Hydroxyapatite PVAC WWafer NTU fluorocarbon HardDisk FrictionalForceMicroscopy HardDiskMedia hetero_structure Tungsten_disulfide Gong PMNPT MembraneFilter Au111 FrictionalForce ConductingPolymer Sadowski Trench fe_nd_b Silicon SrTiO3 P3HT Imprint Bmp Ucl MechanicalProperties SICM Pore semifluorinated_alkane ElectroChemical OrganicSemiconductor Metal CuFoil MfmAmplitude FailureAnalysis