my samples agglomerates and show low zeta potential after a week from the synthesis?
I use 50 ml of 1mM AgnO3 + 5 ml of bacterial supernatant ( PH adjusted to 9)
Or phosphate in the appropriate concentration - too much is as bad as too little. See the slide 44 onwards in:
Nov 11th, 2008. Dispersion and nanotechnology http://tinyurl.com/hpywsge
That will depend on the size of your nanoparticles. What you can do is to divide your nanoparticle suspension and add different amounts of a citrate solution to reach final values in the range from 5 to 50 mM.
Dear Omar
I'll suggest you, use stabilizers like sodium citrate, Polyvinylpyrrolidone (PVP), CTAB etc.
In my opinion, 50 mM sodium citrate may be used to stabilize your NPs.
Dear All,
Please forgive my ignorance and my silly questions, my major field is microbiology not nanotechnology.
Do I add the sodium citrate at the beginning along with my reducing agent and metal salt, or I add the stabilizer after the color change and in which volumes?
thank you very much.
No problem et al dear Omar.
You should add sodium citrate at beginning of the reaction, before the colour change. The volume of stabilizer used depend on the reaction mixture volume.
Dear Muhammad thanks for your input,
I have used 50 ml of AgNO3 and %ml of the reducing agent.
@Omar I believe you need to get some assistance from a chemist that understands moles and redox reactions. The description "50 mL of AgNO3" is meaningless without knowing the concentration: we need to know the number of moles of reactants employed. If you mean 5mL not %mL of the reducing agent then again we need the number of moles - it does seem you have far too much AgNO3 in relation to reducing agent but you may have a dilute solution of AgNO3 and a concentrated solution of reducing agent (although this would not be a good way of controlling the reaction).
@Alan
my AgNO3 concentration is 1mM.
my reducing agent is the supernatant I got from bacteria.
Dear Omar
Use the same concentration and volume of the stabilizing agent as AgNO3.
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