Reflectometric study of the adsorption of poly(vinyl imidazole) on a gold electrode, effects of pH, and applied potential

Journal of Colloid and Interface Science
T Roques-CarmesA Foissy

Abstract

The adsorption-desorption behavior of poly(vinyl imidazole), a weak polybase (pH-dependent positive charge), on a gold electrode was investigated using optical fixed-angle reflectometry. Using an instrument comprising an impinging-jet system, the hydrodynamic conditions were well defined, making it possible to study the adsorption rate. Comparison between the actual adsorption rate and that of a purely diffusion-controlled process revealed the occurrence and the change of an electrostatic barrier in the adsorption process. The surface charge of the gold electrode was varied by means of an externally applied potential. The surface charge density was evaluated by separate electrochemical impedance spectroscopy. The uptake and the adsorption rate were very sensitive to pH and electrode polarization. At pH 3, the adsorption of the fully charged polymer increased fairly regularly with cathodic polarization, whereas it remained at about 0.4 mg m(-2) in the anodic zone At pH 8, the adsorption of the uncharged polymer decreased with the negative charge of the electrode due to the more favorable adsorption of potassium ions on the charged electrode. Discrepancies in adsorption-desorption measurements taken while cycling the pH were due ...Continue Reading

References

Feb 19, 1998·Journal of Colloid and Interface Science·M R BöhmerG J M Koper
Nov 18, 2005·Journal of Colloid and Interface Science·Marcel GiesbersMartien A Cohen Stuart

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Citations

Aug 7, 2008·The Review of Scientific Instruments·Guoliang WangBengt Kasemo
Jun 15, 2010·Journal of Colloid and Interface Science·C PignoletC Filiâtre
Nov 4, 2008·Journal of Colloid and Interface Science·Christel Olsen, Paul R Van Tassel
Jul 18, 2015·The Journal of Prosthetic Dentistry·Lauren M BoldingElaine Romberg
Feb 16, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Jérôme DejeuAlain Foissy

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