Micrometer-sized ice particles for planetary-science experiments - I. Preparation, critical rolling friction force, and specific surface energy

Abstract

Coagulation models assume a higher sticking threshold for micrometer-sized ice particles than for micrometer-sized silicate particles. However, in contrast to silicates, laboratory investigations of the collision properties of micrometer-sized ice particles (in particular, of the most abundant water ice) have not been conducted yet. Thus, we used two different experimental methods to produce micrometer-sized water ice particles, i. e. by spraying water droplets into liquid nitrogen and by spraying water droplets into a cold nitrogen atmosphere. The mean particle radii of the ice particles produced with these experimental methods are $(1.49\pm 0.79)\mu \mathrm{m}$ and $(1.45\pm 0.65)\mu \mathrm{m}$. Ice aggregates composed of the micrometer-sized ice particles are highly porous (volume filling factor: $\varphi =0.11\pm 0.01$) or rather compact (volume filling factor: $\varphi =0.72\pm 0.04$), depending on the method of production. Furthermore, the critical rolling friction force of $F_{Roll,ice}=(114.8\pm 23.8)\times 10^{-10}\mathrm{N}$ was measured for micrometer-sized ice particles, which exceeds the critical rolling friction force of micrometer-sized $\mathrm{Si}{\mathrm{O}}_2$ particles ($F_{Roll,Si{O}_2}=(12.1\pm 3.6)\times 10^{-10}\mathrm{N}$). This result implies that the adhesive bonding between micrometer-sized ice particles is stronger than the bonding strength between $\mathrm{Si}{\mathrm{O}}_2$ particles. An estimation of the specific surface energy of micrometer-sized ice particles, derived from the measured critical rolling friction forces and the surface energy of micrometer-sized $\mathrm{Si}{\mathrm{O}}_2$ particles, results in ${\gamma }_{ice}=0.190\mathrm{J}{\mathrm{m}}^{-2}$.

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