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Single‐Step Nanoengineering of Silica Coated Maghemite Hollow Spheres with Tunable Magnetic Properties
Author(s) -
Tartaj P.,
GonzálezCarreño T.,
Serna C. J.
Publication year - 2001
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/1521-4095(200111)13:21<1620::aid-adma1620>3.0.co;2-z
Subject(s) - maghemite , materials science , spheres , nanoengineering , layer (electronics) , chemical engineering , pyrolysis , nanotechnology , magnetic nanoparticles , yield (engineering) , composite material , nanoparticle , physics , astronomy , engineering
Tunable magnetic hollow spheres of γ‐Fe 2 O 3 with a silica‐enriched surface layer have been synthesized by aerosol pyrolysis of an iron ammonium citrate/TEOS solution in methanol. Careful temperature control is crucial for an optimum yield of intact spheres. The Figure shows a TEM image of a sphere, revealing the outer layer consisting mainly of silica. The material is potentially interesting for magnetic‐fluid applications, e.g., in medicine.