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Preparation of Hierarchical SnO 2 Microspheres with Controlled Size from Ion Exchange Resins
Author(s) -
Aiube Carlos M.,
de Melo Lennine R.,
de Macedo Julio L.
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201701426
Subject(s) - calcination , materials science , tetragonal crystal system , crystallization , particle size , chemical engineering , nanocrystal , microsphere , crystal structure , rutile , cationic polymerization , ion exchange , particle (ecology) , phase (matter) , oxide , specific surface area , nanomaterials , nanotechnology , mineralogy , ion , catalysis , crystallography , chemistry , polymer chemistry , metallurgy , organic chemistry , oceanography , geology , engineering
SnO 2 microspheres were prepared by an ion exchange technique using a cationic resin as template. The material obtained by calcination was investigated by several techniques and showed singular properties. Removal of the polymeric matrix led to hierarchical layers of hollow SnO 2 microspheres with mean particle size of 43 μm and surface area of 27.8 m 2 g −1 . The Matryoshka ‐like structure showed 3 to 5 stacked shells that were comprised by aggregated nanocrystals of 19.6 nm as building blocks. The crystallization into more shells was a unique feature of SnO 2 and was attributed to the chemical nature of this oxide. The rutile tetragonal phase obtained showed the presence of crystal defects attributed to the macrotemplating method employed. The SnO 2 multi‐shelled morphology reported in this work was obtained by a facile template method followed by calcination, which might be essential in the development of new synthetic routes for the manufacture of micro‐structured materials.