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Tunable clustering of magnetic nanoparticles in microgels: enhanced magnetic relaxivity by modulation of network architecture

机译：可调集群的磁性纳米颗粒微凝胶:增强磁relaxivity调制的网络体系结构

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摘要

In the present work we used microgels as colloidal containers for the loading of hydrophobic magnetic nanoparticles using the solvent exchange method. We varied systematically two parameters: (i) the cross-linking degree of microgels (1-4.5 mol% crosslinker) and (ii) loading of hydrophobic magnetite nanoparticles (d = 7 nm) in microgels (2-10 wt%). The experimental data show that the interplay between these two parameters provides efficient control over the clustering of magnetic nanoparticles in the microgel structure. Transverse magnetization relaxation measurements indicate that the formation of nanoparticle clusters in microgels induces non-linear enhancement of the relaxivity with the increase of nanoparticle loading in microgels. The results suggest that the modulation of the microgel network architecture can be efficiently applied to trigger self-assembly processes inside microgels and design hybrid colloids with unusual morphologies and properties.
机译：在目前的工作我们使用微凝胶作为胶体集装箱装载的疏水性磁性纳米粒子使用溶剂交换方法。(我)微凝胶的交联程度(1 - 4.5摩尔%交联剂)和(2)加载的疏水性磁铁矿纳米颗粒在微凝胶(d = 7海里)(2 - 10 wt %)。这两个参数之间的相互作用高效的磁控制集群纳米颗粒的微凝胶结构。横向磁化弛豫测量表明纳米粒子的形成集群在微凝胶诱导非线性增强relaxivity的增加在微凝胶纳米粒子加载。表明微凝胶的调制网络体系结构可以有效地应用引发自组装过程微凝胶和设计混合胶体与不同寻常形态和属性。

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