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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^\u003c-\u003e, like in self-assembled carboxylate films. The average concentration of carboxylate in the latex was ca 2.7 M. 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Dissociation kinetics at polyacrylic latex-coated electrodes
http://hdl.handle.net/10098/2349
http://hdl.handle.net/10098/2349dc580398-58bf-40dc-8bd4-240194e3e91e
名前 / ファイル | ライセンス | アクション |
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CE_latex1.pdf (291.5 kB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2010-01-13 | |||||
タイトル | ||||||
タイトル | Dissociation kinetics at polyacrylic latex-coated electrodes | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | polyacrylic latex-coated electrodes | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | voltammetric CE mechanism | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | electrostatic interaction | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | theoretical analysis | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_1843 | |||||
資源タイプ | other | |||||
著者 |
LI, Tianbao
× LI, Tianbao× AOKI, Koichi× CHEN, Jingyuan× NISHIUMI, Toyohiko |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Polystyrene/poly(acrylic acid) latex particles 0.26 μm 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^<->, 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. | |||||
書誌情報 |
Journal of Electroanalytical Chemistry 巻 633, 号 2, p. 319-326, 発行日 2009-12 |
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出版者 | ||||||
出版者 | Elsevier B.V. | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 220728 | |||||
書誌レコードID | ||||||
識別子タイプ | NCID | |||||
関連識別子 | TD00006729 | |||||
著者版フラグ | ||||||
出版タイプ | AO | |||||
出版タイプResource | http://purl.org/coar/version/c_b1a7d7d4d402bcce |