Contacts of Water Ice in Protoplanetary Disks – Laboratory Experiments. (arXiv:1902.08503v1 [astro-ph.EP])
<a href="http://arxiv.org/find/astro-ph/1/au:+Musiolik_G/0/1/0/all/0/1">Grzegorz Musiolik</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wurm_G/0/1/0/all/0/1">Gerhard Wurm</a>
Water ice is abundant in protoplanetary disks. Its sticking properties are
therefore important during phases of collisional growth. In this work, we study
the sticking and rolling of 1.1 mm ice grains at different temperatures. We
find a strong increase in sticking between 175 K to 200 K which levels off at
higher temperatures. In terms of surface energy this is an increase with a
factor of 63.4, e.g. from $gamma = 0.0029 rm J/m^2$ to $gamma = rm 0.19
J/m^2$, respectively. We also measured critical forces for inelastic rolling.
The critical rolling distance is constant with a value of 0.19 mm. In view of
planetesimal formation at low temperatures in protoplanetary disks, the surface
energy is not larger than for silicate dust and ice aggregation will share the
same shortcommings. In general, water ice has no advantage over silicates for
sticking and collisional growth might not favor ice over silicates.
Water ice is abundant in protoplanetary disks. Its sticking properties are
therefore important during phases of collisional growth. In this work, we study
the sticking and rolling of 1.1 mm ice grains at different temperatures. We
find a strong increase in sticking between 175 K to 200 K which levels off at
higher temperatures. In terms of surface energy this is an increase with a
factor of 63.4, e.g. from $gamma = 0.0029 rm J/m^2$ to $gamma = rm 0.19
J/m^2$, respectively. We also measured critical forces for inelastic rolling.
The critical rolling distance is constant with a value of 0.19 mm. In view of
planetesimal formation at low temperatures in protoplanetary disks, the surface
energy is not larger than for silicate dust and ice aggregation will share the
same shortcommings. In general, water ice has no advantage over silicates for
sticking and collisional growth might not favor ice over silicates.
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