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PtfeFilter Piranha Pvdf Piezo Calcium Heating FrictionalForce Adhesive conductive Nanotechnology Hafnia NusEce HardDiskMedia blended polymers IIT-chennai SiliconOxide Bacteria ThinFilm PVA NtuEee Lanthanum_aluminate Materials STM small_scan Workfunction India block_copolymer Step Calcite Boundary TappingMode ContactMode BismuthFerrite chemical_compound Titanate