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Wiley, Angewandte Chemie International Edition, 6(54), p. 1803-1807, 2014

DOI: 10.1002/anie.201409878

Wiley, Angewandte Chemie, 6(127), p. 1823-1827, 2014

DOI: 10.1002/ange.201409878

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Tuning the Colloidal Crystal Structure of Magnetic Particles by External Field

Journal article published in 2014 by Antara Pal ORCID, Vikash Malik, Le He, Ben H. Erné, Yadong Yin ORCID, Willem K. Kegel, Andrei V. Petukhov ORCID
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This paper is available in a repository.

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Abstract

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.