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This section provides an overview for magnetorheological fluids as well as their applications and principles. Also, please take a look at the list of 7 magnetorheological fluid manufacturers and their company rankings. Here are the top-ranked magnetorheological fluid companies as of January, 2025: 1.ABM Nano LLC., 2.Graphene Research Labs Pvt. Ltd, 3.Arus MR Tech`.
Table of Contents
Magnetorheological fluid, coated with a surfactant 2 to 3 nm thick, is stably dispersed in mediums such as oil or water.
It consists of magnetic fine particles, such as magnetite, blending ferromagnetism of magnetic materials with the fluidity of liquids. This fluid can alter its viscosity and shape under the influence of a magnetic field, provided by a permanent magnet or similar means, exhibiting fluidity with changing magnetic fields. In a magnetic field, its apparent viscosity and specific gravity vary with the field's strength.
Magnetorheological fluids are primarily used in magnetic fluid seals, including dust seals in HDDs to prevent static electricity and vacuum seals in semiconductor manufacturing equipment. They are also utilized in speakers and dampers, increasingly in automobile shock absorbers, and as contrast media for cancer diagnosis in the medical field.
The magnetorheological fluid contains magnetite, acting magnetically only within a magnetic field. Outside a magnetic field, it behaves as a regular fluid but can align like a magnet when exposed to one. Magnetic particles align along the magnetic force lines between the N and S poles, displaying a spiking phenomenon due to the interplay of the orienting force and the fluid's interfacial tension.
Magnetite particles are oxidized to non-magnetic hematite upon air exposure, necessitating a protective surfactant coating to maintain their magnetorheological properties.
Magnetorheological fluids vary by solvent type, including hydrocarbon oil-based, water-based, and fluorinated oil-based fluids. Key to their formulation is the selection of a compatible surfactant with the base fluid, essential for the intended application.
These fluids can be produced through methods like coagulation, pyrolysis, physical vapor deposition (PVD), laser evaporation, chemical vapor deposition, and continuous vacuum deposition on an active liquid surface, with the latter involving surfactants and oil on a rotating vacuum drum and metal heated to around 2,000°C to form fine particles.
As a magnetic colloidal solution, the magnetorheological fluid comprises ferromagnetic particles (e.g., manganese zinc ferrite or magnetite), a surfactant layer, and a base liquid like water or oil. The ferromagnetic particles, approximately 10 nm in diameter, achieve a stable dispersion through the interaction with the surfactant and base liquid.
The optimal particle diameter is around 9 nm, with a surfactant molecular length of 1.5 nm, balancing the need to prevent agglomeration and ensure sufficient magnetism by optimizing the metallic magnetic material's concentration in the fluid.
*Including some distributors, etc.
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ABM Nano LLC, which was established in the 1990s, is a manufacturer located in Houston, Texas, specializing in the metal powder industry and nanotechnology. Its products include high-entropy alloying powder, LLZO powder, magnetorheological fluid (MRF) for AI technology, and mechanical alloying nano-scale composite materials, including MoCu, CuAl2O3, and SiC powder. It introduced a revolutionary mechanical alloying method to process various nano-composite powders, a quality of performance that was previously not possible. These materials serve various industries, including pharmaceuticals, medicine, agriculture, mechanical engineering, and magnetic instruments and devices.
LORD Corporation, established in 1924, is presently situated in North Carolina, United States, and operates as a manufacturer specializing in producing adhesives, coatings, motion management devices, and sensing technologies. These products cater to various industries, including aerospace, automotive, oil and gas, and industrial sectors. The company has strategically facilitated the achievements of its clientele across several industrial and aeronautical sectors through its engineering endeavors. The products play a crucial role in a wide range of industries, encompassing the production and refinement of raw materials, the manufacturing of durable goods, the construction of infrastructure, and various modes of transportation.
Liquids Research Limited, established in 1990 and headquartered in Bangor, North Wales, is a manufacturer specializing in the production of ferrofluids and custom-made magneto-rheological dispersions. Its extensive product lineup includes magnetic liquids, ferrofluids, magnetic inks, magnetorheological fluids, and bioseparation solutions. These materials find application in various fields such as sealing, biomedical technology, loudspeaker design, inkjet printing, and sink-float separation processes. Ferrofluids, or magnetic liquids, are stable colloidal suspensions of single-domain particles of ferromagnetic or ferrimagnetic materials. Meanwhile, magnetorheological fluids are stable suspensions of magnetically polarized micron-sized particles suspended in a low-volatility carrier fluid, usually a synthetic hydrocarbon.
