for synthesizing silver-silica nanoparticles by sol-gel method , i have probem with it .
Please see the following article. I hope this will fulfill your requirement...
Article Enhanced electrochemical biosensing efficiency of silica par...
I have on my master. You can see details in this article: Article Organically modified silica (ORMOSIL) bearing imidazolium – ...
Lin Sun Himanshu Mishra Anna Paula Azevedo De Carvalho
Infact i would like to synthesize mesopororous silica-silver janus nano particles in free-alcohol system. To the best of my knowledge, during the process of synthesis, after adding TEOS to the solution of silver sol and CTAB , by passing 10 minutes , i can not see the white precipitation which is demonstrative of forming silica .Also, i extended the time of reaction too, but i did not make any difference apparently .
10 min is a very fast reaction when it is caralysed FOR EXAMPLE, IN A IONIC LIQUID mEDIUM rEACTION. Traditionaly the sOL-GEL silica particle even in alcohol or water medium take at least 4 hour to turn from a solution into a white dispersion. I suggest you wait more than 10 minites.
Sorry, i mean into a white coloidal dispersion. In the case other cases you can have a gel; it depends the morphology, TYPE, sYSE you whant and so on.
Xinshu Zou
in my protocol i have to add TEOS to the ctab and Ag nanoparticle solutin ,then stirr under temperature of 40 C for 10 minutes. i wonder if silica nanoparticles form or not? because i cant observe white precipitation at all .infact, i dont wanto synthesise core-shell structure ,but i want to synthesize janus nanoparticles .
In my opinion, the silica nanoparticle dispersed in the solution like sol. If you see white precipitation at the solution bottom, that you maybe synthesis the micrometer silica particle already.
- Badges
- Science topic
- Similar topics
- Chemistry
- Nanotechnology
- Nanostructured Materials
- Nanoparticles