Polymer-Fe<sub>3</sub>O<sub>4</sub> Composite Janus\nNanoparticles
Xiaohui Yao (3383204)Jingyun Jing (3383207)Fuxin Liang (1406620)Zhenzhong Yang (1406635)
Abstract
A Fe<sub>3</sub>O<sub>4</sub> nanoparticle\n(NP) based on composite Janus NP with single polymer chain is prepared\nby termination of the modified Fe<sub>3</sub>O<sub>4</sub> NP with\nthe anionic living polymer chain. The requisite that the polymer chain\nshould be sufficiently large over the NP diameter determines the grafting\nof single polymer chain. From the opposite side of the NP surface,\nfunctional species can be selectively grown for example grafting responsive\nPNIPAM by ATRP. Besides simple combination of the thermal and magnetic\nresponsive performances of different components, the PS–Fe<sub>3</sub>O<sub>4</sub>–PNIPAM composite Janus NP shows additional\ninteractive performance such as NIR-triggered Janus/hydrophobic transition\nat low surrounding temperature below LCST ∼ 32 °C.
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