Biogenic iron oxide nanoparticles synthesized from Padina gymnospora: Phytochemical screening, morphological characterization, and thermal stability - Rajiv Periakaruppan; Rajaarunachalam Kannan; Joaval Antony Martin; Danusree Babu; Karungan Selvaraj Vijai Selvaraj (Next Nanotechnology, 2026)