Adhesive forces play a significant role on airless bodies due to their weak gravities. Investigating adhesion at the surface of asteroids and their constituent components is vital to understanding their formation and evolution. Previous research has been done to understand the interaction of micron-sized spheres to planar surfaces and sphere-to-sphere interactions, which have been used to develop models of asteroid surfaces. Our investigation experimentally investigates adhesion through atomic force microscopy (AFM) measurements between JSC-1 simulant particles and several AFM tips, including a typical pyramidal gold tip and microspheres of sizes 2 μm and 15 μm. The samples of JSC-1 consist of three size ranges: < 45 μm, 75-125 μm, and 125-250 μm. For each sample we looked at the magnitude and distribution of the measured adhesive forces. Results show that the pyramidal tip produced larger forces than the spherical tips generally, and the sample that produced larger forces and a larger distribution of those force was the smaller, more powder-like sample with sizes < 45 μm.
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Master of Science (M.S.)
College of Sciences
Physics; Planetary Sciences
Length of Campus-only Access
Masters Thesis (Open Access)
Jardine, Keanna, "Asteroid Surfaces: The Importance of Cohesive Forces" (2019). Electronic Theses and Dissertations. 6607.