Polymer-Modified Cellulose Nanofibrils Cross-Linked with Cobalt Iron Oxide Nanoparticles as a Gel Ink for 3D Printing Objects with Magnetic and Electrochemical Properties

This paper presents a strategy to convert hydrophilic cellulose nanofibrils (CNF) into highly cross-linked hydrophobic network with inorganic nanoparticles develop gel ink suitable for 3D printing. The CNF were chemically modified initially through single-electron transfer-living radical polymerization (SET-LRP) of stearyl acrylate (SA) in the presence surface-modified cobalt iron oxide (CoFe2O4, CFO) nanoparticles. CFO provide their multifunctional properties, such as magnetic and electrochemical, hybrid and, at same time, act cross-linking agents between nanocellulose fibrils, while grafted poly-stearyl (PSA) introduces strong hydrophobicity network. A form this CNF–PSA–CFO material printing was achieved together certain solvent. Some test structure prints directly obtained used evaluate consolidation objects solvent exchange freeze-drying also keeping electrochemical properties CNF-based composite intact. pristine particles characterized by FTIR, SEM, XPS, TGA, VSM, CV measurements.