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Control of graphene aerogel self-assembly in strongly acidic solution via solution polarity tuning

机译：通过溶液极性调谐控制强酸性溶液中石墨烯气凝胶自组装

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摘要

In view of their advantages (plasticity, low density, adjustable pore size, high porosity of >99.9%), three-dimensional graphene aerogels (GAs) are widely used for energy storage and adsorption separation, which has inspired the development and optimization of the corresponding synthetic techniques. In particular, self-assembly in the liquid phase features the benefits of tunability and sustainability and is viewed as a promising strategy of GA synthesis. During hydrothermal GA preparation, hydrophilic graphene oxide (GO) gradually turns lipophilic upon reduction, and the resulting phase transition separation and polarity change induce self-assembly into an aerogel. However, the effect of solution polarity on the structure or state of dispersed GO nanosheets, which affects the final property-determining process of automatic assembly, is still unclear. Herein, we prepared a series of GAs by hydrothermal reduction of unwashed GO with vitamin C in liquid-phase systems of different polarity and investigated the effects of polarity on the self-assembly process and aerogel properties using a range of instrumental techniques. The results showed that GO reduction is slowed down in weakly polar systems and further demonstrated that the shape of partially reduced graphene oxide (rGO) flakes depends on solution polarity. Flaky, layered, and stacked rGO particles obtained in strongly polar media self-assembled into anisotropic gully aerogels that were brittle and almost completely inelastic. Conversely, in weakly polar media, the prepared rGO sheets were twisted, which increased the number of contact points and modes between sheets and resulted in self-assembly into uniform-pore-structure honeycomb aerogels that showed good elasticity and could be repeatedly compressed.
机译：鉴于其优点（可塑性，低密度，可调节的孔径，高孔隙率> 99.9％），三维石墨烯气动凝胶（气体）广泛用于储能和吸附分离，这激发了开发和优化的启发相应的合成技术。特别是，液相中的自组装具有可调性和可持续性的好处，并且被视为GA合成的有希望的策略。在水热GA制剂期间，亲水石墨烯氧化物（GO）在减少时逐渐转动亲脂性，并且所得到的相变分离和极性变化将自组装诱导到气凝胶中。然而，溶液极性对分散的去纳米片的结构或状态的影响，这影响了自动组件的最终性能 - 确定过程，仍然不明确。在此，我们通过在不同极性的液相系统中使用无洗涤的WATHASHED的WATHASHED GOW的水热量减少制备了一系列气体，并使用一系列仪器技术研究了极性对自组装过程和气凝胶性能的影响。结果表明，在弱极性系统中降低了减少，并进一步证明了部分还原的石墨烯（RGO）薄片的形状取决于溶液极性。在强极介质中获得的片状，分层和堆叠的RGO颗粒自组装成脆性和几乎完全无弹性的各向异性GULLY Aerogels。相反，在弱极性介质中，制备的RGO片材扭曲，增加了片材之间的接触点和模式的数量，并导致自组装成均匀孔隙结构蜂窝气凝胶，其显示出良好的弹性，并且可以重复压缩。

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  • 来源
    《RSC Advances》 |2019年第37期|共9页
  • 作者

    Huang Jinhui; Huang Xue; He Ming; Zhang Buning; Feng Guangzhu; Yin Guoqiang; Cui Yingde;

  • 作者单位

    Northwestern Polytech Univ Sch Mat Sci &

    Engn Xian 710072 Shaanxi Peoples R China;

    Zhongkai Univ Agr &

    Engn Guangzhou Key Lab Efficient Utilizat Agr Chem Guangzhou 510225 Guangdong Peoples R China;

    Zhongkai Univ Agr &

    Engn Guangzhou Key Lab Efficient Utilizat Agr Chem Guangzhou 510225 Guangdong Peoples R China;

    Zhongkai Univ Agr &

    Engn Guangzhou Key Lab Efficient Utilizat Agr Chem Guangzhou 510225 Guangdong Peoples R China;

    Zhongkai Univ Agr &

    Engn Guangzhou Key Lab Efficient Utilizat Agr Chem Guangzhou 510225 Guangdong Peoples R China;

    Zhongkai Univ Agr &

    Engn Guangzhou Key Lab Efficient Utilizat Agr Chem Guangzhou 510225 Guangdong Peoples R China;

    Northwestern Polytech Univ Sch Mat Sci &

    Engn Xian 710072 Shaanxi Peoples R China;

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  • 中图分类 化学;
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