Magnetic properties, responsiveness, and stability of paramagnetic dumbbell and ellipsoid colloids
Magnetic properties, responsiveness, and stability of paramagnetic dumbbell and ellipsoid colloids
复制标题
顺磁性哑铃和椭球胶体的磁性、响应性和稳定性
DOI：
10.1016/j.jcis.2020.01.061
复制
发表时间：
2020
影响因子：
9.9
通讯作者：
Furst, Eric M.
中科院分区：
文献类型：
--
作者：
Kim, Hojin;Furst, Eric M.
采用逐层法合成顺磁性金属/聚合物多层胶体颗粒。利用各种形状的聚合物胶体合成和逐层组装的最新进展，可以制备出具有不同长宽比和瓣间不对称性的超顺磁哑铃胶体。我们通过磁力测定来表征磁性纳米颗粒在各向异性主体颗粒上的表面覆盖度以及颗粒的磁响应。合成的颗粒是胶体稳定的，但在磁场中，通过诱导相互作用形成持久的微观结构。这些柱状微观结构是可逆的，并且很容易通过布朗运动而分散。合成过程中磁性纳米颗粒的浓度提供了控制复合纳米颗粒的磁响应的方法。该方法扩展到长径比在 3.4 至 4.2 之间的长椭球纳米颗粒。
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.