2 capsules.
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