Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 20: Focus: Functional Polymer Hybrids I
CPP 20.9: Vortrag
Dienstag, 8. März 2016, 12:15–12:30, H51
Self-assembly properties of magnetic filaments in supracolloidal brushes — •Pedro A. Sánchez1, Elena S. Pyanzina2, Ekaterina V. Novak2, Joan J. Cerdà3, Tomas Sintes3, and Sofia S. Kantorovich1,2 — 1University of Vienna, 1090 Vienna, Austria — 2Ural Federal University, 620000, Ekaterinburg, Russia — 3IFISC (UIB-CSIC), 07122 Palma de Mallorca, Spain
Magnetic filaments are chains of magnetic colloids that have been crosslinked with polymers to form permanent polymer-like structures. Recently, we proposed the use of these filaments to create supracolloidal magnetoresponsive coatings with a broad potential for technological applications [Sánchez et al., Macromolecules 2015, 48, 7658–7669; Sánchez et al., Faraday Discussions 2015, DOI:10.1039/c5fd00133a]. The proposed system is obtained by densely grafting the filaments to the coated surface, forming a polymer brush-like arrangement. Our computer simulations show that this system experiences strong equilibrium structural changes as a response to two main external parameters: background temperature and applied magnetic fields. The overall structure of the brush is determined by the self-assembly of the magnetic beads from neighbouring filaments under the influence of such external parameters. Importantly, the presence of the constrains introduced by the grafting surface and the crosslinkers makes this self-assembly significantly different from the one inherent to non crosslinked magnetic colloids in bulk.