Ferrofluid, also known as magnetic liquid, ferrofluid (ferrofluid, ferrum Latin word "iron" and "fluid") or ferrofluid, is a new type of functional material, which has both liquid fluidity and Magnetic properties of solid magnetic materials.
Magnetic fluid consists of nano magnetic particles, base fluid and surfactant. Magnetic fluids often use Fe, Ni, Co, etc. as magnetic particles; use water, organic solvents, oil, etc. as base fluids; and use oleic acid as an active agent to prevent magnetic particles from agglomerating.
The fluid has no magnetic attraction when it is static, and it shows magnetism when an external magnetic field is applied. The magnetic fluid produced with nanometer metal and alloy powder has excellent performance, and can be widely used in various harsh conditions of magnetic fluid sealing, shock absorption, medical equipment, sound adjustment, light display, magnetic fluid beneficiation and other fields.
1.Magnetic Fluid Audio
Using the fluidity and magnetism of magnetic fluid, people have created magnetic fluid sound. It can convert music into different magnetic strength and diffusion range, affect the magnetic fluid material, and make it dance. With the ups and downs of the music, the ferrofluid in the speaker sometimes spreads and sometimes gathers. When the music reaches its climax, the ferrofluid will jump up with the beat of the music and put on different "poses". Doesn't it look cool? Woolen cloth?
2. Magnetic fluid clock
This kind of clock can selectively attract the magnetic fluid to specific positions by turning on or off the magnetic field to form the numbers on the clock.
3. Magnetic fluid power generation
Magnetic fluid power generation technology is based on Faraday's law of electromagnetic induction, allowing high-temperature plasma gas with a certain conductivity to pass through a magnetic field perpendicular to it at a certain speed, cutting the magnetic field lines to generate induced electromotive force, thereby generating electrical energy.
Magnetic fluid power generation is a high-efficiency, low-pollution power generation technology with the advantages of large output power and compact structure. It can directly convert heat energy into electric current without going through a mechanical conversion link, so that the fuel utilization rate can be significantly improved.
4. Magnetic fluid seal
Sealing technology is realized by using the response characteristics of magnetic liquid to magnetic field. The magnetic liquid will move in the non-uniform magnetic field under the action of the pressure difference, and generate a magnetic force against the pressure difference, so as to achieve a new balance and play a sealing role.
5. Magnetic fluid sorting plastic waste
The core of the technology for sorting plastic waste is the magnetic density separation technology, which uses the magnetic force to separate different magnetic substances. Add plastic particles into the ferrofluid, so that various particles move to a certain height in the fluid for separation, and obtain plastic particles with a specific mass and density range. This separated plastic can be reused in higher value products, improving recycling of plastic waste.
6. Defense
The U.S. Air Force introduced a radar absorbing material (RAM) made of both ferrofluid and non-magnetic substances as a paint. This material reduces the radar cross section of the aircraft by reducing the reflection of electromagnetic waves.
