Abstract
Calcination of nanoparticles is always accompanied by undesired sintering. A calcination route preventing hard-agglomeration to bulk lumps, which is transferable to almost any kind of metal oxide nanoparticle, is developed by surrounding targeted nanoparticles by silica nanoparticles within a nanostructured microparticle. After calcination, the desired nanoparticles are regained as a monodisperse sol via silica dissolution.
Highlights
Calcination of nanoparticles is always accompanied by undesired sintering
A calcination route preventing hard-agglomeration to bulk lumps, which is transferable to almost any kind of metal oxide nanoparticle, is developed by surrounding targeted nanoparticles by silica nanoparticles within a nanostructured microparticle
Calcination is a heat treatment step which is indispensable for the synthesis or to unfold the desired physical properties of a vast variety of nanoparticles (NPs) including hydroxyapatite ceramics,[1] SnO2,2 CeO2,3 Cr2O3,4 TiO2,5 ZrO2,6 Co3O4,7 MgO8 and Y2O3.9 The calcination process is required to increase the amount of crystalline phase and to decrease crystal defects within the NPs.[2,6]
Summary
Calcination of nanoparticles is always accompanied by undesired sintering. A calcination route preventing hard-agglomeration to bulk lumps, which is transferable to almost any kind of metal oxide nanoparticle, is developed by surrounding targeted nanoparticles by silica nanoparticles within a nanostructured microparticle. It is well-known that calcination of NPs always comes with the unwanted side-effect of sintering, i.e., an increase of crystallite sizes and formation of hard-agglomerates.[2,3,5] This development of solid bridges between particles is aUniversity Wurzburg, Chair of Chemical Technology of Materials Synthesis, Rontgenring 11, 97070
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