Read about powder | 7 Discussions | Page 1

  1. G

    Pyrotechnic pepper spray

    Hello. Ordinary pepper sprays on the market are cans pressurized with propane, butane etc., that propells the liquid pepper through a spray nozzle. So I thought, would it be possible to make a pyrotechnic composition that act as pepper spray? Either that the burning powder itself act as a...
  2. X

    A Powder XRD sample prep question

    Hello, I have an unusual case in that I am using XRD to study plant skins before and after certain chemical treatments. So the resulting pattern will have a lot of amorphous regions but also some characteristic peaks showing the presence of fatty acids, etc. Basically I grind everything to a...
  3. Techno_Knight

    Ar (Gas) goes into spinner (Adiabatic Decompression): Power?

    Homework Statement Argo, in its gas form, is insterted into a spinner, with a rythm of 80.0 kg/min = 1.33 kg/s, temperature 800 C (= 1073.15 K), and pressure 1.50 MPa. It's decompressed adiabatically, and "escapes" the spinner with pressure 300 kPa. a) Temperature when it "escapes" ? b)...
  4. O

    Sample preparation of powders for trace metal analysis

    When preparing a fine powder for trace metal analysis, is ashing prior to digesting unnecessary? If not, or not necessarily, where could I learn more about important considerations to determine whether of not any preparation prior to digestion is required? The one instance I have come across...
  5. harborwolf

    Old bottle of "Uranium"?

    I was wondering if anyone could give me some insight as to what I found at my work the other day. We have old chemicals (some REALLY old) that turn up in random cabinets from time to time, and this time I was a bottle with a mostly-decayed label where the only thing that could be read was...
  6. R

    Magnetic powder question

    Does any kind of magnetic powder exist? I mean not iron powder, that is attracted to a magnet but vice versa, a type of powder, that when i take an iron nail or screw and get it close to that powder, the powder will attach itself to that iron object and stay there, for as long as it is not taken...
  7. R

    Ferromagnetic powder question!

    Hello! I am trying to understand a few properties of the ferromagnetic powder. I could not get the answers to these questions on the web, since any kind of phrasing i used, popped up search results that related to iron powder or ferromagnetic powder, which are manipulated and shape-shift...
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