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Stimuli-responsive assembly of iron oxide nanoparticles into magnetic flexible filaments

Authors :
Grein-Iankovski, Aline
Graillot, Alain
Loh, Watson
Berret, Jean-Francois
Source :
Emergent Materials (2021)
Publication Year :
2021

Abstract

The combination of multiple functionalities in a single material is an appealing strategy for the de-velopment of smart materials with unique features. In this work, we present the preparation of thermoresponsive magnetic nanoparticles and their one-dimensional assembly into transient micro-filaments. The material is based on 9.4 nm iron oxide nanoparticles grafted with poly(N-n-propylacrylamide) via multiphosphonic acid anchoring sites. The hybrid nanoparticles present a low critical solution temperature (LCST) transition between 21 {\deg}C and 28 {\deg}C, depending on the pH and the ionic strength. When heated above the LCST in defined conditions, the nanoparticles ag-gregate and respond to an external magnetic field. An intrinsic characteristic of the thermorespon-sive particles is an asymmetric transition between cooling and heating cycles, that was favorably exploited to build one-dimensional permanent microstructures, such as magnetic microfilaments and cilia. In summary, we present the development of a nanoplatform responsive to multiple stimu-li, including temperature, magnetic field, pH and ionic strength and its transformation into magneti-cally active microfilaments that could find potential applications in remotely controlled devices.<br />Comment: 18 pages, 8 figures

Details

Database :
arXiv
Journal :
Emergent Materials (2021)
Publication Type :
Report
Accession number :
edsarx.2103.06837
Document Type :
Working Paper
Full Text :
https://doi.org/10.1007/s42247-021-00210-9