White Magnetic Paper with Zero Remanence Based on Electrospun Cellulose Microfibers Doped with Iron Oxide Nanoparticles

Abstract

The preparation procedure of zero magnetic remanence superparamagnetic white paper by means of three-layer membrane configuration (sandwiched structure) is presented. The cellulose acetate fibrous membranes were prepared by electrospinning. The middle membrane layer was magnetically loaded by impregnation with an aqueous ferrofluid of 8 nm magnetic iron oxide nanoparticles colloidally stabilized with a double layer of oleic acid. The nanoparticles show zero magnetic remanence due to their very small diameters and their soft magnetic properties. Changing the ferrofluid magnetic nanoparticle volume fraction, white papers with zero magnetic remanence and tunable saturation magnetization in the range of 0.5–3.5 emu/g were prepared. The dark coloring of the paper owing to the presence of the black magnetite nanoparticles was concealed by the external layers of pristine white cellulose acetate electrospun fibrous membranes.

Superparamagnetic polyvinylpyrrolidone/chitosan/Fe3O4 electrospun nanofibers as effective U(VI) adsorbents

“…Upon magnetization, the color of the membrane was changed from white to light brown (Figure 1), indicating the successful attachment of the OA.OA.Fe 3 O 4 NPs onto the fibers' surfaces. A similar post‐magnetization approach involving the use of OA.OA.Fe 3 O 4 NPs, was recently employed by our group for the generation of white superparamagnetic paper 64 and magnetoactive collagen hydrogels 65 …”

A Facile Nanoimpregnation Method for Preparing Paper‐Based Sensors and Actuators

“…For the magnetic impregnation process, a wide range of magnetic fillers have been considered to provide magnetic properties to paper: bare nanoparticles, organic capped nanoparticles, single core–(oxide) shell particles, multicore–(oxide)shell particles, and fibers. [ 20–22 ]…”

“…Despite the low price, low toxicity, good mechanical properties, and high magnetization saturation of cobalt ferrite [ 1,23 ] —CoFe 2 O 4 (≈60 emu g –1 ), its high coercivity (higher than ≈ 200 Oe) is an important restrictive factor in certain applications like electromagnetic shielding, magnetic filtering, actuators or security papers. [ 20,24 ] Fe 3 O 4 can be a solution for a successful magnetic impregnation process due to its biocompatibility, low toxicity in human body, and stable room‐temperature superparamagnetic response. [ 25–29 ]…”

A General Protocol for Electrospun Non-Woven Fabrics of Dialdehyde Cellulose and Poly(Vinyl Alcohol)

“…These reports addressed, for example, the use of O-phospho-L-serine-conjugated DAC/PVA ESNW-based scaffolds for hard tissue regeneration as a way to bypass the time-consuming preparation steps of phosphopeptide-cellulose conjugate synthesis [28][29][30][31], and the possibility that aldehyde functionalities in the DAC/PVA ESNW matrices could promote ligand immobilization by a simple procedure that involves dipping ESNWs into a dyeing pad [32]. Based on the multitude of follow-up reactions of the contained masked aldehyde groups, DAC/PVA ESNWs are multipurpose materials for conjugating/immobilizing various kinds of biologically active substances [33] or metal oxide nanoparticles [34,35]. This result could inspire tailor-made designs of functionalized ESNWs for novel nano-scaled materials.…”