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Sol-gel and nanodispersions

Printed From: Sol-Gel Gateway
Category: Sol-Gel Forum
Forum Name: Powders, Nanoparticles and Colloidal Dispersions
Forum Discription: Discussion on the Processing techniques and synthetic routes to powders, nanoparticles, and colloidal solutions.Dispersions Techniques
URL: http://www.solgel.com/sgforum/forum_posts.asp?TID=1095
Printed Date: 19 August 2019 at 6:54pm


Topic: Sol-gel and nanodispersions
Posted By: giallo
Subject: Sol-gel and nanodispersions
Date Posted: 27 January 2007 at 5:20am

Hello,

i'm an italian student. I am looking for some notions about the nanodispersions in the sol-gel process. What is the difference with the traditional sol-gel method?
Thank you all.. Greetings!
 
Gian Lorenzo



Replies:
Posted By: gertel
Date Posted: 29 January 2007 at 6:36am
Hi Jian,
Sol-gel process it is classic method and one of ways of receipt of nanomaterials. What do you want to get? Film or nanoparticles?


Posted By: giallo
Date Posted: 06 February 2007 at 9:18am

I'm interested in nanoparticles..

sincerely i don't know nothing about nanoparticles in sol-gel..i'd like to understand in which way nanoparticles can be employed in these materials.. thank you!!


Posted By: anilkumarp
Date Posted: 09 February 2007 at 6:15am
Hi giallo,

sol-gel method a material matrix (Ex SiO2) forms a large network of pores. The sizes of these pores can be tuned to be in the nanometer range. Now you have to mix the salt solution of  material (Ex any metal or oxide) of which you want to form nanoparticles into the main sol (remember much before gelling occurs) and mix them thouroughly. And allow the sol to form gel.  After this, the formed gel called precursor consists of your desired material ions are arrested into the nanopores of the matrix (SiO2). Now what is left to do is to evapourate the solvent and also reduce/oxidise the metal/oxide precursor. This can be done by heating in proper atmosphere..!!

So in short we have confined the metal/oxide crystals with in nanopores of the matrix. Hence nanosize crystals of the desired material are formed.

Hope I have been clear enough... else plz ask your questions specifically and I will try to answer..!!

anil


Posted By: rameshsiva
Date Posted: 02 March 2007 at 10:39am
hi
any one can explain me how to get clear sol and gel
i am doing sol gel process
i know that temparature and PH is important
but i dont know how to achive that temparature and PH
that is research but i cant waste chemicals please give some suggestion
 


-------------
ramesh
research scholar


Posted By: Ram007
Date Posted: 18 March 2007 at 12:02pm

hi everyone,

Greetings. I want to characterize ZnO for TEM. Can any of you suggest me a suitable solvent for dispersing ZnO?

many thanks,
Ram.


Posted By: foreverzmw
Date Posted: 18 March 2007 at 1:17pm
Hi Ram007,

just one question. I want to what your research work is about? preparation of ZnO nanoparticles or just TEM observation for ZnO? because now I want to do some work about preparation of ZnO nanoparticles by sol gel method or disperse ZnO in some kind of solvent, would you or other person here can give me some advice if you are doing the same work? Thank you!


Posted By: sk8ter
Date Posted: 03 October 2008 at 12:00pm
MEA (monoethaolamine) is very good dispersion agent for ZnO.


Posted By: drchetanpanchal
Date Posted: 20 February 2009 at 4:58pm
read some literatures and find out basic information regarding Sol -Gel. There you will find nearest compositions and processing conditions. Dr Ganguli (CGCRI) have lots of literature if you can find.


Posted By: litul Bokatial
Date Posted: 22 April 2009 at 2:04am
hello!i m a new user of this forum and for the 1st time i m using sol gel process for my sample preparation.can u plz guide me for the preparation of CdS nanoparticles.
with regards..
litul bokatial
dibrugarh university


Posted By: ctapeinos
Date Posted: 22 April 2009 at 4:51am
Dear friend

First of all i suggest that you read the book of J. Brinker about Sol-Gel. All the theory you need is in that book. Secondly because you are interested specifically in Cds i suggest your search should be focused in scientific articles that you can find in www.sciencedirect.com or more generally in scholar.google.com.


Posted By: litul Bokatial
Date Posted: 24 April 2009 at 1:14am
thanks for ur suggestion.



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