Voltammetric electrodes coated with carboxyl latex particles

Aoki, Koichi; Li, Tianbao; Chen, Jingyuan; Nishiumi, Toyohiko

doi:10.1016/j.jelechem.2007.09.035

Cited by 11 publications

(10 citation statements)

References 31 publications

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“…The polystyrene/poly(acrylic acid) (denoted as PAAPS) latex was synthesized by copolymerization of styrene and acrylic acid at the loaded molar ratio, 1.0:0.076, in emulsions with the help of sodium dodecylsulfate (SDS), as has been described [25]. (Ferrocenylmethyl)trimethyl-ammonium bromide (FcTMA) was synthesized according to the bibliography [38], and was purified by re-crystallization.…”

Section: Chemicalsmentioning

confidence: 99%

“…The diameter was consistent with the value obtained from the dynamic light scattering. The suspension in a glass vessel exhibited iridescence on the wall of the vessel [25], and must form a colloidal crystal near the wall. The dried suspension on a glass plate formed a two-dimensional hexagonal arrangement, according to SEM observation [25].…”

Section: Ionic Properties Of Paaps Suspensionsmentioning

confidence: 99%

“…4a. FcTMA, possessing one positive charge, has not been taken up to the latex film in salt-rich solutions because of a loss of electrostatic attraction between (latex)-COO À and FcTMA by salt [25]. Therefore, FcTMA is not accumulated to the electrode, and thus exhibited the thickness-independence.…”

Section: Voltammetric Features Of Paaps Latex At Low Phmentioning

confidence: 99%

“…Another technique of enhancing the ion-exchange ability of PAA is to make polymers be microparticles, that is, latex particles. Latex suspensions of PAA have been used for the uptake of trimethylaminoferrocene, depending on pH and salt concentrations [25].…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, few data on physicochemical properties of PAA latex have been reported as for the dissociation equilibrium, dissociation kinetics and blocking of mass transport [15,25], to our knowledge. In order to build up PAA latexes in synthesis, it is important to get a value of pK a , pH dependence in the dissociation of the carboxyl group, permeability of ions and solvents into the latex, thickness of the chemical and electrochemical reaction zones within the latex, and the dissociation rate constant.…”

Section: Introductionmentioning

confidence: 99%

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Dissociation kinetics at polyacrylic latex-coated electrodes

Aoki

Chen

et al. 2009

Journal of Electroanalytical Chemistry

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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: Chemicalsmentioning

confidence: 99%

Section: Ionic Properties Of Paaps Suspensionsmentioning

confidence: 99%

Section: Voltammetric Features Of Paaps Latex At Low Phmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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