Chromatography - 19-12-2013 at 15:07
Hello all I used to post on this site under the user name Trifluoroacetic.
I've been spending my time synthesizing Nanoprticles and taking UV/VIS measurements.
So far I have produced the following NP's:
Selenium NP's in chitosan
Gold NP's in chitosan
Gold NP's in PEI
Silver NP's via hydrazine reduction
I have plans to make core shell nanoparticles, SiO2 NP's, Quantum Dots, etc.
Attachment: phptP9xgm (59kB)
This file has been downloaded 632 times 
Chromatography - 19-12-2013 at 15:09
Here are more of the NP's that I have made.
Chromatography - 19-12-2013 at 15:14
Here is the UV/VIS Spectra for chitosan capped AuNP's
[file]28137[/file]
bfesser - 19-12-2013 at 16:08
Why the new user account?
Chromatography - 19-12-2013 at 16:31
I forgot my old password and couldn't sign in.
bfesser - 19-12-2013 at 16:37
U2U woelen, vulture, or Polverone. I'm sure that they can reset your password if you can verify
your identity.
Fantasma4500 - 20-12-2013 at 09:25
once managed to make 1.5L of silver nanoparticles, as in divided in 1.5 litres of water..
think i used syrup on some silver salt, but ofcourse this might count as adding impurities which might be hard to seperate out..
TheChemiKid - 20-12-2013 at 09:31
How much sliver was in this suspension?
I would appriciate it if you could elaborate on the procedure.
Fantasma4500 - 20-12-2013 at 09:50
im 100% unsure infact..
it could be either AgNO3 or AgCl2..
i cant really find video that used to describe the process, apparently the solution had to start kinda boiling and then the silver would ppt out
but im quite sure it was AgNO3 and syrup i used for it.. glucose should work aswell, because thats the stuff in syrup used for the reaction
anyhow, when i let the bottle stand around for long periods of time i can get a mm of ppt silver (pitch black) settling on the botom, its somewhat
dark, very brown, i doubt you can see through it especially as it was just tumbled about a day ago..
Metacelsus - 20-12-2013 at 09:53
Reducing silver salts with glucose may not give nano-sized particles. What were the specific conditions you used?
Chromatography - 20-12-2013 at 12:55
I've had good success with using 1mM of AgNO3 in distilled water with hydrazine sulfate approx 1% at 1-2mL. The hydrazine will reduce and stabilize
the AgNP's. The NP's are black when concentrated but yellow when diluted.
Adding a capping agent like chitosan, PVP or PVA will keep the particles from agglomerating.
Fantasma4500 - 21-12-2013 at 08:32
well, im completely unable to catch any of the particles using a filter (which is on average 1µm) and they stay in suspension for many months, if not
nanoparticles then at least quite small ^^
Mildronate - 21-12-2013 at 12:38
There was days when it was just colodial chemistry not super duper nanomaterials 
Chromatography - 21-12-2013 at 13:17
What is the color of your silver NP's when diluted?