NANOSILICA FROM THE BOILER ASH OF THE SUGAR CANE INDUSTRY AS A FILLER OF POLYSULFONE AND SULFONATED POLYETHERETHERKETONE MEMBRANES IN DIRECT METHANOL FUEL CELL. Jurnal Teknologi Industri Pertanian, [S. l.], v. 28, n. 1, 2018. Disponível em: https://journal.ipb.ac.id/jurnaltin/article/view/23261. Acesso em: 22 jun. 2026.