Determination of the surface area of silver sols based on the rate of the electrocatalytic oxidation of N,N-dimethyl-p-phenylenediamine with chloropentaamine-cobalt(III) chloride

Citation
U. Nickel et al., Determination of the surface area of silver sols based on the rate of the electrocatalytic oxidation of N,N-dimethyl-p-phenylenediamine with chloropentaamine-cobalt(III) chloride, COLL SURF A, 183, 2001, pp. 575-581
Citations number
22
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
ISSN journal
09277757 → ACNP
Volume
183
Year of publication
2001
Pages
575 - 581
Database
ISI
SICI code
0927-7757(20010715)183:<575:DOTSAO>2.0.ZU;2-Y
Abstract
The rate of the electrocatalytic reaction between N,N-dimethyl-p-phenylened iamine and the cobalt(III) complex [Co-III(NH3)(5)Cl](2+) is proportional t o the surface area of silver which acts as catalyst. For a monodisperse col loid the surface area can be calculated from the size of the particles. Thu s, a calibration line can be obtained by carrying out several measurements with the same silver sol but in different concentration. Silver sols of bot h large particles (4.6 mum diameter) and small particles (22.6 nm) were use d. These sols were prepared by reduction of silver nitrate with ascorbic ac id and borohydride respectively. The calibration line allows the determinat ion of the blank surface area of silver sols from the catalytic acceleratio n of the chosen standard redox reaction. (C) 2001 Elsevier Science B.V. All rights reserved.