Niu Tingting, Zhou Bin, Zhang Zehui, Ji Xiujie, Yang Jianming, Xie Yuhan, Wang Hongqiang, Du Ai
School of Physics Science and Engineering, Tongji University, Shanghai 200092, China.
Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Tongji University, Shanghai 200092, China.
Nanomaterials (Basel). 2020 Dec 16;10(12):2527. doi: 10.3390/nano10122527.
Resorcinol-formaldehyde/titanium dioxide composite (RF/TiO) gel was prepared simultaneously by acid catalysis and then dried to aerogel with supercritical fluid CO. The carbon/titanium dioxide aerogel was obtained by carbonization and then converted to nanoporous titanium carbide/carbon composite aerogel via 800 °C magnesiothermic catalysis. Meanwhile, the evolution of the samples in different stages was characterized by X-ray diffraction (XRD), an energy-dispersive X-ray (EDX) spectrometer, a scanning electron microscope (SEM), a transmission electron microscope (TEM) and specific surface area analysis (BET). The results showed that the final product was nanoporous TiC/C composite aerogel with a low apparent density of 339.5 mg/cm and a high specific surface area of 459.5 m/g. Comparing to C aerogel, it could also be considered as one type of highly potential material with efficient photothermal conversion. The idea of converting oxide-carbon composite into titanium carbide via the confining template and low-temperature magnesiothermic catalysis may provide new sight to the synthesis of novel nanoscale carbide materials.
间苯二酚 - 甲醛/二氧化钛复合材料（RF/TiO）凝胶通过酸催化同时制备，然后用超临界流体CO干燥成气凝胶。通过碳化获得碳/二氧化钛气凝胶，然后通过800°C镁热催化转化为纳米多孔碳化钛/碳复合气凝胶。同时，用X射线衍射（XRD）、能量色散X射线（EDX）光谱仪、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和比表面积分析（BET）对不同阶段样品的演变进行了表征。结果表明，最终产物是纳米多孔TiC/C复合气凝胶，表观密度低至339.5 mg/cm，比表面积高达459.5 m/g。与C气凝胶相比，它也可被视为一种具有高效光热转换潜力的材料。通过限域模板和低温镁热催化将氧化物 - 碳复合材料转化为碳化钛的想法可能为新型纳米级碳化物材料的合成提供新的视角。
