3D Arrangement of Magnetic Particles in Thin Polymer Films Assisted by Magnetically Patterned Exchange Bias Layer Systems. (31st October 2021)

• Record Type: Journal Article
• Authors: Koch, Iris; Langner, Markus; Holzinger, Dennis; Merkel, Maximilian; Reginka, Meike; Huhnstock, Rico; Tomiţa, Andreea; Jauregui Caballero, Claudia; Greiner, Andreas; Ehresmann, Arno
• Is Part Of: Particle and particle systems characterization. Volume 38:Number 12(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-10-31
• Subjects: exchange bias -- ion bombardment -- iron oxide -- magneto‐sensitive elastomers -- polydimethylsiloxane -- polyvinyl alcohol; Particles -- Periodicals; 620.43
• DOI: 10.1002/ppsc.202100072
• Languages: English
• ISSNs: 0934-0866

Abstract

Abstract: The possibility to arrange and embed magnetic micro‐ and nanoparticles in thin polymer film systems using flat magnetically patterned substrate templates is investigated. In contrast to self‐organized particle rows forming by applying a homogeneous magnetic field, particles adapt to the magnetic field landscape of the substrate's magnetic pattern prior to polymer crosslinking. Crosslinking then fixes the particle positions in the polymer. The process is tested for composites of hydrophobic polydimethylsiloxane (PDMS) and maghemite nanoparticles as well as for hydrophilic polyvinyl alcohol (PVOH) and hydrophilic functionalized, superparamagnetic core–shell microspheres. The substrate template is an exchange bias layer system magnetically patterned into parallel‐stripe domains with in‐plane magnetizations and head‐to‐head/tail‐to‐tail remanent magnetization orientation in adjacent magnetic domains. A high occupancy percentage of magnetic beads on a domain wall as well as anisotropic actuation of the composite is achieved. Abstract : The magnetic field landscape of magnetically patterned substrates is used as a template for the defined positioning of magnetic particles in thin polymer films. Experimental studies are conducted for different combinations of magnetic and polymer materials. The quantitative analysis of the particle arrangement quality is followed by a theoretical study and first experiments on the magnetic actuation of the composites.