Dresden 2020 – wissenschaftliches Programm
Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
DY: Fachverband Dynamik und Statistische Physik
DY 33: Granular Matter and Granular Dynamics I
DY 33.4: Vortrag
Mittwoch, 18. März 2020, 10:30–10:45, ZEU 118
Influence of high temperature exposure on adhesive forces in chondritic material — •Cynthia Pillich1,2, Tabea Bogdan1, Joachim Landers1,2, Gerhard Wurm1, and Heiko Wende1,2 — 1Faculty of Physics, University of Duisburg-Essen, 47057 Duisburg, Germany — 2Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47057 Duisburg, Germany
The growth of planetesimals at the so called bouncing barrier is still not fully understood. Compositional and concomitant structural changes of protoplanetary dust induced by high temperatures in the vicinity of the young star might explain improved sticking at the mm-range. As meteorites contain primordial phases representing the material in our young solar system, they offer an insight into the mechanics of planetary formation. A fragment of the iron rich meteorite Sayh al Uhaymir was ground and subsequently heated in vacuum at temperatures up to 1400 K and adhesive forces were determined by Brazilian tests after cooling down to room temperature. We present an altered behaviour of adhesive forces in meteoritic matter upon exposure to high temperatures accompanied by a compositional and structural change, which was investigated by 57Fe Mössbauer spectroscopy probing the abundance of iron bearing phases.
Funding by the DFG (project WE 2623/19-1 and WU 321/18-1) is gratefully acknowledged.