Towards high sedimentation stability: magnetorheological fluids based on CNT/Fe3O4nanocomposites

The improvement of properties of magnetorheological fluids and mechanism study has long been a classic area within the field of magnetorheological materials. This article was undertaken to dope the iron nanoparticles synthesized by direct current electric arc discharge with the traditional carbonyl iron powders to prepare bimodal magnetorheological fluids with different doping ratios. Their rheological properties and sedimentation stability were evaluated to explore the influence rules and mechanisms. The results indicate that the effect of the addition of iron nanoparticles on rheological properties under magnetic field is a combination of two opposing factors such as the strengthening of the structure and the weakening of magnetization. The sedimentation stability of the bimodal magnetorheological fluids improved significantly with the increase in the proportion of iron nanoparticles, which is attributed to the help of both free state and adsorbed state iron nanoparticles in magnetorheological fluids. Furthermore, within a specific magnetic field strength range, the bimodal magnetorheological fluids with a small proportion of iron nanoparticles can achieve an improvement in both rheological property and sedimentation stability compared with carbonyl iron particles–based magnetorheological fluids.

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Iron nanoparticles-based magnetorheological fluids: A balance between MR effect and sedimentation stability

Journal of Magnetism and Magnetic Materials ◽

10.1016/j.jmmm.2019.165556 ◽

2019 ◽

Vol 491 ◽

pp. 165556 ◽

Cited By ~ 12

Author(s):

Wanning Zhu ◽

Xufeng Dong ◽

Hao Huang ◽

Min Qi

Keyword(s):

Iron Nanoparticles ◽

Magnetorheological Fluids ◽

Sedimentation Stability ◽

Mr Effect

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S0520303 Sedimentation stability of magnetorheological fluids with newly synthesized organogelators

The Proceedings of Mechanical Engineering Congress Japan ◽

10.1299/jsmemecj.2015._s0520303- ◽

2015 ◽

Vol 2015 (0) ◽

pp. _S0520303--_S0520303-

Author(s):

Ryuji TERAUCHI ◽

Nobuhiro KAITO ◽

Hiroshi TOCHIGI ◽

Yoshihisa WATANABE ◽

Yuichi SAKANISHI ◽

...

Keyword(s):

Magnetorheological Fluids ◽

Sedimentation Stability

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Sedimentation stability and rheological properties of ionic liquid–based bidisperse magnetorheological fluids

Journal of Intelligent Material Systems and Structures ◽

10.1177/1045389x14551436 ◽

2014 ◽

Vol 26 (16) ◽

pp. 2256-2265 ◽

Cited By ~ 11

Author(s):

Ilari Jönkkäri ◽

Matti Isakov ◽

Seppo Syrjälä

Keyword(s):

Ionic Liquid ◽

Rheological Properties ◽

Magnetorheological Fluids ◽

Sedimentation Stability

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Development of the composition of a lubricant for injection under pressure with high sedimentation stability

Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY) ◽

10.21122/1683-6065-2020-3-31-35 ◽

2020 ◽

pp. 31-35

Author(s):

A. A. Pivovarchyk ◽

A. M. Mikhaltsov ◽

Ya. I. Tsishkova

Keyword(s):

Rotational Speed ◽

Mixing Time ◽

Die Casting ◽

Ferrous Alloy ◽

Ferrous Alloys ◽

Sedimentation Stability ◽

High Sedimentation ◽

Optimal Mode ◽

Mixing Frequency ◽

Conducting Research

The article describes the requirements for the lubricant used in injection molding of non-ferrous alloys. A methodology for conducting research to determine the sedimentation stability of a prepared lubricant is presented, as well as the results of a study of the sedimentation stability of a lubricant used in non-ferrous alloy die casting. It was established that in order to significantly increase the sedimentation stability of the compositions of lubricants for casting silumin based on the selected components, it is necessary to pre-heat the initial components to a temperature of at least 80 °C and mix them at a rotational speed of the dispersant blades of at least 6000 min–1. The optimal mode of lubrication with high sedimentation stability (more than 200 days) is observed at the following temperature and time indicators: the temperature of the heating of the starting components is at least 90 °C, the mixing time is 5 minutes, and the mixing frequency is 18000 min–1.

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