Magnetic properties, responsiveness, and stability of paramagnetic dumbbell and ellipsoid colloids

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:566

Article

Kim, Hojin¹  Furst, Eric M.¹ 

[1] Univ Delaware, Dept Chem & Biomol Engn, Allan P Colburn Lab, Newark, DE 19716 USA

关键词: Magnetic particle;    Layer-by-layer;    Anisotropic particle;    Directed self-assembly;    Superparamagnetic;   

DOI  :  10.1016/j.jcis.2020.01.061

来源: Elsevier

【 摘 要 】

A layer-by-layer method is used to synthesize paramagnetic metal/polymer multi-layered colloidal particles. By taking advantage of recent advances in the synthesis of polymer colloids with various shapes and layer-by-layer assembly, superparamagnetic dumbbell colloids are fabricated with different aspect ratios and asymmetries between lobes. We characterize the surface coverage of magnetic nanoparticles on the anisotropic host particles and the magnetic response of the particles by magnetometry. The synthesized particles are colloidally stable, but in a magnetic field, form persistent microstructures through induced interactions. These column-like microstructures are reversible and readily disperse by Brownian motion. The magnetic nanoparticle concentration during synthesis provides a means to control the magnetic response of the composite nanoparticle. The method is extended to prolate ellipsoid nanoparticles with aspect ratios between 3.4 and 4.2. (C) 2020 Elsevier Inc. All rights reserved.

【 授权许可】

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