Berlin 2015 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 19: Ion and electron beam induced processes
DS 19.1: Hauptvortrag
Mittwoch, 18. März 2015, 09:30–10:00, H 2032
Ferromagnetic shape memory alloys: From ion-beam assisted synthesis to plasma-aided functionalization for biomedical applications — Ariyan Arabi-Hashemi1,2, Uta Allenstein1,3, Florian Szillat1, Astrid Weidt3, Mareike Zink3, and •Stefan G. Mayr1,2,3 — 1Leibniz-Institut für Oberflächenmodifizierung e.V. (IOM), Leipzig — 2Translationszentrum für regenerative Medizin — 3Fakultät für Physik und Geowissenschaften, Universität Leipzig
Yielding magnetically switchable strains of several percent, ferromagnetic shape memory alloys bear enormous potential for contact-less actuators in biomedical applications. We report about recent progress in synthesis and characterization of freestanding Fe-Pd based ferromagnetic shape memory membranes. Energetic ion beams provide a powerful tool to precisely tune materials properties, including phase, the martensite-austenite transformation and magnetic behavior. Employing atomistic computer simulations, we unveil the underlying physics, which is dominated by changes in short range order and defect insertion. We also discuss latest plasma-aided functionalization strategies resulting in covalently-attached and crosslinked amino acids for mechanical coupling to biological cells and tissue. Density functional theory (DFT) calculation unravel the details of bonding, resulting in flexible, but highly durable polypeptide coatings.
[1] T. Edler, S.G. Mayr, Adv. Mater. 22, 4969 (2010).
[2] A. Arabi-Hashemi, S.G. Mayr, Phys. Rev. Lett. 109, 195704 (2012).
[3] M. Zink, F. Szillat, U. Allenstein, S. G. Mayr, Adv. Funct. Mat. 23, 1383 (2013).