Pipette Melt thermoplastic_elastomers HexacontaneFilm flakes Flake Korea FrictionalForce C_AFM Tin sulfide Step Worcester_Polytechnic_Institute Modulus Inorganic_Compound FrictionForce MESA structure BTO WS2 DeflectionOptics KelvinProbeForceMicroscopy Granada self_healing ForceVolumeMapping HanyangUniv PinPointMode nanomechanical StainlessSteel ScratchMode SurfaceChange UTEM Croatia Fet Perovskite Solar PS_LDPE