Abstract
In this study, we examined three kinds of stabilizing additives to prepare stable MRF with good fluidity. We selected three stabilizing additives; a styrene isoprene block copolymer, a hydrophobic fumed silica, and an organogelator (CMOL SB03; PMDA-2C8/oleyl). We measured the rheological properties both for the dissolutions of the stabilizing additives in the base oil and MRFs prepared with the additives by using a rheometer; MCR302 (Anton Paar Corp.). From the experimental results, the viscosity of styrene isoprene block copolymer dissolution increased with concentration showing non-Newtonian properties. We selected a suitable concentration as 5wt% to satisfied good fluidity without forming gel. Since the viscosities of 7wt% fumed silica and 1wt% CMOL SB 03 dissolutions in the base oil consequently showed similar viscosity of the 5wt% copolymer, MRFs using such conditions were prepared. From the results of the stability test, the addition of the copolymer was effective to satisfy the stability of the MRF. We also found that the addition of such stabilizing additives were effective to increase the magnetic property of MRFs.
Highlights
A magnetorheological fluid (MRF) is an oil slurry with magnetic particles
The fluidity of MRF relates the viscosity of a base oil and the size and the concentration of particles
Surface coating of magnetic particles is effective on the stability (Fang et al, 2012); the magnetic characteristic decreases for both methods
Summary
A magnetorheological fluid (MRF) is an oil slurry with magnetic particles. MRF attracts much attention as a functional fluid, of which viscosity can be controlled by magnetic field (Rabinow, 1948). The fluidity of MRF relates the viscosity of a base oil and the size and the concentration of particles. Using smaller particles can increase the stability of MRF. The addition of nanoparticles (Park et al, 2009) and increasing the viscosity of the base oil (Kim et al, 2012) are effective to increase the stability, and the magnetic characteristics. The viscosity of MRF increases, the slurry loses its fluidity. The objective of this study was to increase the sedimentation stability of MRF by using suitable stabilizing additives. We examined the effect of such additives on the magneto-rheological characteristics of MRF
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