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首页> 外文期刊>Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology >Periodic mesoporous organosilica mesophases are versatile precursors for the direct preparation of mesoporous silica/carbon composites, carbon and silicon carbide materials
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Periodic mesoporous organosilica mesophases are versatile precursors for the direct preparation of mesoporous silica/carbon composites, carbon and silicon carbide materials

机译：周期性的介孔有机硅中间相是用于直接制备介孔二氧化硅/碳复合材料，碳和碳化硅材料的通用前体

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We report the direct preparation of mesoporous silica/carbon composites, mesoporous silica, and nanostructured carbon and silicon carbide materials from mesoporous ethyl-bridged organosilica/ surfactant mesophases. Well ordered mesoporous silica/carbon composites, with surface area of ca. 820 m(2) g(-1) and pore volume of 0.4 cm(3) g(-1), were obtained via pyrolysis of organosilica mesophases under argon flow at between 800 - 950 degrees C. Higher pyrolysis temperature ( 1100 degrees C) generated composites with lower porosity. Well ordered mesoporous or super-microporous silicas ( with surface area >700 m(2) g(-1) and pore volume >0.35 cm(3) g(-1)) were readily obtained from calcination ( at 550 degrees C for 8 h in static air) of the silica/ carbon composites, while porous carbons ( surface area >500 m(2) g(-1) and pore volume >0.3 cm(3) g(-1)) were generated via silica etching of the composites. The mesoporous silica/ carbon composites, mesoporous silica and mesoporous carbon materials retained the particle morphology of the organosilica mesophases. Furthermore, nanostructured and highly crystalline silicon carbide materials with high surface area (380 - 620 m(2) g(-1)) and pore volume (0.35 - 0.9 cm(3) g(-1)) were also prepared via pyrolysis of the ethyl-bridged organosilica/ surfactant mesophases at suitably high ( 1300 - 1350 degrees C) temperatures followed by calcination in air and silica etching.
机译：我们报道了由介孔乙基桥接的有机二氧化硅/表面活性剂中间相直接制备介孔二氧化硅/碳复合材料，介孔二氧化硅以及纳米结构的碳和碳化硅材料的方法。井井有条的介孔二氧化硅/碳复合材料，表面积约为。通过在800-950摄氏度之间的氩气流下通过有机硅中间相的热解获得820 m（2）g（-1）和0.4 cm（3）g（-1）的孔体积。更高的热解温度（1100摄氏度）生成具有较低孔隙率的复合材料。易于从煅烧中获得有序介孔或超微孔二氧化硅（表面积> 700 m（2）g（-1），孔体积> 0.35 cm（3）g（-1））（在550摄氏度下进行8 h在静态空气中h）的二氧化硅/碳复合材料，而多孔碳（表面积> 500 m（2）g（-1）和孔体积> 0.3 cm（3）g（-1））是通过二氧化硅蚀刻产生的复合材料。中孔二氧化硅/碳复合物，中孔二氧化硅和中孔碳材料保留了有机二氧化硅中间相的颗粒形态。此外，还通过热解制备了具有高表面积（380-620 m（2）g（-1））和孔体积（0.35-0.9 cm（3）g（-1））的纳米结构和高结晶碳化硅材料。乙桥有机硅/表面活性剂中间相在适当的高温（1300-1350摄氏度）下进行，然后在空气中煅烧和二氧化硅蚀刻。

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