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Author: Subject: Best way to Synthesize Zinc Sulfide
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[*] posted on 3-9-2011 at 20:30
Best way to Synthesize Zinc Sulfide


I made a video on making Zinc Sulfide (glow in the dark powder) but my results of it is actually pretty bad... only a few bits glowed and thet was from intensive lighting with a black light... the method i used was Zn + S = ZnS... but is this this the best way? im thinking of placing a Sulfide salt in HCl, make H2S gas and bubble it though a Soluble Zinc compounds (sulfate for example... this would produce ZnS + H2SO4 if im correct) Would the Sulfuric Acid produce react with the Zinc Sulfide produced? is this a good way on making a good batch of glow in the dark powder or is there a better way to get zinc sulfide?

Below is my Zinc Sulfide Video

http://www.youtube.com/watch?v=9zEDtYPcAjc




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blogfast25
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[*] posted on 4-9-2011 at 04:44


By your own admission your stuff is heavily contaminated. Your initial mix didn't even look particularly well mixed to me. Permanganate/glycerol introduced more contamination.

I believe there are some threads on this forum on ZnS. Search and yee shall find!

It can also be made by precipitating it from a Zn2+ solution with a water soluble sulphide. Maybr that's easier to control than a flash powder? The 'wet method' requires good control of pH, otherwise your product will hydrolyse (redissolve).


[Edited on 4-9-2011 by blogfast25]




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[*] posted on 4-9-2011 at 04:52


Why not merging those threads? The topic is essentially the same.



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blogfast25
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[*] posted on 4-9-2011 at 04:55


http://www.sciencemadness.org/talk/viewthread.php?tid=9490#p...

... for starters.




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AJKOER
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[*] posted on 7-9-2011 at 18:51


One cited preparation of ZnS is by passing H2S into a buffered zinc salt solution adjusted to a pH of 3. It forms a white precipitate.

Example:

ZnCl2 + H2S --> 2 HCl + ZnS (s)
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[*] posted on 7-9-2011 at 19:45


How do i control the pH? i dont have anything to use? I thought Zinc Sulfide was Yellow?



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[*] posted on 7-9-2011 at 21:15


Quote: Originally posted by Chemistry Alchemist  
How do i control the pH? i dont have anything to use? I thought Zinc Sulfide was Yellow?


http://en.wikipedia.org/wiki/Zinc_sulfide

"Zinc sulfide is a white to yellow-colored powder or crystal."

You really need to spend more time doing research. It will save you much unneeded work and questions.

Forgot to add but study adding silver as an activator to make some nice scintillation screens for Gamma radiation. Old tech but cool to watch in the dark.


[Edited on 9-8-2011 by IrC]




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[*] posted on 7-9-2011 at 23:14


Yeah i apologise about that, soon after i posted it, i went onto wiki ans read about it, i spend ALOT of time doing research actually, sometimes doing it all day just on one topic




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[*] posted on 8-9-2011 at 09:29


Quote: Originally posted by Chemistry Alchemist  
Yeah i apologise about that, soon after i posted it, i went onto wiki ans read about it, i spend ALOT of time doing research actually, sometimes doing it all day just on one topic


I would suggest expanding you research beyond the back
of cereal box's, and searching in a language which you are
proficient in.


1 — Try these
http://tinyurl.com/Zink-sulphide-Popular-Science
http://tinyurl.com/Zink-sulphide-Henry
2 — Put your check in the mail please.
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[*] posted on 19-9-2011 at 03:40


I would mix stoichiometric amounts of sulfur and zinc and put it in a test tube. Heat for about 10 minutes so that the sulfur melts and reacts with the zinc.
It could be quite dangerous if the mixture ignites though.




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[*] posted on 19-9-2011 at 11:58


Quote: Originally posted by TheNaKLaB  
I would mix stoichiometric amounts of sulfur and zinc and put it in a test tube. Heat for about 10 minutes so that the sulfur melts and reacts with the zinc.
It could be quite dangerous if the mixture ignites though.

That's odd because I'd not try heating a mixture fairly commonly used as rocket fuel in a glass container.
Once the reaction starts it will ignite- rather vigorously

I'd prefer this sort of thing
http://www.naasjournal-ng.org/files/2009/pdf/239-244(vol10_no3_2009).pdf
though I accept that you need to be careful with the thiourea.
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[*] posted on 19-9-2011 at 12:39


Quote: Originally posted by unionised  
That's odd because I'd not try heating a mixture fairly commonly used as rocket fuel in a glass container.
Once the reaction starts it will ignite- rather vigorously



An expendable ceramic teacup or similar, embedded in (a small bucket of) dry sand, will do. Thermal shock will crack the 'crucible' but won't (obviously) melt it, Gently prize it out of the sand and recover the product. That's how I do all my thermites.




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TheNaKLaB
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[*] posted on 19-9-2011 at 21:22


I've done this experiment many times and had much success. Zinc and Sulfur don't spontainasly combust like flash powder, but act more like a thermite reaction.





[Edited on 19-09-2011 by TheNaKLaB]




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