Department of Chemistry, Indian Institute of Technology Ropar, Rupnagar 140 001, India.
J Colloid Interface Sci. 2011 Jun 15;358(2):399-408. doi: 10.1016/j.jcis.2011.03.012. Epub 2011 Mar 17.
A versatile route to synthesize nanoporous crystalline metal oxides has been developed through the self-assembly of phloroglucinol-formaldehyde resol and tri-block copolymer templates. Materials were characterized by a complementary combination of X-ray diffraction, nitrogen sorption, and transmission electron microscopy. Metal oxides synthesized using this route have remarkably high surface area when compared with the commercial samples. The surface area of metal oxides decreased upon calcination at higher temperatures. However, the surface area was still much higher when compared with the commercial samples. TEM investigation reveals that upon calcination at higher temperature, the size of the crystal increased but the short range order was merely disturbed. The analyses show that the present method is suitable as a direct route to synthesize crystalline nanoporous metal oxides. Hydrogen bonding plays a key role in the preferential arrangement of porous metal-carbon structure in the domain of tri-block copolymer. The nanoporous metal oxides with ordered mesoporous structure, high surface area, and crystalline framework are expected to show significant improvement in catalysis and nano-technology.
一种通过间苯三酚-甲醛树脂和三嵌段共聚物模板的自组装合成纳米多孔结晶金属氧化物的通用方法已经被开发出来。通过 X 射线衍射、氮气吸附和透射电子显微镜的互补组合对材料进行了表征。与商业样品相比，使用这种方法合成的金属氧化物具有非常高的比表面积。金属氧化物的比表面积在较高温度下煅烧时会降低。然而，与商业样品相比，它的比表面积仍然要高得多。TEM 研究表明，在较高温度下煅烧时，晶体的尺寸增大，但短程有序仅受到干扰。分析表明，本方法适合作为合成结晶纳米多孔金属氧化物的直接途径。氢键在三嵌段共聚物域中多孔金属-碳结构的优先排列中起着关键作用。具有有序介孔结构、高比表面积和结晶骨架的纳米多孔金属氧化物有望在催化和纳米技术方面表现出显著的改进。
