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Sammanfattning

The creation of protein-based magnetic fibers is a strategic issue in the field of advanced biocompatible materials, particularly relevant for technological sectors such as soft robotics and smart medicine. Here, we endow artificial spider silk fibers, which outperform many man-made fibers in terms of mechanical properties, with magnetic functionality through the incorporation of magnetic nanoparticles. We present two novel composite fibers, containing magnetite nanoparticles coated with aminopropylsilane and dextran, and compare them with a third fiber type, which was made, following an approach previously developed by us, using magnetite nanoparticles coated with dimercaptosuccinic acid. The nanoparticles also differ in their mean size, varying between 9 and 32 nm. The fibers are produced by wet spinning, with a nominal magnetite concentration in the 0.2-20 wt.% range. However, the coating rules the colloidal stability of the nanoparticles in the spinning dope and their tendency to agglomerate. Therefore, the actual magnetite concentration and the degree of dispersion of the nanoparticles in the fibers are different in the different composites, as revealed by magnetic analyses. All fibers, even those with the highest magnetite content, remain ductile, whereas the mechanical strength is only slightly reduced compared to the fiber without nanoparticles, hence without magnetic functionality.

Nyckelord

coated magnetite nanoparticles; magnetically responsive biomaterials; mechanically soft fibers; protein-based magnetic composites; spider silk fibers

Publicerad i

Macromolecular Materials and Engineering
2025
Utgivare: WILEY-V C H VERLAG GMBH

SLU författare

UKÄ forskningsämne

Nanoteknisk materialvetenskap
Textil-, gummi- och polymermaterial

Publikationens identifierare

  • DOI: https://doi.org/10.1002/mame.202500249

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/143147