Polystyrene 2d_materials PatternedSapphireSubstrat Potential PolymerPatterns FM-KPFM Melt SKPM NTU Microchannel Ptfe MagneticForceMicroscopy Phthalocyanine hard_disk CuParticle Bio cannabis KelvinProbeForceMicroscopy non_contact Metal NUS AM_SKPM LDPE Plug cannabinoid Typhimurium Dental margarine HexacontaneFilm ring shape pinpoint mode Liquid Boron Calcium Vacuum