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Autocatalytic synthesis of molecular-bridged silica aerogels with excellent absorption and super elasticity

机译：具有优异吸收和超弹性的分子桥接二氧化硅气凝胶的自催化合成

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摘要

In this study, molecular-bridged silica aerogels (MBSAs) were synthesized via supercritical CO2 liquid drying of bridged 3-aminopropyltriethoxysilane (APTES) wet gels, which were autocatalytic gelled by the catalyst- free bridging of APTES and 1,4-phthalaldehyde via a Schiff base condensation. The detailed mechanism of this facile, one-pot and autocatalytic approach for the production of MBSAs was revealed by in situ 1 HNMR and FTIRmeasurements, and the critical conditions for the successful autocatalytic gelation of the bridged- APTES were investigated. The densities and average pore diameters were in the range from 0.0535 to 0.0702 g cm~(-3) and from 12.9 to 14.1 nm, respectively. Moreover, the morphologies and thermal stability of the products were characterized by SEM and TGA, respectively. Interestingly, the MBSAs show excellent absorption performance for organic solvents, e.g., hexane, dichloromethane, kerosene, dimethylsulfoxide, tetrahydrofuran, ethanol, ethylsilicate, and N,N-dimethylformamide. Among those, 2437% by mass absorption of dichloromethane was achieved. Moreover, the absorption property of the aerogel was stable, with nearly no deterioration even after 30 absorption-desorption cycles. In addition, the aerogel showed remarkable flexibility, with the highest deformation of 90% and complete recovery after the release of stress, and it can be under through 30 cycles of compression-reversion process with 40% deformation.
机译：在这项研究中，分子桥连的二氧化硅气凝胶（MBSAs）经超临界CO 2液体干燥合成的桥连的3-氨丙基三乙氧基硅烷（APTES）湿凝胶，这是通过自动催化APTES的催化剂 - 自由桥接和凝胶化1,4-苯二醛经由席夫碱缩合。此轻便，一锅和自催化方法生产的MBSAs的详细机制通过原位1 HNMR和FTIRmeasurements显露出来，并进行了研究用于桥连APTES的成功凝胶化自催化的临界条件。密度和平均孔直径为的范围为0.0535至0.0702克厘米〜（-3），并从12.9到14.1分别纳米。此外，产品的形态和热稳定性用SEM和TGA表征。有趣的是，MBSAs显示有机溶剂，例如，己烷，二氯甲烷，煤油，二甲亚砜，四氢呋喃，乙醇，硅酸乙酯优良吸收性能，和N，N-二甲基甲酰胺。在这些，2437％的二氯甲烷的质量吸收率来实现的。此外，气凝胶的吸收性能稳定，甚至30后吸放周期几乎没有恶化。此外，气凝胶出现了显着的灵活性，以90％的应力的释放之后的最高变形和完全恢复，并且它可以是下通过用40％压缩变形的硫化返原过程的30个循环。

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  • 来源
    《RSC Advances》 |2015年第111期|共7页
  • 作者

    Yong Wei; Jin Wang; Yulu Zhang;

  • 作者单位

    School of Materials Science and Engineering Shanghai University 99 Shangda Shanghai 200444 P. R. China.;

    Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou 215123 P. R. China.;

    Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou 215123 P. R. China.;

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  • 正文语种 eng
  • 中图分类 化学;
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