We Now Have The First-Ever Permanently Magnetic Liquid

Discussion in 'General Announcements' started by W9GB, Jul 19, 2019.

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  1. W9GB

    W9GB Ham Member QRZ Page

    KD0CAC likes this.
  2. KF4ZGZ

    KF4ZGZ Ham Member QRZ Page

    Isn't this how the The Cyborg Wars started?
    Somebody call Sarah Conner ......
    KD4MOJ and N1VAU like this.
  3. N2PQW

    N2PQW Ham Member QRZ Page

    That looks really clever, but not really the "First Ever" application of this concept, Magneto-rheological fluid. GM first applied this technology in 20031 to Corvette suspension damping, and has been using ever since on higher-end vehicles for on-the-fly control of shock absorber damping rates. Originally developed by Delphi, the MagneRide2 products are now produced by a Chinese firm called BWI, or Beijing West Industries.

    Anyway, thanks for posting, this is another example of how one newer technology (3D Printing) has been useful for seeding creativity in ways never expected by its originators.

    David / N2PQW

    1: https://www.motortrend.com/news/for...e-history-of-gm-magnetic-ride-control-318181/


    2: http://www.magneride.com/
    Last edited: Aug 1, 2019
    N1VAU, KM1H and KD0CAC like this.
  4. N1VAU

    N1VAU XML Subscriber QRZ Page

    I saw a magnetic liquid at the fishing counter of Kittery Trading Post earlier this year. It is used as a seal and lube for some pretty nice fishing reels.
    W1TRY likes this.
  5. WA2RZG

    WA2RZG Ham Member QRZ Page

    Hmm. Not sure how "new" this is. Maybe I'm missing something. I've been polishing glass with Magneto-rheological liquids for 10 years now.The rotary actuator feedthrough seals (Ferrofluidic Feedthrough) on our vacuum chambers have been in use for at least 25 years. Doesn't any ferrous material held in suspension have the potential to retain magnetism? Perhaps the original poster could enlighten me.

    -Jack, ars: WA2RZG
    Idex Health and Science, Optics
    Rochester NY
    Last edited: Aug 21, 2019
  6. N0TZU

    N0TZU Platinum Subscriber Platinum Subscriber QRZ Page

    The new part is that the particles can retain their magnetism when the external H field is removed. In other words they have significant remanance, and therefore have some properties similar to familiar permanent magnets. The usual ferrofluid such as used in a seal has particles too small (sub-domain size) to have significant remanance.
  7. W5LZ

    W5LZ Ham Member QRZ Page

    Is it kept in a iron bottle, and if so, how do you gt it out??
  8. G0WXU

    G0WXU Ham Member QRZ Page

    Interesting article. I can remember reading about the use in the Corvette suspension years ago but had let that slip from memory till I saw your post.
  9. KJ4YEV

    KJ4YEV Premium Subscriber QRZ Page

    Ferrofluid has been used in the magnetic gap of certain high-end loudspeakers and compression drivers for over 25 years. It serves two purposes. It helps cool the voice coil, and it raises efficiency because the voice coil is actually immersed in the magnet. Here's a link to the manufacturer:

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