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.
| Original language | English |
|---|---|
| Pages (from-to) | 1803-1807 |
| Number of pages | 5 |
| Journal | Angewandte Chemie-International Edition |
| Volume | 54 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2 Feb 2015 |
Funding
A.P. thanks The Netherlands Organization for Scientific Research (NWO; 700.10.355), V.M. thanks the Swiss National Science Foundation (SNF) for financial support (PBFRP2-134284), Y.Y. thanks for financial support from the U.S. National Science Foundation (DMR-0956081). The personnel of the DUBBLE beamline are thanked for their help with the synchrotron experiment, and NWO is thanked for granting beamtime.
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