Journal
ACS NANO
Volume 13, Issue 3, Pages 3015-3022Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b07783
Keywords
evaporation-guided self-assembly; superparamagnetic nanoparticles; superamphiphobic surfaces; supraparticles; anisotropic microparticles
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Funding
- Max Planck Center for Complex Fluid Dynamics
- China Scholarship Council
- National Research Foundation of Korea [NRF-2019R1C1C1007560]
- Alexander von Humboldt foundation
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Superparamagnetism exists only in nano-crystals, and to endow micro/macro-materials with super-paramagnetism, superparamagnetic nanoparticles have to be assembled into complex materials. Most techniques currently used to produce such assemblies are inefficient in terms of time and material. Herein, we used evaporation-guided assembly to produce superparamagnetic supra-articles by drying ferrofluid droplets on a super-amphiphobic substrate in the presence of an external magnetic field. By tuning the concentration of ferrofluid droplets and controlling the magnetic field, barrel-like, cone-like, and two-tower-like supraparticles were obtained. These assembled supraparticles preserved the superparamagnetism of the original nanoparticles. Moreover, other colloids can easily be integrated into the ferrofluid suspension to produce, by co-assembly, anisotropic binary supraparticles with additional functions. Additionally, the magnetic and anisotropic nature of the resulting supraparticles was harnessed to prepare magnetically actuable microswimmers.
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