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Tuning the Colloidal Crystal Structure of Magnetic Particles by External Field
Author(s) -
Pal Antara,
Malik Vikash,
He Le,
Erné Ben H.,
Yin Yadong,
Kegel Willem K.,
Petukhov Andrei V.
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201409878
Subject(s) - tetragonal crystal system , magnetite , materials science , colloid , crystallization , magnetic field , colloidal crystal , self assembly , nanotechnology , magnetic nanoparticles , nanoparticle , chemical physics , crystal structure , scattering , hexagonal crystal system , field (mathematics) , crystallography , chemical engineering , chemistry , optics , physics , quantum mechanics , engineering , metallurgy , mathematics , pure mathematics
Manipulation of the self‐assembly of magnetic colloidal particles by an externally applied magnetic field paves a way toward developing novel stimuli responsive photonic structures. Using microradian X‐ray scattering technique we have investigated the different crystal structures exhibited by self‐assembly of core–shell magnetite/silica nanoparticles. An external magnetic field was employed to tune the colloidal crystallization. We find that the equilibrium structure in absence of the field is random hexagonal close‐packed (RHCP) one. External field drives the self‐assembly toward a body‐centered tetragonal (BCT) structure. Our findings are in good agreement with simulation results on the assembly of these particles.