R. v. Klitzing: Mechanical properties of multifunctional magnetic microgel-particles
Description
The project addresses the magneto-mechanical properties of multifunctional hybrid polymer microgel particles. The diameter of the polymer microgel particles can be adjusted in a range between 300 nm - 2 micrometer. They contain magnetic nanoparticles (MNP) with a diameter up to 20 nm. The gel is based on the thermoreponsive polymer Poly(N-isopropyl-acrylamide) (PNIPAM). The further addition of commoners allows tuning the pH sensitivity. One challenge is the control of the coupling between the MNP and polymer matrix in order to tailor the deformation and mechanical changes of the whole microgel induced by a magnetic field. For the optimization of the uptake of magnetic particles and for the control of their mobility the meshsize will be adjusted with respect to the size of the magnetic particles by the amount of crosslinker. The direct coupling of the MNP will be tailored by electrostatic interaction and hydrogen bonding via the addition of charged comonomers.
For studying the effect of confinement on the magnetic sensitivity of the microgel particles they will be adsorbed at a planar surface (wafer). In addition this configuration serves also for studies of mechanical and actuator properties. Within the project a magnetic environment for AFM measurements will be developed. Finally a gradient non-uniform magnetic field perpendicular and a homogeneous field parallel to the planar surface will be available. The influence of the orientation on the viscoelastic behavior and the deformation will be studied.
Fotos wässriger Lösung mit PNIPAM (oben) and PNIPAM-co-allylamin (unten). Beide Lösungen enthalten zudem magnetische Nanopartikel (MNP). Insets: TEM Bilder, PNIPAM-gelpartikel enthalten keine MNP, während PNIPAM-co-allylamine MNP enthalten. Letztere könne
Project Manager
Prof. Dr. Regine v. Klitzing, TU Berlin
Staff
Sebastian Backes, TU Berlin
Marcus Witt, TU Berlin
Grant period
2013 - 2015
Publications
[1] S. Schmidt, H. Motschmann, T. Hellweg, R. v. Klitzing, Polymer, 2008 49, 749.
[2] A. Burmistrova, M. Richter, C. Üzüm, R. v. Klitzing Coll. Pol. Sci. 2011, 289, 613.
[3] H. Lange, N. G. Bastus, A. Carl, M. Richter, H. Weller, B. H. Juarez, C. Thomsen, R. v. Klitzing, A. Knorr Langmuir, 2012, 28 8862.
[4] K. Gawlitza, S. T. Turner, F. Polzer, S. Wellert, M. Karg, P. Mulvaney, R. v. Klitzing PCCP 2013, 15, 15623.
Contact
TU Berlin, Sekr. TC09
Fakultät II Naturwissenschaften und Mathematik
Lehrstuhl Angewandte Physikalische Chemie
Straße des 17. Juni 124
10623 Berlin