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三维低对称性介孔结构模板来自四头组刚性玻拉形四级表面活性剂
Shaodian Shen1, Alfonso E Garcia-Bennett, Zheng Liu
1Department of Chemistry and Molecular Catalysis, and Innovative Materials Laboratory, Fudan University, Shanghai 200433, P.R. China.
Journal of the American Chemical Society
|May 5, 2005
概括
使用球形表面活性剂合成了具有新奇3D结构的高顺序的中等孔材料 (FDU-11,FDU-13). 这些材料具有很大的表面积和可调节的孔径,可用于催化和分离的潜在应用.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 化学 化学 化学
背景情况:
- 订购的半孔二氧化材料对于各种应用至关重要.
- 合成具有低对称性的新型3D中等孔结构具有挑战性.
- 球形表面活性剂提供独特的模板设计能力.
研究的目的:
- 合成具有四角形和正角形结构的新型3D半孔材料 (FDU-11和FDU-13).
- 研究合成材料的结构性质和特征.
- 探索这些新型半孔材料的潜在应用.
主要方法:
- 在性条件下使用刚性玻拉形四级表面活性剂 (C(3-12-12)(-)(3)) 作为模板合成中孔.
- 使用高分辨率传输电子显微镜 (HRTEM),小角度X射线散射 (SAXS) 和X射线衍射 (XRD) 的表征.
- 对N(2) 吸附异热体的分析,以确定表面积,毛孔大小和毛孔体积.
主要成果:
- 成功合成了具有原始四角形P4/mmm结构 (a=8.46 nm,c=5.22 nm) 的FDU-11和具有原始正方形Pmmm结构 (a=9.81 nm,b=5.67 nm,c=3.66 nm) 的FDU-13.
- 化FDU-11的BET表面积为~1490 m2/g,均的孔径为~2.72 nm,孔径为~1.88 cm3/g.
- 烧焦的FDU-13显示BET表面积为~1210 m2/g,均的中孔尺寸为~1.76 nm,以及~1.83 cm3/g的大孔体积.
- 观察到的低对称性归因于球形表面活性剂的形聚合和强大的静电相互作用.
结论:
- 合成了具有低对称性的四角形和正角形结构的新型3D半孔材料 (FDU-11,FDU-13).
- 这些材料的独特结构和高表面积为应用提供了新的机会.
- 这项工作扩大了中孔材料在催化,分离和纳米科学中的合成可能性.
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