Solvent-based fabrication method for magnetic, shape-memory nanocomposite foams
- This paper presents shape-memory foams that can be temporarily fixed in their compressed state and be expanded on demand. Highly porous, nanocomposite foams were prepared from a solution of polyetherurethane with suspended nanoparticles (mean aggregate size 90 nm) which have an iron(III) oxide core with a silica shell. The polymer solution with suspended nanoparticles was cooled down to -20 degrees C in a two-stage process, which was followed by freeze-drying. The average pore size increases with decreasing concentration of nanoparticles from 158 mu m to 230 mu m while the foam porosity remained constant. After fixation of a temporary form of the nanocomposite foams, shape recovery can be triggered either by heat or by exposure to an alternating magnetic field. Compressed foams showed a recovery rate of up to 76 +/- 4% in a thermochamber at 80 degrees C, and a slightly lower recovery rate of up to 65 +/- 4% in a magnetic field.
Verfasserangaben: | Karola LützowGND, Thomas Weigel, Andreas LendleinORCiDGND |
---|---|
DOI: | https://doi.org/10.1557/adv.2019.422 |
ISSN: | 2059-8521 |
Titel des übergeordneten Werks (Englisch): | MRS advances |
Verlag: | Cambridge Univ. Press |
Verlagsort: | Cambridge |
Publikationstyp: | Wissenschaftlicher Artikel |
Sprache: | Englisch |
Datum der Erstveröffentlichung: | 17.09.2020 |
Erscheinungsjahr: | 2020 |
Datum der Freischaltung: | 10.11.2023 |
Freies Schlagwort / Tag: | composite; foam; magnetic; polymer; shape memory |
Band: | 5 |
Ausgabe: | 14-15 |
Seitenanzahl: | 11 |
Erste Seite: | 785 |
Letzte Seite: | 795 |
Fördernde Institution: | Helmholtz AssociationHelmholtz Association; Ministry for Science,; Research and Cultural Affairs of Brandenburg |
Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie |
DDC-Klassifikation: | 5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften |
Peer Review: | Referiert |