11:00 AM. 424. Antibiotic‑Free Polyethylenimine Synergized Biomimetic Antibacterial Nanoparticle Metal Implant Coatings Create Anti‑Adhesive, Antibiofilm Surfaces.Juliane Hopf, PhD1, Carlie Kudary1, Prakash Nallathamby, Ph.D.1, conor Sheehan, BS1, Deborah Donahue, BS1, Victoria Ploplis, PhD1, Francis Castellino, PhD1 1University of Notre Dame