Factors affecting the electrification of wind-driven dust studied with laboratory simulations

The electrification of wind-blown dust grains was studied in a series of laboratory experiments to examine how grain electrification depends on grain size, grain mineralogy, atmospheric composition, atmospheric pressure, and the method of dust dispersal. This work is intended to contribute to a deeper physical understanding of particle electrification on both Mars and Earth. Findings indicate that the amount of electrification per suspended particle generally is independent of dust entrainment process and atmospheric composition. As expected, the electrification process is grain size-dependent, with smaller grains predominantly electrifying negatively. Although there appears to be a weak dependence upon dust mineralogy, this work supports the expectation that dust suspended in the Martian atmosphere will be significantly electrified. ► Dust electrification is not dependent on the entrainment process. ► It appears independent of atmospheric composition and pressure. ► As expected dust electrification is size dependent. ► Mineral dependence is weak indicating Martian dust is electrified.