Particle-size sorting system of lunar regolith using electrostatic traveling wave

M. Adachi*, H. Moroka, Hiroyuki Kawamoto, S. Wakabayashi, T. Hoshino

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    23 Citations (Scopus)


    A particle-size sorting system of lunar regolith using an electrostatic traveling wave is developed for In-Situ Resource Utilization on the Moon to extract indispensable resources from the regolith and realize long-term exploration. The regolith is sorted by utilizing a balance between the electrostatic and gravitational forces, which are determined depending on particle size, in vacuum conditions where the particles are not subjected to air drag. In this study, the effect of particle charge on the particle motion is confirmed by conducting model experiments and numerical calculations based on the distinct element method. In addition, it was experimentally demonstrated that particles less than approximately 20 μm in diameter were efficiently separated from the bulk of a lunar regolith simulant FJS-1 in a vacuum condition (∼1.5 × 10−2 Pa), and the performance of the size sorting system on the Moon was predicted by the numerical calculations. The system utilizes only the electrostatic force, and it does not require any gas, liquid, or mechanical moving parts.

    Original languageEnglish
    Pages (from-to)69-76
    Number of pages8
    JournalJournal of Electrostatics
    Publication statusPublished - 2017 Oct 1


    • Aerospace engineering
    • In situ resource utilization
    • Regolith
    • Size sorting

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Biotechnology
    • Condensed Matter Physics
    • Surfaces, Coatings and Films
    • Electrical and Electronic Engineering


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