Colloidal Silver and Gold Forum

Production Techniques and Chemistry => Articles -- Theory and Practice of Colloidal Silver => Topic started by: kephra on April 06, 2013, 05:33:28 PM

Title: Zeta Potential of Silver Nanoparticles vs pH
Post by: kephra on April 06, 2013, 05:33:28 PM
Zeta Potential of Silver Nanoparticles vs pH
Copyright W. G. Peters (aka kephra)

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.