TY - JOUR A1 - Winterlik, J. A1 - Fecher, G.H. A1 - Jenkins, C.A. A1 - Medvedev, S. A1 - Felser, C. A1 - Kübler, J. A1 - Mühle, C. A1 - Doll, K. A1 - Jansen, M. A1 - Palasyuk, T. A1 - Trojan, I. A1 - Eremets, M.I. A1 - Emmerling, Franziska T1 - Exotic magnetism in the alkali sesquioxides Rb4O6 and Cs4O6 KW - Caesium compounds KW - Crystal structure KW - Density functional theory KW - Electronic structure KW - Ferromagnetic materials KW - Frustration KW - Magnetic transitions KW - Magnetisation KW - Raman spectra KW - Rubidium compounds KW - Spin glasses KW - X-ray diffraction PY - 2009 DO - https://doi.org/10.1103/PhysRevB.79.214410 SN - 1098-0121 SN - 0163-1829 SN - 0556-2805 SN - 1095-3795 SN - 1550-235X VL - 79 IS - 21 SP - 214410-1 - 214410-6 PB - American Institute of Physics CY - Melville, NY AN - OPUS4-19796 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Utech, S. A1 - Scherer, Christian A1 - Krohne, K. A1 - Carrella, L. A1 - Rentschler, E. A1 - Gasi, T. A1 - Ksenofontov, V. A1 - Felser, C. A1 - Maskos, Michael T1 - Magnetic polyorganosiloxane core-shell nanoparticles: Synthesis, characterization and magnetic fractionation N2 - Here, we present the synthesis, characterization and magnetic separation of magnetic polyorganosiloxane nanoparticles. Magnetic iron oxide nanoparticles with average particle radii of 3.2 nm had been synthesized by a simple coprecipitation process of iron(II) and iron(III) salt in basic solution. Afterwards, the particles were successfully incorporated into a polyorganosiloxane network via a polycondensation reaction of trimethoxymethylsilane (T), diethoxydimethylsilane (D) and the functional monomer (chloromethylphenyl)trimethoxysilane (ClBz-T) in aqueous dispersion. A core–shell system was chosen to increase the flexibility of the system concerning size, composition and functionalization possibilities. The magnetic nanocapsules with particle radii below 60 nm were separated from non-magnetic material with a high effectiveness by the use of commercially available separation columns which are commonly used for isolation of microbeads and subsequently characterized via transmission electron microscopy (TEM), asymmetrical flow field-flow fractionation (AF-FFF), superconducting quantum interference device (SQUID) and Mössbauer spectroscopy. KW - Nanoparticle KW - Magnetic KW - Encapsulation KW - Polyorganosiloxane KW - Magnetic separation PY - 2010 DO - https://doi.org/10.1016/j.jmmm.2010.06.056 SN - 0304-8853 VL - 322 IS - 21 SP - 3519 EP - 3526 PB - Elsevier CY - Amsterdam AN - OPUS4-22248 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -