The kinetics of polyacrylamide adsorption on polycrystalline gold
Abstract: 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 p...
| Permalink: | http://skupnikatalog.nsk.hr/Record/nsk.NSK01000716612/Details |
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| Matična publikacija: |
Croatica chemica acta 81 (2008), 3 ; str. 461-466 |
| Glavni autor: | Čamovska, Dragica B. (-) |
| Ostali autori: | Cvetkovska, Maja (-), Grčev, Toma P. |
| Vrsta građe: | Članak |
| Jezik: | eng |
| Predmet: | |
| Online pristup: |
CROATICA CHEMICA ACTA |
| LEADER | 02467caa a2200313 ir4500 | ||
|---|---|---|---|
| 001 | NSK01000716612 | ||
| 003 | HR-ZaNSK | ||
| 005 | 20180409155834.0 | ||
| 007 | ta | ||
| 008 | 091020s2008 ci ||| ||eng | ||
| 035 | |9 (HR-ZaNSK)719182 | ||
| 035 | |a (HR-ZaNSK)000716612 | ||
| 040 | |a HR-ZaNSK |b hrv |c HR-ZaNSK |e ppiak | ||
| 041 | 0 | |a eng |b hrv | |
| 042 | |a croatica | ||
| 080 | |a 54 |2 MRF 1998. | ||
| 100 | 1 | |a Čamovska, Dragica B. | |
| 245 | 1 | 4 | |a The kinetics of polyacrylamide adsorption on polycrystalline gold / |c Dragica Chamovska, Maja Cvetkovska and Toma Grchev. |
| 300 | |b Ilustr. | ||
| 504 | |a Bibliografija: 17 jed. | ||
| 504 | |a Sažetak | ||
| 520 | 8 | |a Abstract: 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 | |
| 653 | 0 | |a Zlato |a Polikristalinično zlato |a Poliakrilamid |a Difuzija |a Koeficijent difuzije |a Adsorpcija |a Kinetika adsorpcije | |
| 700 | 1 | |a Cvetkovska, Maja | |
| 700 | 1 | |a Grčev, Toma P. | |
| 773 | 0 | |t Croatica chemica acta |x 0011-1643 |g 81 (2008), 3 ; str. 461-466 |w nsk.(HR-ZaNSK)000001621 | |
| 981 | |b B09/08 |p CRO | ||
| 998 | |a rado091020 |c vol2o120830 | ||
| 856 | 4 | 2 | |u http://public.carnet.hr/ccacaa/ |y CROATICA CHEMICA ACTA |