Magnetic properties, responsiveness, and stability of paramagnetic dumbbell and ellipsoid colloids.,Journal of Colloid and Interface Science

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Magnetic properties, responsiveness, and stability of paramagnetic dumbbell and ellipsoid colloids.
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-01-20 , DOI: 10.1016/j.jcis.2020.01.061
Hojin Kim ₁ , Eric M Furst ₁

Affiliation

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.

中文翻译：

顺磁性哑铃和椭球胶体的磁性，响应性和稳定性。

使用逐层方法合成顺磁性金属/聚合物多层胶体颗粒。通过利用合成具有各种形状和逐层组装的聚合物胶体的最新进展，制造了具有不同长宽比和瓣之间不对称性的超顺磁性哑铃胶体。我们表征了磁性纳米粒子在各向异性主体粒子上的表面覆盖率，并通过磁力分析法表征了粒子的磁响应。合成的颗粒是胶体稳定的，但是在磁场中通过诱导的相互作用形成持久的微观结构。这些柱状的微结构是可逆的，并且易于通过布朗运动分散。合成期间的磁性纳米粒子浓度提供了控制复合纳米粒子的磁响应的手段。该方法扩展到长宽比在3.4和4.2之间的椭球形纳米颗粒。

更新日期：2020-01-21

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