Arus MR Tech is an Indian manufacturer of magnetorheological (MR) fluids and components. The company was founded in 2018 and is headquartered in Chennai. Its main activity is the development and manufacturing of MR fluids and components in the categories that include magnetorheological (MR) fluids, magnetorheological (MR) damper or shocks and MR fluid syringe demos. The company’s scope of application includes vibration/motion control-based devices and optical polishing to obtain high precision and accuracy-based optics. Arus MR Tech's products such as AMT-RHEOTEC + are used by a wide range of customers, including the medical and prosthetic, optics, aerospace, and robotics industries.
Nok Corporation, founded in 1941 and based in Tokyo, Japan, is a manufacturer of several products, including sealing, rubber, and electronic products, and is part of the NOK Group. The company also makes flexible printed circuits (FPC), office automation equipment, and functional membranes, serving industries such as automobile, construction machinery, and electronic equipment. In 1960, the company expanded its production by constructing plants in Kumamoto, Fujisawa, and Shizuoka, and it was listed on the Tokyo Stock Exchange in 1961. In 1979, it was the first to set up a production base in the US before any Japanese automaker.
Ranking as of January 2025
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | ABM Nano LLC. |
23.0%
|
| 2 | Graphene Research Labs Pvt. Ltd |
18.6%
|
| 3 | Arus MR Tech` |
16.2%
|
| 4 | LORD Corporation |
14.5%
|
| 5 | Liquids Research Limited |
13.5%
|
| 6 | NOK CORPORATION |
11.5%
|
| 7 | Moretech Co., Ltd. |
2.7%
|
Derivation Method
The ranking is calculated based on the click share within the magnetorheological fluid page as of January 2025. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
United States of America
|
2 | 50.0% |
|
United Kingdom
|
1 | 25.0% |
Japan
|
1 | 25.0% |
12 products found
12 products
Kyodo International, Inc.
60+ people viewing
Last viewed: 4 hours ago
This allows the recording pattern and magnetization pattern of relatively low-density magnetic recording such as magnetic cards to be visually chec...
Kyodo International, Inc.
40+ people viewing
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This makes optical observation of the recording state of magnetic media extremely easy. In particular, magnetic tape can be developed beautifully w...
Kyodo International, Inc.
50+ people viewing
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■Features ・You can easily observe the recorded pattern by simply applying it to the area you want to observe and letting it dry. ・Dries quickly s...
Kyodo International, Inc.
60+ people viewing
Last viewed: 4 hours ago
Optical observation of the recording state of magnetic media can be performed with an extremely simple operation.
Kyodo International, Inc.
50+ people viewing
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In addition to the examples below, recording patterns on various magnetic recording media can be observed visually or optically. (Audio tapes, comp...
Kyodo International, Inc.
60+ people viewing
Last viewed: 4 hours ago
Observation of magnetic domain shapes in ferromagnetic materials (Sister products: A-05D and A-07 are water-based colloids for magnetic domain obse...
Kyodo International, Inc.
70+ people viewing
Last viewed: 11 minutes ago
Observation of magnetic domain shapes in ferromagnetic materials. (There is a sister product A-05M for magnetic media.) ■Features ・A colloidal li...
Kyodo International, Inc.
60+ people viewing
Last viewed: 14 minutes ago
■Features -Uses a quick-drying fully fluorinated solvent that does not destroy the ozone layer. ・Harmless to the human body and odorless. It is al...
Kyodo International, Inc.
60+ people viewing
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Suitable for developing recorded patterns on magnetic tapes, disks, cards, and other magnetic recording media. (Sister products A-05D and A-07 are ...
Kyodo International, Inc.
50+ people viewing
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Development of recording patterns on magnetic tapes, disks, cards, and other magnetic recording media. ■Features ・A colloidal liquid in which ult...
Kazuki Research Institute
260+ people viewing
Last viewed: 2 hours ago
Very Fast Response
This magnetic beads (Magnetic Beads) is a magnetic nano -particle (magnetic fluid) of nano -sized nano -sized groups that chemically decorate speci...
2 models listed
