Tuning the Colloidal Crystal Structure of Magnetic Particles by External Field
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Publication date
2015-02-02
Authors
Pal, Antara
Malik, Vikash
He, Le
Erne, Ben
Yin, Yadong
Kegel, Willem
Petoukhov, Andrei
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Article
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taverne
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.
Keywords
colloidal crystals, core-shell nanoparticles, magnetic field, self-assembly, X-ray scattering, PHOTONIC CRYSTALS, HARD-SPHERE, SINGLE-CRYSTALS, NANOPARTICLES, LEVITATION, DELIVERY, DIPOLAR, CHAINS, CRYSTALLIZATION, DISPERSIONS, Taverne
Citation
Pal, A, Malik, V, He, L, Erne, B H, Yin, Y, Kegel, W K & Petukhov, A V 2015, 'Tuning the Colloidal Crystal Structure of Magnetic Particles by External Field', Angewandte Chemie-International Edition, vol. 54, no. 6, pp. 1803-1807. https://doi.org/10.1002/anie.201409878