Fluorine Doping of Microporous Organosilica Membranes for Pore Size Control and Enhanced Hydrophobic Properties.

ABSTRACT: Fluorine-doped organosilica membranes for gas and pervaporation (PV) separation were fabricated using a sol-gel method. NH₄F and bis(triethoxysilyl)methane (BTESM) were selected as the dopant and Si precursor, respectively, for the fabrication of fluorine-doped organosilica membranes. Doping with fluorine was evaluated for its effect on the physicochemical properties of organosilica (hydrophobicity/hydrophilicity and network size). Fluorine doping dramatically eliminated the formation of Si-OH groups in the sol, so that the condensation of Si-OH groups during the calcination process was suppressed. It is possible that fluorine doping enlarged the network pore sizes in organosilica, because the F-BTESM (F/Si = 1/9) membrane showed superior He and H₂ permeance with a lo

SUBMITTER: Kanezashi M 

PROVIDER: S-EPMC6644774 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature