TY JOUR TI Preparation of tetraethoxysilane to obtain spherical silica particles. Part 1. Ultrafiltration KW monodisperse spherical silica particles KW supramolecular structures KW ultrafiltration JO Vestnik of geosciences AU Kamashev, D.V. PY 2022 IS 0 PB FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"