We study squalane and heptamethylnonane (HMN) confined between a conducting atomic force microscope tip and a graphite surface. Solvation layering occurs for both liquids but marked differences in the squeeze out mechanics are observed for ordered or disordered monolayers. The squalane monolayer at 25 degrees C is an ordered solid, as verified by direct imaging, and the squeeze out can be model...

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An effort was made to study and characterize the evolution of transient tribological wear in the presence of sliding contact. Sliding contact is often characterized experimentally via the standard ASTM D4172 four-ball test, and these tests were conducted for varying times ranging from 10 seconds to 1 hour, as well as at varying temperatures and loads. A numerical model was developed to simulate...

We perform a combined experimental and theoretical approach to establish the atomistic origin of energy dissipation occurring while imaging a molecular surface with an amplitude modulation atomic force microscope. We show that the energy transferred by a single nano-asperity to a sexithiophene monolayer is about 0.15 eV/cycle. The configuration space sampled by the tip depends on whether it app...

Abstract The contact calculation of three-dimensional real rough surfaces is the frontier field tribology and surface science. In this study, we consider interaction elastic-plastic deformation characteristics asperities further, propose an analytical method for considering asperities. Based on watershed algorithm, segmented are reconstructed into ellipsoids. According to height relationship be...

Understanding rock shear failure behavior is crucial to gain insights into slip-related geohazards such as avalanches, landslides, and earthquakes. However, descriptions of the progressive damage on surface are still incomplete or ambiguous. In this study, we use hybrid finite-discrete element method (FDEM) simulate a experiment obtain detailed comprehension induced associated seismic activity....