Shaping the Assembly of Superparamagnetic Nanoparticles

  • Minghan Hu (4523746)
  • Hans-Jürgen Butt (1404694)
  • Katharina Landfester (350973)
  • Markus B. Bannwarth (1631752)
  • Sanghyuk Wooh (1473862)
  • Héloïse Thérien-Aubin (1554124)
Publication date
April 2019
Publisher
American Chemical Society (ACS)

Abstract

Superparamagnetism exists only in nanocrystals, and to endow micro/macro-materials with superparamagnetism, 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 supraparticles by drying ferrofluid droplets on a superamphiphobic 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...

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