期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 6, 页码 1803-1807出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201409878
关键词
colloidal crystals; core-shell nanoparticles; magnetic field; self-assembly; X-ray scattering
资金
- Netherlands Organization for Scientific Research (NWO) [700.10.355]
- Swiss National Science Foundation (SNF) [PBFRP2-134284]
- U.S. National Science Foundation [DMR-0956081]
- Swiss National Science Foundation (SNF) [PBFRP2-134284] Funding Source: Swiss National Science Foundation (SNF)
- Direct For Mathematical & Physical Scien [0956081] Funding Source: National Science Foundation
- Division Of Materials Research [0956081] Funding Source: National Science Foundation
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.
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