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non_contact Floppy Friction Tungsten_disulfide AlkaneFilm LifeScience organic_polymer Ferrite LithiumNiobate WPlug Pzt CompactDisk medical Indium_tin_oxide Polyethylene Oxide HighResolution TemperatureControlledAFM Zhi Chungnam_National_University GaAs Grain Bacteria Fluoride TempControl Ucl CalciumHydroxyapatite cross section PolyStylene temp_control Lift HighAcpectRatio Sapphire ScanningTunnelingMicroscopy TiO2