Bottom-up design of hydrogels through click-chemistry modification of magnetic nanoparticles

Ilaria Meazzini, Massimo Bonini, Francesca Ridi*, Piero Baglioni

Department of Chemistry “Ugo Schiff” & CSGI, University of Florence, via della Lastruccia 3, Sesto Fiorentino (FI), 50019, Italy

DOI: 10.5185/amlett.2018.2214

Publication Date (Web): Oct 26, 2018

E-mail: francesca.ridi@unifi.it

Abstract

The paper describes a modular approach based on click chemistry for the surface modification of magnetic oxide nanoparticles and their covalent inclusion within chemical hydrogels. As a proof of concept, we prepared cobalt ferrite nanoparticles and we modified their surfaces through the reaction with molecules bearing a carboxylic function and, alternatively, either an azide or an alkyne moiety. In the second step, the modified nanoparticles were reacted through a Huisgen 1,3-dipolar cycloaddition with a molecule bearing an unsaturated function and either an alkyne or an azide moiety, respectively. Finally, the particles were successfully copolymerized with acrylamide and N,N'-methylenebisacrylamide to obtain a magnetically responsive hydrogel. This approach could be easily extended towards any type of inorganic oxide nanoparticles and their inclusion within any radically co-polymerized hydrogel. 

Keywords

Polymeric nanocomposite, magnetic nanoparticles, click-chemistry, polyacrylamide gel, responsive materials.

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