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Characteristics of Lunar Dust Simulant Particles Adhered to Spacesuit Materials

Presented by:

Gail Iles

Stephanie S. Batten

School of Science, RMIT University, Melbourne, VIC 3000

 

Gail N. Iles

School of Science, RMIT University, Melbourne, VIC 3000

 

Julie Currie

School of Science, RMIT University, Melbourne, VIC 3000

 

Arman Ahnood

School of Engineering, RMIT University, Melbourne, VIC 3000

Lunar dust poses significant challenges for space exploration as was seen during the Apollo missions. Lunar dust is especially problematic for astronaut health and safety; its electrostatic charge allows it to cling to spacesuit materials and its abrasive nature causes extreme damage to the soles of boots and joints of spacesuits. Furthermore, upon returning to the spacecraft dust particles adhered to spacesuits contaminate the airlock endangering astronaut health. We have created a lunar regolith simulant from a mixture of SiO2 and Al2O3 powders to investigate the mechanisms by which dust sticks to materials commonly used in EVA spacesuits. Scanning Electron Microscopy (SEM) was used to characterise the dust particles adhered to various spacesuit material analogues. Using image processing software, the adhered particle density of the dust was found to be higher on more tightly woven and flatter materials than frayed materials with the particle count ranging from approximately 8000 particles/mm2 to 115,000 particles/mm2. The largest adhered particle size was larger on the more loosely woven materials than the flat materials. The results suggest that the chemical properties of the simulant make it highly adhesive to all the material analogues. The lower adhered particle density on the surface of looser materials suggests either a lower adhesive power of the dust on these materials or the dust has adhered to the underside of the material fibres where it is not visible on a SEM image. Further 3D imaging and analysis of the material fibres and adhered dust is necessary to determine the true adhered particle density of the frayed materials. Nevertheless, as highlighted by this work, the large number of adhered particles on all materials is problematic for lunar spacesuit design and we suggest a protective coating may be necessary to prevent adhesion and penetration of lunar dust particles on spacesuit materials.

Category:

Space engineering & technology, including Cubesats

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