The reaction of silver ion reduction involves the hydroxyl group of flavonoids.
For routine corresponds to –OH groups connected with the 3',4' carbon atoms of benzene ring B . See the formula of routine in our article. In order to stimulate the conversion of hydroxyl to quinone groups, alkalis should be added to increase the pH. Concentrations, see the articles.
B R Siddharth Your major problem is the control of the homogeneity and properties of your 'green' material (reducing agent). The usual route to synthesis of 'silver' nanoparticles is via the reduction of the silver diammine complex and thus in alkaline conditions (pH 10 or 11) as Yuri states above. For further information see this webinar:
Silver colloids and invisible ink
https://www.brainshark.com/malvern/vu?pi=560497681&b=1&tx=120486&c1=22
In my view, if you do not have ESA/XPS available then you will not be obtaining the full information your need on the 4S's of nanoparticles - size, shape, surface, solubility. For more information see my chapter called:
'Characterization of Nanomaterials' in book: Metrology and Standardization of Nanotechnology (January 2017) DOI: 10.1002/9783527800308.ch7
the incubation time for formation of silver nano particles 72 hours away from the light.
Foued Zouai Please provide a reference for your statement. Are you saying that 71 hours is not enough and 73 hours is too long?
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