Ionic liquid-based organically modified silica for the development of new electrorheological fluids

[Display omitted] This work describes the preparation of novel electrorheological (ER) fluids consisted of organically modified silica particles with imidazolium-based ionic liquid (IL-ORMOSIL) suspended in a silicone oil. The IL-ORMOSIL was prepared by hydrolysis/co-condensation of tetraethoxy sila...

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Published inColloids and surfaces. A, Physicochemical and engineering aspects Vol. 529; pp. 311 - 319
Main Authors Marins, Jéssica A., Soares, Bluma G.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 20.09.2017
Elsevier
Subjects
Chemical Sciences
Dielectric properties
Electrorheological fluids
Ionic liquid
Material chemistry
ORMOSIL
Sol-gel process
ORMOSIL
Electrorheological fluids
Sol-gel process
Dielectric properties
Ionic liquid
ionic liquid
sol-gel process
electrorheological fluids
dielectric properties
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Summary:[Display omitted] This work describes the preparation of novel electrorheological (ER) fluids consisted of organically modified silica particles with imidazolium-based ionic liquid (IL-ORMOSIL) suspended in a silicone oil. The IL-ORMOSIL was prepared by hydrolysis/co-condensation of tetraethoxy silane (TEOS) in the presence of different concentration of 1-(3-trimethoxysilylpropyl)-3-methylimidazolium chloride (IL-TMOS), using the one-pot sol-gel process. IL-ORMOSIL particles with controlled morphology were obtained, as indicated by transmission electronic microscopy (TEM). The presence of the silylated ionic liquid covalently attached to the silica particles was confirmed by thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The effect of the amount of imidazolium-based ionic liquid immobilized on the spherical silica particles on the electrorheological (ER) behavior of the corresponding suspensions in silicone oil was investigated. A significant ER effect was observed for the fluid containing silica modified with around 10%wt. of IL-TMOS. In fact, a very good, extremely rapid and reversible response under the action of an electric field at intensity to 4kV/mm was achieved, with shear stress value as high as 2200Pa. The dielectric properties were also evaluated to explain the ER response of these IL-ORMOSIL particles
ISSN:0927-7757
1873-4359
DOI:10.1016/j.colsurfa.2017.05.091