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Templated and Bioinspired Aqueous Phase Synthesis and Characterization of Mesoporous Zirconia

机译:模板化和生物启发的介孔氧化锆水相合成与表征

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摘要

Mesoporous zirconia has attracted great attention from the research community due to its unique properties such as high surface area, uniform pore size distribution, and large pore volume. Self-assembled structures have been used as directing agents to synthesize mesoporous zirconia. Here, we investigate the use of self-assembling block copolymers conjugated to cationic biomolecules such as lysozyme, as well as self-assembling cationic block copolymers as templates for synthesis of mesoporous zirconia in completely aqueous media. We believe this is the first report for synthesis of mesoporous zirconia in completely aqueous media with biomolecules, thereby opening up opportunities for different mechanisms for controlling zirconia synthesis. TGA was used to determine the inorganic content of the nanocomposite. XRD, nitrogen adsorption, TEM, SEM, SANS, and solid state NMR were employed to characterize the structure and composition of the samples. The results showed that zirconia nanocrystals formed after calcination of the as-synthesized nanocomposite at 500 ℃, and significant crystal growth was observed only after 900 ℃ calcination. The conjugate-templated zirconia showed a surface area of 174 m~2/g after calcination at 500 ℃, and retained its tetragonal structure even after calcining at 900 ℃. The cationic pentablock copolymer-templated zirconia showed the highest surface area, 191 m~2/g, after calcination at 500 ℃, and also demonstrated improved thermal stability. This bioinspired method can be easily scaled up and potentially used for synthesis of other oxides.
机译:介孔氧化锆因其独特的特性(例如高表面积,均匀的孔径分布和大的孔体积)而引起了研究界的广泛关注。自组装结构已被用作导向剂来合成中孔氧化锆。在这里,我们研究与阳离子生物分子(如溶菌酶)结合的自组装嵌段共聚物以及自组装阳离子嵌段共聚物作为模板在完全水性介质中合成介孔氧化锆的用途。我们相信这是在具有生物分子的完全水性介质中合成介孔氧化锆的第一份报告,从而为控制氧化锆合成的不同机制提供了机会。 TGA用于确定纳米复合材料的无机含量。 XRD,氮吸附,TEM,SEM,SANS和固态NMR用于表征样品的结构和组成。结果表明,合成的纳米复合材料在500℃煅烧后形成氧化锆纳米晶体,仅在900℃煅烧后才观察到明显的晶体生长。共轭模板氧化锆在500℃煅烧后的表面积为174 m〜2 / g,即使在900℃煅烧后仍保持其四方结构。阳离子五嵌段共聚物为模板的氧化锆在500℃煅烧后具有最高的表面积191 m〜2 / g,并具有改善的热稳定性。这种受生物启发的方法可以轻松扩大规模,并有可能用于合成其他氧化物。

著录项

  • 来源
    《Science of advanced materials》 |2013年第4期|354-365|共12页
  • 作者单位

    Ames Laboratory, U. S. Department of Energy, Ames, Iowa 50011, USA,Department of Chemical and Biological Engineering, Iowa State University, Ames, IA 50011, USA;

    Ames Laboratory, U. S. Department of Energy, Ames, Iowa 50011, USA,Department of Materials Science and Engineering, lowa State University, Ames, IA 50011, USA;

    Ames Laboratory, U. S. Department of Energy, Ames, Iowa 50011, USA,Department of Chemistry, Iowa State University, Ames, IA 50011, USA;

    Department of Chemical and Biological Engineering, Iowa State University, Ames, IA 50011, USA;

    Ames Laboratory, U. S. Department of Energy, Ames, Iowa 50011, USA,Department of Chemistry, Iowa State University, Ames, IA 50011, USA;

    Ames Laboratory, U. S. Department of Energy, Ames, Iowa 50011, USA,Department of Materials Science and Engineering, lowa State University, Ames, IA 50011, USA;

    Ames Laboratory, U. S. Department of Energy, Ames, Iowa 50011, USA,Department of Chemical and Biological Engineering, Iowa State University, Ames, IA 50011, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Mesoporous Zirconia; Bioinspired Synthesis; Templating; Aqueous Media;

    机译:介孔氧化锆生物启发的合成;模板;水性介质;

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