SKM 2021 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 18: Posters Magnetism V
MA 18.1: Poster
Freitag, 1. Oktober 2021, 10:00–13:00, P
Influence of surface water on adhesive forces in chondritic material — •Cynthia Pillich1, Tabea Bogdan2, Joachim Landers1, Gerhard Wurm2, and Heiko Wende1 — 1University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE), Faculty of Physics, Lotharstr. 1, 47057 Duisburg, Germany — 2University of Duisburg-Essen, Faculty of Physics, Lotharstr. 1, 47057 Duisburg, Germany
The growth of planetesimals at the so called "bouncing barrier" is still
not fully understood. Evaporation of surface water on protoplanetary
dust grains 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 compare changes in adhesive forces upon exposure to high temperatures of meteoritic matter holding surface water
and dried material. Compositional and concomitant structural transformations induced by tempering were investigated by 57Fe-Mössbauer
spectroscopy, probing the abundance of iron bearing phases.
Funding by the DFG (projects WE 2623/19-1 and WU 321/18-1) is gratefully acknowledged.