Language: 
To browser these website, it's necessary to store cookies on your computer.
The cookies contain no personal information, they are required for program control.
  the storage of cookies while browsing this website, on Login and Register.

GDPR and DSGVO law

Storing Cookies (See : http://ec.europa.eu/ipg/basics/legal/cookies/index_en.htm ) help us to bring you our services at overunity.com . If you use this website and our services you declare yourself okay with using cookies .More Infos here:
https://overunity.com/5553/privacy-policy/
If you do not agree with storing cookies, please LEAVE this website now. From the 25th of May 2018, every existing user has to accept the GDPR agreement at first login. If a user is unwilling to accept the GDPR, he should email us and request to erase his account. Many thanks for your understanding

User Menu

Google Search

Custom Search

Author Topic: Magnetic sheild design  (Read 6491 times)

Floor

  • Guest
Magnetic sheild design
« on: November 14, 2013, 05:55:04 PM »
An idea I had some time ago, and also one that I have seen others express on the forum, is to use graphene as a magnetic shield.

A design using multiple and spaced layers of graphene might be better than a single layer.

Your ideas  thoughts on this.


                                               Floor

Offline gyulasun

  • without_ads
  • Hero Member
  • *****
  • Posts: 4137
Re: Magnetic sheild design
« Reply #1 on: November 15, 2013, 12:09:45 AM »
Somehow a piece of graphene sould be obtained and tested between a magnet and a soft iron piece to feel its magnetic shielding properties first. 
I am not aware of any meaningful report on that, unfortunately. Perhaps the price is high for graphene I wonder.

Another such 'promising' material has been pyrolitic graphite but its shielding properties are still too small.
http://sci-toys.com/scitoys/scitoys/magnets/pyrolytic_graphite.html
Your drawing reminds me to a slightly different setup  shown by member Tao some years ago here:
http://www.overunity.com/4172/overunity-device-using-magnets-in-the-1920s/msg80515/topicseen/#msg80515

Gyula

Floor

  • Guest
Re: Magnetic sheild design
« Reply #2 on: November 15, 2013, 01:38:33 AM »
@gyulasun

         thanks for the links

   Corrected, It should be Pyrolitic graphite.

Sony sells a variety of flexible sheets down to 25 micro meters.

Just wondering if the diamagnetizm can be increased by layering.

Offline gyulasun

  • without_ads
  • Hero Member
  • *****
  • Posts: 4137
Re: Magnetic sheild design
« Reply #3 on: November 15, 2013, 08:57:50 PM »
Hi Floor,

Yes diamagnetism can be increased by layering but the effect would still be very small i.e. flux could still penetrate strongly via the layers I am afraid.  But it should be tested of course, just order some sheets and test them, sorry that I have not done so but what I have read so far about its properties, it has not convinced me...
This link may give some more info: http://www.kjmagnetics.com/blog.asp?p=diamagnetic-levitation   
Somewhere I read (I cannot find it now) that this material (Pyrolitic graphite) behaves differently for flux coming from different directions and it has a definite orientation to give the highest diamagnetic property (but this still a small effect).

Gyula


Floor

  • Guest
Re: Magnetic sheild design
« Reply #4 on: November 16, 2013, 08:43:03 PM »
@gyulasun

I hope the sun shines brightly in Gyula today, thanks for the replys.

I also, do not find anywhere that says single layer graphene is diamagnetic.  Pyrolytic graphite is layers of graphene that have some covalent bonding between layers.

Is it  the structure / motions of the covalently shared electrons that causes the diamagnetism   ?

Would 3 layers of covalently bonding graphene be 2 x more diamagnetic or would it be less diamagnetic than 2 layers, or would it be the same.

Would there be partial cancellation of the diamagnetizm  in three layers?

Would two ,layers of graphene covalently bonding separated from two other layers of covalently bonded graphene, be more diamagnetic than if all 4 layers were bonded.

I don't have an answer to my questions.

But, I read that, pyrolytic graphite would need to be orders of magnitude more diamagnetic to be useful as a magnetic shield in an all magnet motor.


                                                cheers
                                                      floor

Offline gyulasun

  • without_ads
  • Hero Member
  • *****
  • Posts: 4137
Re: Magnetic sheild design
« Reply #5 on: November 16, 2013, 08:50:32 PM »
....

But, I read that, pyrolytic graphite would need to be orders of magnitude more diamagnetic to be useful as a magnetic shield in an all magnet motor.



I think that is the main thing which counts and this means that this material is still not what we would need for out goal.

Unfortunately I do not know the answers either for your above questions.

Thanks, Gyula