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.
Highlights
Magnetic paper has constantly attracted considerable attention due to its potential application in a wide range of technologies including information storage [1], electromagnetic shielding, magnetographic printing, magnetic filtering, and security paper [2]
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
Attempts have been made to alleviate this problem by tailoring the optical properties of the magnetic fillers [5,7,9], but no satisfactory compromise between magnetic loading and coloring degree was achieved so far
Summary
Magnetic paper has constantly attracted considerable attention due to its potential application in a wide range of technologies including information storage [1], electromagnetic shielding, magnetographic printing, magnetic filtering, and security paper [2]. Different preparation methods have been developed towards the generation of magnetic paper using magnetic nanoparticle-based fillers: Direct wet end addition, lumen loading, in situ magnetic particle synthesis, and fiber nanocoating [3]. For this purpose, a wide range of magnetic fillers were considered: Bare nanoparticles [2,4], organic capped nanoparticles [5], single core-(oxide)shell particles [6], multicore-(oxide)shell particles [7], and fibers [8]. A drawback due to the use of cobalt ferrite nanoparticles is the rather high ~5 emu/g remanent magnetization and ~200 Oe coercive field, which is an important limiting factor in certain applications like electromagnetic shielding, magnetic filtering, or security paper
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