Shaping the Assembly of Superparamagnetic Nanoparticles

ACS Nano
Minghan HuHéloïse Thérien-Aubin

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, 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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Citations

Oct 5, 2019·Advanced Materials·Xiaoxuan ZhangYuanjin Zhao
Feb 6, 2020·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Juanrong QinBotao Song
Sep 25, 2020·Analytical and Bioanalytical Chemistry·Joanna KruszewskaMagdalena Matczuk
Sep 10, 2020·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Zequn ShenGuoying Gu
Jan 15, 2021·Nanoscale·Frederik Laust DurhuusCathrine Frandsen
May 25, 2021·Nanomedicine·Smriti Sharma, Vinayak Bhatia
Aug 23, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Qindan ZhangHuai Z Li

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