Ultrasonication Temperature Effects on The Green Synthesis of Silica Nanoparticles from Oil Palm ShellAlvika Meta Sari, Wan Hamzah Azmi, Mahendran Samykano, Anwar Ilmar Ramadhan and Efrizon UmarE3S Web Conf., 681 (2025) 03003DOI: https://doi.org/10.1051/e3sconf/202568103003