Prof. Dr. Renivaldo José dos Santos São obtained his master’s degree in physics in 2010 and completed his doctorate in materials science and technology in 2014, both from the Universidade Estadual Paulista Júlio de Mesquita Filho. His skills and expertise mainly include rubber, gold nanoparticles, elastomers, polymers, waste, material characterization, polymeric materials, recycling, and nanoparticles.