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首页> 外文期刊>RSC Advances >Effect of nanoporous structure and polymer brushes on the ionic conductivity of poly(methacrylic acid)/anode aluminum oxide hybrid membranes
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Effect of nanoporous structure and polymer brushes on the ionic conductivity of poly(methacrylic acid)/anode aluminum oxide hybrid membranes

机译：纳米多孔结构和聚合物刷对聚（甲基丙烯酸）/阳极氧化铝杂交膜离子电导率的影响

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摘要

Anode aluminum oxide (AAO) porous materials have been widely used in ionic translocation for many biological and chemical studies. However, the lack of stimuli-response of this material limits its applications for the precise control of ionic transportation by the external environment. In this study, we functionalized the internal nanopores of AAO membranes to generate polyelectrolyte-filled pH-responsive membranes whose ionic conductivity could be readily controlled by changing the pH value. AAO membranes with different pore sizes (25, 75 and 100 nm) were modified with poly(methacrylic acid) (PMAA) by a "grafting-to" approach. Thermogravimetric and SEM analysis revealed that the extent of PMAA infiltration strongly depends upon the relative sizes of the nanopores and the PMAA concentration. Increasing the size of the nanopores enables the infiltration of PAA solution with a higher concentration. Electrochemical impedance spectroscopy demonstrated that the membrane conductivity decreases from 7.87 x 10(-4) S cm(-1) at pH 1 to 5.72 x 10(-5) S cm(-1) at pH 7. The functionalized AAO nanopores showed significant sensitivity to pH value, whereas a valve effect was observed in the pH range between 4 and 5. Our fabricated PMAA-AAO membranes show promising potential to be used as pH sensors and smart valves in micro-/nano-total analysis chips for biomedical and chemical applications.
机译：阳极氧化铝（AAO）多孔材料已广泛用于许多生物和化学研究的离子易位中。然而，缺乏这种材料的刺激反应限制了其在外部环境中精确控制离子运输的应用。在这项研究中，我们用AaO膜的内部纳米孔官能化，以产生聚电解质填充的pH-响应膜，其通过改变pH值可以容易地控制离子电导率。用“嫁接至”方法用聚（甲基丙烯酸）（PMAA）改性具有不同孔径（25,75和100nm）的AaO膜。热重分析和SEM分析表明，PMAA浸润的程度强烈取决于纳米孔的相对尺寸和PMAA浓度。增加纳米孔的尺寸使得能够以更高的浓度渗透PAA溶液。电化学阻抗光谱证明膜电导率在pH7的pH 1至5.72×10（-5）Scm（-​​5）的7.87×10（-4）Scm（-​​1）下降。官能化AaO纳米孔显示出显着对pH值的敏感性，而在4和5的pH范围内观察到阀效应。我们制造的PMAA-AAO膜显示有希望用作Micro-/纳米总分析芯片的pH传感器和智能阀的生物医学和化学应用。

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  • 来源
    《RSC Advances》 |2015年第86期|共7页
  • 作者

    Chen Feng; Jiang Xiaoping; Kuang Tairong; Chang Lingqian; Fu Dajiong; Yang Zhaogang; Yang Jintao; Fan Ping; Fei Zhengdong; Zhong Mingqiang;

  • 作者单位

    Zhejiang Univ Technol Coll Mat Sci &

    Engn Hangzhou 310014 Zhejiang Peoples R China;

    Zhejiang Univ Technol Coll Mat Sci &

    Engn Hangzhou 310014 Zhejiang Peoples R China;

    Ohio State Univ NSEC Ctr Affordable Nanoengn Polymer Biomed Devic Columbus OH 43210 USA;

    Ohio State Univ NSEC Ctr Affordable Nanoengn Polymer Biomed Devic Columbus OH 43210 USA;

    Ohio State Univ NSEC Ctr Affordable Nanoengn Polymer Biomed Devic Columbus OH 43210 USA;

    Ohio State Univ NSEC Ctr Affordable Nanoengn Polymer Biomed Devic Columbus OH 43210 USA;

    Zhejiang Univ Technol Coll Mat Sci &

    Engn Hangzhou 310014 Zhejiang Peoples R China;

    Zhejiang Univ Technol Coll Mat Sci &

    Engn Hangzhou 310014 Zhejiang Peoples R China;

    Zhejiang Univ Technol Coll Mat Sci &

    Engn Hangzhou 310014 Zhejiang Peoples R China;

    Zhejiang Univ Technol Coll Mat Sci &

    Engn Hangzhou 310014 Zhejiang Peoples R China;

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