Author Topic: Zeta Potential of Silver Nanoparticles vs pH  (Read 2591 times)

Offline kephra

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Zeta Potential of Silver Nanoparticles vs pH
« on: April 06, 2013, 05:33:28 PM »
In the research paper Synthesis of silver nanoparticles using microorganisms
by Z. SADOWSKI*, I. H. MALISZEWSKA,B. GROCHOWALSKA, I. POLOWCZYK, T. KOŹLECKI is the results of testing the Zeta potential of silver nanoparticles vs pH of the solution.

The measurements show:
At pH of 2, Zeta potential is close to zero.
At pH of 4, Zeta potential is about 4 millivolts
At pH of 6, Zeta potential is about 23 millivolts
At pH of 8, Zeta potential is about 25 millivolts

Zeta potential is the electrostatic force keeping the uncapped/unstabilized silver particles from clumping together and falling out of solution.  Greater Zeta potential equates to higher stability of the colloid.
Colloidal Silver is only a bargain if you make it yourself.