A Facile Strategy to Fabricate Polysaccharide‐Based Magnetic Hydrogel Based on Enamine Bond^†

Abstract

of main observation and conclusion Magnetic hydrogels have found extensive applications in fields such as soft robotics, drug delivery and shape morphing. Here a facile method was fabricated to prepare polysaccharide-based magnetic hydrogels. The chitosan-Fe3O4 ferrofluid was obtained by dispersing carboxyl groups modified Fe3O4 nanoparticles uniformly in chitosan matrix. Subsequently, the magnetic polysaccharide hydrogel was obtained by simply mixing cellulose acetoacetate solution with chitosan-Fe3O4 ferrofluid. The structures and properties of the magnetic hydrogel were analyzed using Fourier-transform infrared spectroscopy, rheological recovery, responsiveness, and stability measurements. The results indicated that magnetic polysaccharide hydrogel showed pH responsiveness and excellent self-healing properties, and the hydrogel manifested outstanding stability under physiological conditions (37 °C) for 72 h. In addition, the injectable polysaccharide-based hydrogel exhibited sensitive magnetic responsive and shape-shifting ability under an external magnetic field. Therefore, the strategy for the facile preparation of the magnetic polysaccharide-based hydrogel in this work could provide a benign and versatile method for achieving self-healing, responsive, injectable properties for the application in biomedical fields.

Multi‐functional magnetic hydrogel: Design strategies and applications

“…The difference is that the former focuses on the modification of MNPs (Fe 3 O 4 , MnFe 2 O 4 , etc. ), mainly including increasing functional groups (e.g., carboxylic groups), [12] chemical loading, [13] coating (e.g., tannic acid), [14] etc. While the latter usually selects specific hydrogel components with a large number of active functional groups (carboxyl, hydroxyl, etc.…”

Three‐Dimensional Hierarchical Ternary Nanostructures Bismuth/Polypyrrole/CNTs for High Performance Potassium‐Ion Battery Anodes

“…For example, a three‐ dimensional porous framework can increase ion movement rate and improve three‐dimensional interconnection. [ 39‐45 ] Liu et al . [ 46 ] synthesized ternary hierarchical silicon electrode by chemical polymerization method and applied it to the lithium‐ion battery.…”

Physically Switchable Antimicrobial Surfaces and Coatings: General Concept and Recent Achievements

“…Such magneto-responsive coatings can be easily realized through matrix coating doped with magnetic nanoparticles. Simpler and scalable techniques, such as in situ crystallization and freeze-drying, co-precipitation, molding, and solvent-casting techniques [115][116][117][118][119] provide an elegant strategy for the creation of smart, magneto-activated coatings. Subsequent utilization of the external magnetic field results in significant surface morphology changing, providing an opportunity to create and switch proteins adhesivity or recreate dynamically cell-repellent surfaces.…”