| 초록 |
Herein, we report on a simple and robust route to the spontaneous assemblies of magnetic nanoparticles into well-ordered structures by irreversible evaporation of a mixture of a ferrofluid and non-ferrofluid. The resulting assembled structures produced well-packed, vertically arranged columns with diameter of 5-0.7 μm, interparticle spacing of 9-2 μm, and height of 1.3–3 μm. These structures were observed to be strongly dependent upon both the magnitude of magnetic field and mixing ratio of the mixture. As an externally applied magnetic field and the mixing ratio of the mixture increased gradually, the size and interspacing of magnetic nanoparticles aggregations decreased. Without a magnetic field, featureless patterns of the γ-Fe3O4 nanoparticles aggregations were observed. The proposed approach may open a versatile, cost-effective, fast, and scalable route to the fabrication process based on the field–induced self-assembly of magnetic nanoparticles. |
