Christmas AtomicLayer AdhesionEnergy GalliumPhosphide non_contact fe_nd_b UnivCollegeLondon HydroGel Hexacontane AtomicSteps Mechinical ChemicalCompound Sio2 temperature_control PtfeMembrane Conductivity SKKU Microchannel Film CastIron Hydroxyapatite Dr.JurekSadowski Optoelectonics polymeric_arrays SurfaceChange Fiber Wafer layers HighAcpectRatio Dopped LateralForceMicroscopy Step SThM KAIST DOE