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Collision-Induced Melting in Collisions of Water Ice Nanograins: Strong Deformations and Prevention of Bouncing

Collision-Induced Melting in Collisions of Water Ice Nanograins: Strong Deformations and Prevention of Bouncing
Maureen L. Nietiadi, Philipp Umstätter, Iyad Alabd Alhafez, Yudi Rosandi, Eduardo M. Bringa, Herbert M. Urbassek
Universitas Padjadjaran, Geophysical Research Letters, Volume 44, Issue 21, 16 November 2017, ISSN 0094–8276 (print); ISSN 1944–8007 (online), https://doi.org/10.1002/2017GL075395, http://grl.agu.org
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Universitas Padjadjaran, Geophysical Research Letters, Volume 44, Issue 21, 16 November 2017, ISSN 0094–8276 (print); ISSN 1944–8007 (online), https://doi.org/10.1002/2017GL075395, http://grl.agu.org
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Collisions between ice grains are ubiquitous in the outer solar system. The mechanics of such collisions is traditionally described by the elastic contact theory of adhesive spheres. Here we use molecular dynamics simulations to study collisions between nanometer-sized amorphous water ice grains. We demonstrate that the collision-induced heating leads to grain melting in the interface of the colliding grains. The large lateral deformations and grain sticking induced considerably modify available macroscopic collision models. We report on systematic increases of the contact radius, strong grain deformations, and the prevention of grain bouncing.

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