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April 27, 2017

Magnetic putty comes alive and swallows a cube

Video caption:

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Magnetic putty time lapse as it absorbs a rare-earth magnet. Taken over 1.5 hours at 3fps, played back at 24fps. The magnetic putty will eventually arrange itself so that the outer surface is as evenly distributed around the magnet as possible.

Ferromagnetic particles in the putty are strongly attracted to the magnet and very slowly engulf the surface of the magnet. The magnet shown in the picture is a strong neodymium iron boron magnet. It's a very powerful magnet for its size and could erase magnetic stripes found in credit cards and damage electronics!

The putty looks and feels like regular silly putty, but the difference lies in the fact that it has been infused with millions of micron-sized ferrous particles (most often iron oxide powder). The magnetic putty is not actually magnetic by itself, since the infused particles are made of iron powder.

The presence of the strong neodymium iron boron magnet (the silver cube in the video) magnetizes the ferromagnetic particles in the putty. When this happens, the ferrous particles align with each other and this alignment generates north and south magnetic poles, making the putty into a temporary magnet. Once magnetized, the putty will remain magnetized even after the rare-earth magnet has been removed from the putty. This effect persists for a few hours until thermal agitation shakes the particles and they lose their alignment.

 

[via Reality Carnival]

April 27, 2017 at 12:01 PM | Permalink | Comments (0)

Leather Fortune Cookies

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From the website:

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With a pair of leather fortune cookies, you can keep one for yourself and share the other with a lucky friend or loved one.

Each cookie is sturdy and flexible, allowing you to repeatedly open it up and slip a message inside.

Or, put in a small stone, trinket, or talisman — there's no limit to where your imagination might take you.

Features and Details:

• Includes 8 blank paper fortune slips

• Cookie dimensions: 2.5" x 2.5" x 2"

• Un-dyed, vegetable-tanned leather

• Handmade in Denver, Colorado

• Set comes in a muslin bag

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$14.50.

April 27, 2017 at 08:01 AM | Permalink | Comments (0)

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