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The Kinetics of Polyacrylamide Adsorption on Polycrystalline Gold

Dragica Chamovska ; Faculty of Technology and Metallurgy, »St. Cyril and Methodius« University, Skopje, R. Macedonia
Maja Cvetkovska ; Faculty of Technology and Metallurgy, »St. Cyril and Methodius« University, Skopje, R. Macedonia
Toma Grchev ; Faculty of Technology and Metallurgy, »St. Cyril and Methodius« University, Skopje, R. Macedonia

Puni tekst: engleski, pdf (228 KB) str. 461-466 preuzimanja: 774* citiraj
APA 6th Edition
Chamovska, D., Cvetkovska, M. i Grchev, T. (2008). The Kinetics of Polyacrylamide Adsorption on Polycrystalline Gold. Croatica Chemica Acta, 81 (3), 461-466. Preuzeto s https://hrcak.srce.hr/31134
MLA 8th Edition
Chamovska, Dragica, et al. "The Kinetics of Polyacrylamide Adsorption on Polycrystalline Gold." Croatica Chemica Acta, vol. 81, br. 3, 2008, str. 461-466. https://hrcak.srce.hr/31134. Citirano 06.03.2021.
Chicago 17th Edition
Chamovska, Dragica, Maja Cvetkovska i Toma Grchev. "The Kinetics of Polyacrylamide Adsorption on Polycrystalline Gold." Croatica Chemica Acta 81, br. 3 (2008): 461-466. https://hrcak.srce.hr/31134
Harvard
Chamovska, D., Cvetkovska, M., i Grchev, T. (2008). 'The Kinetics of Polyacrylamide Adsorption on Polycrystalline Gold', Croatica Chemica Acta, 81(3), str. 461-466. Preuzeto s: https://hrcak.srce.hr/31134 (Datum pristupa: 06.03.2021.)
Vancouver
Chamovska D, Cvetkovska M, Grchev T. The Kinetics of Polyacrylamide Adsorption on Polycrystalline Gold. Croatica Chemica Acta [Internet]. 2008 [pristupljeno 06.03.2021.];81(3):461-466. Dostupno na: https://hrcak.srce.hr/31134
IEEE
D. Chamovska, M. Cvetkovska i T. Grchev, "The Kinetics of Polyacrylamide Adsorption on Polycrystalline Gold", Croatica Chemica Acta, vol.81, br. 3, str. 461-466, 2008. [Online]. Dostupno na: https://hrcak.srce.hr/31134. [Citirano: 06.03.2021.]

Sažetak
Fast potential step measurements (0.9 ® 1.9 ® 0.9 V, E vs. she) with simultaneous monitoring
of the double layer capacity were applied in the study of the kinetics of PAA adsorption on
gold from 0.5 M H2SO4, at 293 K. It was shown that the addition of PAA to the solution at 1.9 V
(in the presence of a very thin oxide layer at the gold surface of  1 nm) does not affect the
value of the capacity of the Au/Au2O3/PAA-solution interface, which was also confirmed by
Electrochemical Impedance Spectroscopy. After the very fast cathodic reduction of the thin oxide
layer (step 1.9 ® 0.9 V) for several milliseconds, the initial adsorption of PAA molecules
at the bare gold surface reappeared in approx. 10 ms, causing exhaustion of the metal/solution boundary
layer. The induction region (dq/dt = 0) as well as the diffusion controlled region (dq/dt =
const. = f Mn((PAA); cPAA) are characteristic of low concentrations in the solution. According
to the experimentally obtained linear parts of the (q / logt)-dependences, values of the diffusion
coefficient of PAA-molecules with different molecular weights were calculated. These values follow fairly well the empirical equation: DPAA = 7.03 × 10–4 Mn–0.66 cm2 s–1. Using the same procedure, the diffusion coefficient of 9 × 10–6 cm2 s–1 for adsorption of »small« organic molecules,
such as HMBT, was calculated.

Ključne riječi
potentiostatic pulses; adsorption kinetics; polyacrylamide; polycrystalline gold

Hrčak ID: 31134

URI
https://hrcak.srce.hr/31134

Posjeta: 1.151 *