Shear Thickening Fluid Armour - Poject Idea

  • Thread starter _Greg_
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http://www.che.udel.edu/research_groups/wagner/website/awards_files/ADVANCED%20BODY%20ARMOR%20UTILIZING%20SHEAR%20THICKENING%20FLUIDS-Army%20conference%202002.pdf [Broken]

I found a Recipe Book! :surprised

I got the ethanol ratio Finnaly. Im a bit worried about the thickening fluid now, i think it has too be nano and i dont think there is nano particles on Ebay. I have yet too get a Conformation from the STF seller.
Yeah I would beware of that ebay stuff as it is just Corn Starch I truly believe because it uses water and by the way it looks. The Corn Starch has the same effect but due to it being perishable it spoils if sat for a while. That's why the other stuff is better.

Note the thing about it being nano is the purpose of having the silica small enough to sink into the fabric. Any bigger would just coat the fabric. I hear PMMA powder can be used also. Also if your gonna buy Silica note that if you by from Asia it's gonna be expensive with just shipping alone. Below are a few American sites.


http://www.americanelements.com/sioxnp.html

http://www.glantreo.com/custom_particle_synthesis.php [Broken]

http://www.microspheres-nanospheres.com/Microspheres/Size standards/Silica size standards.htm
 
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PMMA powder is Nano size particles?? you think i can find PMMA powder or Nano Silica in a local Chemistry Supply store?

how costly can it be ordering online? i dont wanna have too get a crate of the stuff just too use a cup of it.
 
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I'm also doing the same kind of project.What is your current progress. i have the nanosilica particles, but it is in kind of liquid foam,so if u have experiment it , did u use powder or the liquid
 
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I am still trying too find nano silica powder im afraid, every company ive found so far only sells too university's or factory's for Liability reason's. I would use powder instead of foam because its what the army used. Where did you Find the Nano Silica Foam, never heard of such a thing. Considering i cant find powder i may wanna try the Foam.
 

ICU

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You should try talking to a local university professor in either the chemistry/textile/engineering departments and see if you can collaborate with them a little on your research. That way they could order the stuff you need through the university, and be a source of information.

Best of luck!
 
Fumed Silica is used commonly to thicken products. An industry workhorse is Aerosol 200 from Degussa. It has a primary crystal size of 7 nm. To make it work properly you need to mix it with high shear to disperse it properly. For this you need a homogenizer or high speed mixer. A stick blender might do the job. Proper dispersal will make a big difference to the thickening properties of this mixture.

Pretty sure silica/water mixture liquifiy under shear; the opposite of what you want. Maybe silica/glycols are different.

Nano silica foam is Aerogel isn't it? Made from sio2 condensation of tetraethylorthosilicate.
 
A stick blender might do the job. Proper dispersal will make a big difference to the thickening properties of this mixture.

Pretty sure silica/water mixture liquifiy under shear; the opposite of what you want. Maybe silica/glycols are different.

Nano silica foam is Aerogel isn't it? Made from sio2 condensation of tetraethylorthosilicate.
I been think of doing a project along these lines to. You could get Lumira® Aerogel granules put that in blender. Plus there something that is harder then glass... And you can buy in 500 nm or less diamond powder! Do you guys think it would work? Or is just glass that works in work in the gel
 
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Gosh, i sure hope this thread is still active.

Hey, i was interested in creating some STF too. Where can i purchase Silicon dioxide( Silica Power), ethylene glycol, and ethanol. Is Diatomaceous Earth a good source of silica powder? Depending on the brand it can be 80 to 90% silica. Would these attributes suffice considering that the other 10% is Alumina and Iron Oxide? I am not sure that the silica particles would be small enough considering it is just crushed micro organism fossils. Would a better source of silica be women's make-up? I read somewhere that certain types contain it.

But an even better source would be a professional chemical distribution company. If you know of any it would be of great help.
 
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Hi

The STF is made up of silica particles (400-500nm) mixed with ethylene glycol, which is then diluted with ethanol for easier absorbtion into the kevlar.
Interesting to find someone doing experiments. I was also thinking about making liquid armor but I have problem finding silica nanoparticles in my country. But I did find silica dioxide powder but it's particle size is 3000-4000nm. Would these particles work enough effectively? Don't want to risk buying 10kg bag if it's useless. Here's link to product: http://www.topplastas.lt/?id=4&cat=9

I guess any liquid medium could be used but PEG is more stable and take temperature extremes. Maybe antifreeze or even oil would work.
 

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