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趣味铁磁流体

2018-4-21 18:10| 发布者: dymodel| 查看: 356| 评论: 0|原作者: jason

摘要: 味铁磁流体 Fun with Ferrofluid! A blob of ferrofluid in a petri dish, with a 1 inch dia. x 1/4 inch thick NdFeB disc magnet underneath (our Item#1) A ferrofluid is a stable colloidal suspension o ...
味铁磁流体
Fun with Ferrofluid!
趣味铁磁流体
A blob of ferrofluid in a petri dish, with a 1 inch dia. x 1/4 inch thick NdFeB disc magnet underneath (our Item#1)
A ferrofluid is a stable colloidal suspension of sub-domain magnetic particles in a liquid carrier. The particles are about 100 Angstroms in size, and are coated with a surfactant to keep the particles from clumping together (even when a magnetic field is applied). By volume, a ferrofluid is about 5% magnetic solids, 10% surfactant, and 85% carrier.
When no external magnetic field is present, the magnetic moments of the particles are random, and the fluid is not magnetic.
When an external magnetic field is applied, the magnetic moments of the particles orient themselves almost instantly to the magnetic field lines of the external source. When the magnetic field is removed, the particles go back to random alignment very quickly.
Ferrofluid is used in many industrial applications. Many kinds of loudspeakers are damped with ferrofluid. If you own a CD or DVD player, the laser head most likely has a drop of ferrofluid in there to damp it. It's used in sensors and switches, and for testing magnetic audio, video and data media (floppy discs, etc.) Some new bridges in windy or earthquake-prone zones use a thicker version of ferrofluid to damp movement. When the wind starts the bridge swaying, large magnets in the structure come closer to each other, and since ferrofluid gets thicker (more dense) in a magnetic field, it stops the bridge motion.
A ferrofluid will always tend to move to the region of highest flux. This can create some VERY interesting patterns when magnets of different shapes are used!
We do offer ferrofluid and all of the magnets used in these demonstration photos for sale on our web SHOPPING CART.
趣味铁磁流体



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