title: New electrorheological fluid obtained from mercaptosilsesquioxane-modified silicate suspensions.
abstract: Ormosil based on mercaptosilsesquioxane-modified silicate (SiO2/SSQ-SH) particle was prepared by sol-gel process involving a co-condensation of the hydrolyzed 3-mercaptopropyl-trimethoxysilane (MPTMS) and tetraetoxysilane (TEOS). The resulting material was characterized by (29)Si solid nuclear magnetic resonance spectroscopy ((29)Si NMR), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field-emission scanning electron microscopy (FEG-SEM) and small angle X-ray scattering (SAXS). The (SiO2/SSQ-SH) particle presents a hierarchical structure, extending from micro to nanoscale and consisting of three structural levels. This SiO2/SSQ-SH particle was used for the first time as the dispersed phase in silicone oil suspension to develop a new electro-rheological fluid with a very good response under the action of electrical field from 1 to 4 kV/mm, whose values are comparable to those exhibited by other conventional ER fluids, under the influence of electric field.
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.
authors.forename: Jéssica A
authors.initials: JA
authors.lastname: Marins
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.
authors.forename: Karim
authors.initials: K
authors.lastname: Dahmouche
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. Electronic address: bluma@ima.ufrj.br.
authors.forename: Bluma G
authors.initials: BG
authors.lastname: Soares
mesh_terms: D005782:Gels / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D012212:Rheology; D053838:Scattering, Small Angle; D017640:Silicates / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D012827:Silicone Oils / Q000737:chemistry; D012833:Siloxanes / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D013535:Suspensions / Q000737:chemistry; D014783:Viscosity; D014961:X-Ray Diffraction
chemical_list: D005782:Gels; D017640:Silicates; D012827:Silicone Oils; D012833:Siloxanes; D013438:Sulfhydryl Compounds; D013535:Suspensions; C510784:ormosil; D012822:Silicon Dioxide