Sperm Dental HfO2 Chungnam_National_University Defect HBN MagneticPhase India Etch Wang INSP SKPM Writing MetalCompound layers Platinum chemical_compound CompactDisk nanomechanical Wildtype EPFL Aggregated_molecules Genetic Polystyrene Ptfe PrCurve PDMS LogAmplifier temp biocompatible SrO cooling Stiffness PhthalocyaninePraseodymium Tapping