Abstract
The aim of this paper is to document suitability of partial substitution of magnetic carbonyl iron (CI) microspheres with iron nanorods to obtain dimorphic magnetorheological (MR) suspensions with comparable MR performance to conventional MR suspensions exclusively based on (CI) microspheres while the sedimentation stability is considerably improved. The morphology of CI and iron nanorods was analyzed via scanning electron microscopy and transmission electron microscopy, respectively, and magnetic properties via vibrating sample magnetometry. The steady shear flow and small-amplitude dynamic oscillatory shear measurements were carried out to confirm effective MR performance. The sedimentation test showed positive role of dimorphic composition of dispersed phase on the sedimentation stability.
Highlights
Magnetorheological (MR) suspensions are generally two-phase systems, in which micrometer-sized ferro- or ferrimagnetic multi-domain particles are suspended in a variety of carrier liquids like silicone or mineral oils [1,2]
The saturation magnetization of iron nanorods is expectedly lower in comparison with microspherical carbonyl iron (CI) particles
A novel dimorphic MR suspension based on partially substituted micrometer-sized spherical CI particles with iron nanorods was prepared and an experimental investigation has been performed to elucidate the effect of such partial substitution on the overall MR performance as well as sedimentation stability
Summary
Magnetorheological (MR) suspensions are generally two-phase systems, in which micrometer-sized ferro- or ferrimagnetic multi-domain particles are suspended in a variety of carrier liquids like silicone or mineral oils [1,2]. The application of large enough field induces a dipole moment in each suspended particle causing the particles to form columnar structures, parallel to the applied field. The formed chain-like or columnar structures restrict the motion of the fluid and, thereby, increase the elastic characteristics of the suspension. The mechanical loading evokes rupturing of created internal structure, the field-induced attractive forces cause “self healing” of particles alignment until the moment, when hydrodynamic forces overcome the field-induced magnetic ones and suspension starts to exhibit yielding behavior. Once the external field is removed, the columnar structures rapidly break under flow and the system immediately returns to its liquid character
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
