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Author: Subject: Video on how to make gold nanoparticles
MidLifeChemist
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[*] posted on 14-3-2023 at 09:31
Video on how to make gold nanoparticles


This video was filmed by one of my colleagues Lawton, who is getting his PhD in chemistry at the University of Florida.

https://www.youtube.com/watch?v=fVMorHYgO30

It shows how to make 3 different colors of gold nanoparticles, and why they have such amazing optical properties. It is not that difficult to do, and you don't need that much HAuCl4 so it is not too expensive to do.

Enjoy, and I hope to hear if you enjoyed the video!
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j_sum1
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[*] posted on 14-3-2023 at 17:11


Nice work. There is a clarity in this vid that I have not seen in other Au nanoparticle videos.
What is alluded to early in the video but never explained is why this phenomenon is observed with gold but not other varieties of nanoparticles.




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Osmiridium
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[*] posted on 16-3-2023 at 17:17


A very nice short and informative video about a beautiful effect! And this without the need for any chemicals difficult to obtain.
I think there might be a little bit more in depth explanation, for instance why the sodium chloride causes the particles to stick together.
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[*] posted on 2-5-2023 at 05:50


https://www.youtube.com/watch?v=snmIKpjg6Wo&t=39s

https://www.youtube.com/watch?v=m_ScOUNAdlM&t=2s

https://www.youtube.com/watch?v=1vr4OKlGwPA

https://www.youtube.com/watch?v=1vr4OKlGwPA

the second one... purple? blue??

is easy if you have the laser toy at 10k € :-)

[Edited on 2-5-2023 by pneumatician]
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Rainwater
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[*] posted on 2-5-2023 at 07:19


Would those colors keep well in sealed ampoules?



"You can't do that" - challenge accepted
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pneumatician
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[*] posted on 7-11-2023 at 15:53


Quote: Originally posted by Rainwater  
Would those colors keep well in sealed ampoules?


you need to find a different repulsive force for every Au particle or else and more easy suspend it in a jelly or hardening transparent substance. Maybe you find the perpetual motion making test :-)

Or the best is an ampoule with "nothing" inside it, only the colloidal Au. Perhaps if the ampoule is agitated the Au float a lot of time like a sand tempest.

Or more cool, makes a "sand" clock, the sand of course is colloidal Au...

try to find a substance, chemical... to make repulsive or to avoid crowding Au particles, put in a dense liquid...
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[*] posted on 11-11-2023 at 10:22


Gold colloidal, the spin of the electron particle... does it rotate clockwise or counter clockwise??? I'm far from a physics guru, but from what I understood these spins are random???

is this guy in the right path??

https://www.youtube.com/watch?v=ARjseN3vArw
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[*] posted on 11-11-2023 at 13:56


Wooow! He needs 15-20% less colloidals in his body, so it must be doing something right? Totally makes sense, all electrons spinning the same way when made in a spinning solution but in a magnetic field... Or something like that... Sure, sounds legit!
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[*] posted on 11-11-2023 at 19:56


Quote: Originally posted by j_sum1  
Nice work. There is a clarity in this vid that I have not seen in other Au nanoparticle videos.
What is alluded to early in the video but never explained is why this phenomenon is observed with gold but not other varieties of nanoparticles.

Gold has the highest electronegativity and the highest half-cell potential for first oxidation of any metal. But platinum nanoparticles can also be produced by reducing chloroplatinate with NaBH4:

https://www.mdpi.com/2079-4991/9/12/1719




[Edited on 04-20-1969 by clearly_not_atara]
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[*] posted on 17-11-2023 at 19:01


https://archive.org/search?query=Practical+Colloid+Chemistry


https://elixa.com/colloidal-silver-a-closer-look/


in this links I think anyone can find solutions.
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