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Area of Science:

  • Tribology
  • Surface Science
  • Materials Science

Background:

  • Understanding interfacial molecular structure is crucial for boundary lubrication.
  • Frictional properties are intimately linked to molecular arrangements at interfaces.

Purpose of the Study:

  • To investigate the interfacial structure and frictional behavior of stearic acid (SA) solutions.
  • To elucidate the relationship between molecular configuration and friction under varying loads.

Main Methods:

  • Frequency-modulation atomic force microscopy (FM-AFM) to visualize interfacial structures.
  • Lateral force microscopy (LFM) to measure frictional forces.
  • Derjaguin-Muller-Toporov (DMT) model for contact pressure analysis.

Main Results:

  • FM-AFM revealed vertically adsorbed SA molecules and a parallel-oriented n-hexadecane (HD) solvation layer.
  • The HD solvation layer disrupted under ~15.6 pN loading.
  • LFM showed a friction coefficient transition around 123 pN, indicating load-dependent structural changes.

Conclusions:

  • Low friction under light load is attributed to the parallel alignment of HD molecules on the SA film.
  • The study confirms consistent breakthrough pressure measurements between FM-AFM and LFM.
  • Interfacial molecular configuration significantly dictates boundary lubrication performance.