Electrochemically instantaneous reduction of conducting polyaniline-coated latex particles dispersed in acidic solution

• Material Type: 文書・図像類
• Title: Electrochemically instantaneous reduction of conducting polyaniline-coated latex particles dispersed in acidic solution
• Author/Editor: CHEN, Han; CHEN, Jingyuan; AOKI, Koichi; NISHIUMI, Toyohiko
• Author Heading: CHEN, Han; CHEN, Jingyuan; AOKI, Koichi; NISHIUMI, Toyohiko
• Publication, Distribution, etc.: Elsevier Science
• Publication Date: 2008
• Publication Date (W3CDTF): 2008
• Periodical title: Electrochimica acta
• No. or year of volume/issue: 53
• Volume: 53
• Pages: 7100-7106
• Text Language Code: eng
• Subject Heading: polyaniline; suspension of redox latex particles; voltammetric diffusion-controlled current; core-shell structure; irreversibility
• Target Audience: 一般
• Note (General): A cathodic voltammetric wave was observed in an aqueous suspension of mono-dispersed, spherical polyaniline-coated polystyrene particles, whereas no anodic wave was detected. This irreversibility was common to particles with eight different diameters ranging from 0.2 to 7.5 μm. Such irreversibility cannot be found at polyaniline-coated electrodes, and thus is a property of the dispersion of polyaniline latex. The reduction current was controlled by diffusion of dispersed particles. The reduction, being the conversion from the electrical conducting state to the resistive one, should begin at a point of contact between the conducting particle and the electrode in order to be propagated to the whole particle rapidly. In contrast, the oxidation proceeds slowly with the propagation of conducting zone, during which Brownian motion lets the particle detach from the electrode. The number of loaded aniline units per particle, determined by weight analysis, ranged from 6×10_6 (φ 0.2 μm) to 3×10_11 (φ 7.5 μm) and was proportional to 2.9 powers of the particle diameter. The diffusion-controlled current of the cathodic wave was proportional to 2.4 powers of the diameter. The difference in these powers, 0.5, agreed with a theoretical estimation of the diffusion-controlled current, the diffusion coefficient for which was given by the Stokes-Einstein equation.
• Source: https://u-fukui.repo.nii.ac.jp/?action=repository_action_common_download&item_id=22172&item_no=1&attribute_id=22&file_no=1
• Access Restrictions: 限定公開
• Related Material (DOI): 10.1016/j.electacta.2008.04.084
• Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）; https://irdb.nii.ac.jp
• Original Data Provider (Database): 福井大学 : 福井大学学術機関リポジトリ