title: Electrorheological and dielectric behavior of new ionic liquid/silica systems.
abstract: New phosphonium-based ionic liquids, denoted, 11-carboxyundecyltriphenylphosphonium bromide (IL1) and octadecyltriphenylphosphonium iodide (IL2), were employed on the sol-gel synthesis to prepare new silica-based matrices. The fastest gelation during the sol-gel process was observed in hydrolysis/condensation of tetraethoxysilane in the presence of IL1. The confinement of ionic liquids (especially IL1) inside the silica networks was suggested by thermogravimetric analysis and Fourier transform infrared spectroscopy. The resulting ionogels present higher permittivity than pure silica and were used as the solid component for the development of new electrorheological fluids, presenting good ER behavior, mainly those prepared with IL1.
authors.affiliation: Universidade Federal do Rio de Janeiro, Instituto de Macromoléculas, Centro de Tecnologia, Bl. J, Ilha do Fundão, 21945-970 Rio de Janeiro, RJ, Brazil. jessica.amarins@gmail.com
authors.forename: Jessica A
authors.initials: JA
authors.lastname: Marins
authors.forename: Bluma G
authors.initials: BG
authors.lastname: Soares
authors.forename: Adriana A
authors.initials: AA
authors.lastname: Silva
authors.forename: Mayra G
authors.initials: MG
authors.lastname: Hurtado
authors.forename: Sebastien
authors.initials: S
authors.lastname: Livi