Titanate AM-KPFM self_healing Ucl HardDiskMedia VortexCore MBE ScratchMode SICM FrictionForce MESA structure Microchannel Chloroform Defect OpticalWaveguides Polystyrene Copolymer Pores ContactModeDots FM_KPFM Treatment dichalcogenide Hafnium_dioxide gallium_nitride Bio LiIonBattery fluorocarbon Step Leakage Wonseok EPFL Vacuum DomainSwitching Nanotechnology Defects