In my case am going to synthesis metal oxides.which capping agent is suitable for metal oxides? Is capping agents are material dependent ?
Dear,
Capping agents cover the refine surface of nanoparticles and prevent them from coagulation or aggregation. For metal oxide use CTAB or Twin 80 as surfactant.
Dear,
Capping agents cover the refine surface of nanoparticles and prevent them from coagulation or aggregation. For metal oxide use CTAB or Twin 80 as surfactant.
Zinc oxide nanoparticles were synthesized using chemical method in alcohol base. During synthesis three capping agents, i.e. triethanolamine (TEA), oleic acid and thioglycerol, were used and the effect of concentrations was analyzed for their effectiveness in limiting the particle growth.
http://www.sciencedirect.com/science/article/pii/S002223130900088X
may give some idea
Dear panneer, yes capping agents are material dependent,even selection capping agent depend on the method of synthesis,nature of metal oxide, and conditions you are going to apply also,but in your case use of CTAB,TITRON X-100,PVP OR POLYOLS will be the right choice, capping agent more probably increases stability of NP'S ,dec aggregation, keeping NP away from one another,even it effects morphology and size of NP .I suggest you to study some publications related to your question may it will help you better.
Dear Panneer,Capping agent is always used in form of solution, solvent is mostly D.I water but other can also be used, just it should be noted that solvent used must remove easly after formation of nanoparticles.
Regard.
Muhammad Imran khattak
Capping agents/ligands are needed to control nanoparticle growth and agglomeration during synthesis.
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