Regensburg 2019 – wissenschaftliches Programm
CPP 25.44: Poster
Dienstag, 2. April 2019, 14:00–16:00, Poster B1
Equilibrium behavior of surface-grafted supracolloidal ferromagnetic filaments — •Pedro A. Sánchez1,2, Joan J. Cerdà3, Tomás Sintes4, and Sofia S. Kantorovich1,2 — 1Computational Physics, University of Vienna, Vienna, Austria — 2Ural Federal University, Ekaterinburg, Russia — 3IAC3, Universitat de les Illes Balears, Palma de Mallorca, Spain — 4Instituto de Física Interdisciplinar y Sistemas Complejos, UIB-CSIC, Palma de Mallorca, Spain
Supracolloidal magnetic filaments, that are semiflexible chains of magnetic micro- or nanoparticles permanently crosslinked by polymers, are used for the creation of magnetically driven microfluidic propellers and pumpers, micromechanical sensors and contrast imaging agents. These systems have been also proposed as building blocks of thin films that can change their structure and rheological properties as a response to external magnetic fields. Most of such applications involve the interaction of free or end grafted filaments with inert or attracting surfaces.
Here we study, by means of computer simulations, the equilibrium structures of individual magnetic filaments made of ferromagnetic particles when placed near to interacting flat surfaces. We focus on the structural changes that take place on cooling depending on the strength of the interaction with the surface and the applied field, comparing the cases of free and grafted filaments.