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Layer‐By‐Layer Assembly of Core‐Shell Magnetite Nanoparticles: Effect of Silica Coating on Interparticle Interactions and Magnetic Properties
Author(s) -
Aliev Farkhad G.,
CorreaDuarte Miguel A.,
Mamedov Arif,
Ostrander John W.,
Giersig Michael,
LizMarzán Lius M.,
Kotov Nicholas A.
Publication year - 1999
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/(sici)1521-4095(199908)11:12<1006::aid-adma1006>3.0.co;2-2
Subject(s) - materials science , superparamagnetism , layer (electronics) , nanoparticle , coating , magnetite , adhesion , layer by layer , magnetic nanoparticles , nanotechnology , deposition (geology) , shell (structure) , chemical engineering , magnetization , composite material , metallurgy , magnetic field , paleontology , physics , engineering , quantum mechanics , sediment , biology
Layered magnetic materials have been prepared using layer‐by‐layer deposition , a technique that allows engineering of the structure of individual particles while remaining simple to carry out. Organic–inorganic sandwich films of superparamagnetic Fe 3 O 4 thus prepared consisted of densely packed assemblies of Fe 3 O 4 nanocrystallites that showed good adhesion to a variety of substrates and excellent mechanical properties. Coating the nanoparticles with a shell of SiO 2 was found to greatly reduce the cooperative magnetization switching between adjacent nanoparticles.