A dimorphic magnetorheological fluid with improved oxidation and chemical stability under oscillatory shear

0395204 - ÚH 2014 RIV GB eng J - Článek v odborném periodiku
Sedlačík, M. - Pavlínek, V. - Vyroubal, R. - Peer, Petra - Filip, Petr
A dimorphic magnetorheological fluid with improved oxidation and chemical stability under oscillatory shear.
Smart Materials and Structures. Roč. 22, č. 3 (2013), č. článku 035011. ISSN 0964-1726. E-ISSN 1361-665X
Grant CEP: GA ČR GA202/09/1626
Grant ostatní: GA MŠk(CZ) ED2.1.00/03.0111
Institucionální podpora: RVO:67985874
Klíčová slova: goethites * magnetorheological fluids * MR fluids * tetraethylorthosilicate (TEOS)
Kód oboru RIV: BK - Mechanika tekutin
Impakt faktor: 2.449, rok: 2013

The aim of this work was to prepare a dimorphic magnetorheological (MR) fluid for which sedimentation stability, oxidation and chemical stability are enhanced in comparison with common MR fluids, while at the same time preserving the MR effect at its fullest practical level. A dimorphic MR fluid exhibiting these properties was prepared in two steps. The first step involved the partial substitution of carbonyl iron (CI) spherical microparticles with Fe rod-like particles synthesized via a surfactant-controlled solvothermal method. This improved sedimentation stability in comparison with the application of CI particles alone. In the second step both spherical CI and Fe rod-like particles were coated with a polysiloxane layer through the hydrolysis-condensation polymerization of tetraethylorthosilicate. This ensured better oxidation and chemical stability balance with an acceptable decrease in the MR effect. This effect is still markedly better than that based on Fe₃O₄ particles.
Trvalý link: http://hdl.handle.net/11104/0231143