Collisions of ice particles play an important role in the formation of planetesimals and comets. In recent work we showed, that CO2 ice behaves like silicates in collisions. The resulting assumption was that it should therefore stick less efficiently than H2O ice. Within this paper a quantification of the latter is presented. We used the same experimental setup to study collisions of pure CO2 ice, pure water ice and 50\% mixtures by mass between CO2 and water at 80K, 1 mbar and an average particle size of ∼90μm. The results show a strong increase of the threshold velocity between sticking and bouncing with increasing water content. This supports the idea that water ice is favorable for early growth phases of planets in a zone within the H2O and the CO2 iceline.
@article{arxiv.1608.05017,
title = {Ice Grain Collisions in Comparison: CO$_2$, H$_2$O and their Mixtures},
author = {Grzegorz Musiolik and Jens Teiser and Tim Jankowski and Gerhard Wurm},
journal= {arXiv preprint arXiv:1608.05017},
year = {2016}
}