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.
Author details: | Karola LützowGND, Thomas Weigel, Andreas LendleinORCiDGND |
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DOI: | https://doi.org/10.1557/adv.2019.422 |
ISSN: | 2059-8521 |
Title of parent work (English): | MRS advances |
Publisher: | Cambridge Univ. Press |
Place of publishing: | Cambridge |
Publication type: | Article |
Language: | English |
Date of first publication: | 2020/09/17 |
Publication year: | 2020 |
Release date: | 2023/11/10 |
Tag: | composite; foam; magnetic; polymer; shape memory |
Volume: | 5 |
Issue: | 14-15 |
Number of pages: | 11 |
First page: | 785 |
Last Page: | 795 |
Funding institution: | Helmholtz AssociationHelmholtz Association; Ministry for Science,; Research and Cultural Affairs of Brandenburg |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie |
DDC classification: | 5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften |
Peer review: | Referiert |