Plasma-treated carbonyl iron particles as a dispersed phase in magnetorheological fluids

0363140 - ÚH 2012 RIV NL eng J - Journal Article
Sedlačík, M. - Pavlínek, V. - Lehocký, M. - Mráček, A. - Grulich, O. - Švrčinová, Petra - Filip, Petr - Vesel, A.
Plasma-treated carbonyl iron particles as a dispersed phase in magnetorheological fluids.
Colloids and Surfaces A-Physicochemical and Engineering Aspects. Roč. 387, 1-3 (2011), s. 99-103. ISSN 0927-7757. E-ISSN 1873-4359
Grant - others:GA ČR(CZ) GD104/09/H080; OP VaVpI(XE) CZ.1.05/2.1.00/03.0111
Program: GD
Institutional research plan: CEZ:AV0Z20600510
Keywords : carbonyl iron * magnetorheological fluid * plasma * viscoelasticity
Subject RIV: BK - Fluid Dynamics
Impact factor: 2.236, year: 2011

The aim of this paper is to document suitability of plasma-treated carbonyl iron particles as a dispersed phase in magnetorheological fluids. Surface-modified carbonyl iron particles were prepared via their exposure to 50% argon and 50% octafluorocyclobutane plasma. The X-ray photoelectron spectroscopy was used for analysis of chemical bonding states in the surface layer. Plasma-treated particles were adopted for a dispersed phase in magnetorheological (MR) fluids, and the MR behaviour was investigated using rotational rheometer equipped with magnetic field generator. Viscoelasticity changes of MR fluids were measured in the small-strain oscillatory shear flow as a function of the strain amplitude, frequency and the magnetic flux density. The MR fluids based on plasma-treated particles exhibit promoted suspension stability, which is attributed to the interactions between fluorine bonded on particle surface and methyl groups of silicone oil.
Permanent Link: http://hdl.handle.net/11104/0199204