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Collisions of ice particles play an important role in the formation ofplanetesimals and comets. In recent work we showed, that CO$_2$ ice behaveslike silicates in collisions. The resulting assumption was that it shouldtherefore stick less efficiently than H$_2$O ice. Within this paper aquantification of the latter is presented. We used the same experimental setupto study collisions of pure CO$_2$ ice, pure water ice and 50\% mixtures bymass between CO$_2$ and water at 80K, 1 mbar and an average particle size of$\sim 90 \mu$m. The results show a strong increase of the threshold velocitybetween sticking and bouncing with increasing water content. This supports theidea that water ice is favorable for early growth phases of planets in a zonewithin the H$_2$O and the CO$_2$ iceline.

Ice Grain Collisions in Comparison: CO$_2$, H$_2$O and their Mixtures