Size-dependent efficiency of electron transfer at suspended ferrocenyl jumbo particles

et al. 2009

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a b s t r a c tPolystyrene/poly(acrylic acid) latex particles 0.26 lm in diameter, which were synthesized by emulsion copolymerization of styrene and acrylic acid, were immobilized on the platinum electrode in a uniform film. The film did not block the diffusion current of a ferrocene derivative in the solution. The voltammograms showed the reduction of hydrogen ion, which was supplied not only from the solution but also from the dissociation of carboxyl acid of the adsorbed latex. The peak currents at pH less than 4.5 were proportional to the thickness of the latex film, and were supplied by dissociation from the latex. In contrast, those at pH more than 5.5 were independent of the film thickness, and were controlled by the dissociation kinetics of the carboxyl acid within the first particle layer. Expressions for the voltammetric currents with the CE mechanism were derived theoretically. The theory predicts that the reaction rate constant can be evaluated from the lower deviation from the proportionality of the peak currents to scan rates, as in consistent with the experimental results. The rate constant was by one order smaller than the homogeneous rate constant of acrylic acid. pH-Titration demonstrated the electrostatic interaction of -COO À , like in self-assembled carboxylate films. The average concentration of carboxylate in the latex was ca. 2.7 M. The dissociation was limited to the surface domain of the latex.

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Section: Introductionmentioning

confidence: 99%

Dissociation kinetics at polyacrylic latex-coated electrodes

et al. 2009

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“…The surface was so rough that solution can penetrate into the inside of the particle. The high penetration of big ions in polystyrene latex has been demonstrated by the proportionality of the amount of the incorporated ferrocenyl derivative with the volume of latex particles [11].…”

Section: Properties Of Paps Latex Suspensionmentioning

confidence: 99%

“…(11) indicates that x can be evaluated from experimentally accessible values of pH, c S and c F , except for K. Numerical values of x/c F in Eq. (11) were obtained by means of Newton's method on the assumption of K = 2.75 · 10 À5 M for acetic acid.…”

Section: Thermodynamic Formulationmentioning

confidence: 99%

“…Potential cycling of polypyrrole latex has varied a degree of adsorption of imidazole [8]. Ferrocene-immobilized latex particles have brought about the partial electron transfer depending on the particle size [9][10][11]. Polyaniline-latex particles have allowed us to estimate a relationship between adsorption force and a degree of the electrode reaction [12].…”

Section: Introductionmentioning

confidence: 99%

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Voltammetric electrodes coated with carboxyl latex particles

et al. 2008

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“…In order to determine concentrations of droplets, voltammetric currents should be related quantitatively with concentrations of droplets, droplet size and redox concentrations. From the electrochemical viewpoint, oil droplets containing redox species resemble suspended redox latex particles such as hydrogen ion in polystyrene latex [43], polyaniline-coated polystyrene [44][45][46], ferrocenyl derivatives on polystyrene [47,48], and polyacrylic acid-polystyrene latex [49]. Redox latex particles react at electrodes by releasing redox moieties [43,47], propagating redox reactions in the latex particles [44][45][46], letting redox moieties diffuse in the latex particles [48] or contacting the spherical surface with electrodes [49,50].…”

Section: Introductionmentioning

confidence: 99%

Voltammetric determination of concentrations of ferrocene-included nitrobenzene droplets in water

et al. 2011

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