论文部分内容阅读
以电石和氯仿为碳源和反应物,以二茂铁为催化剂,研究不同压力对CaC2-CHCl3体系制备碳球的形貌和结构的影响。反应设备是100mL的不锈钢高压釜,充入的氩气压力为0.5~1.5MPa,在350℃进行化学反应并保温3h,制备不同类型的碳球。采用X线衍射仪、扫描电子显微镜、透射电子显微镜和激光拉曼光谱仪等手段分析碳球的物相、形貌和结构。探讨空心碳结构的CHCl3雾化小液滴生长机理。研究结果表明:CaC2-CHCl3体系制备的碳球主要由无定形炭组成,随着压力增加,结晶程度增大。空心碳球的形成与体系压力相关,当充入压力为0.5MPa时,合成直径为100~260nm的实心无定形碳球,具有向菜花结构转变的趋势;当充入的氩气压力为1.0MPa时,合成4种不同空心碳结构,即空心毛绒碳球、角状空心碳棒、空心光滑碳球或碳棒和多边形化的空心碳球;当充入的氩气压力为1.5MPa时,合成3种不同直径范围的碳球,相同直径的碳球团聚在一起。
Using carbide and chloroform as carbon sources and reactants, ferrocene was used as catalyst to study the effect of pressure on the morphology and structure of carbon spheres prepared by CaC2-CHCl3 system. The reaction equipment is a 100mL stainless steel autoclave, filled with argon pressure of 0.5 ~ 1.5MPa, at 350 ℃ for chemical reaction and incubated for 3h, to prepare different types of carbon balls. X-ray diffraction, scanning electron microscopy, transmission electron microscopy and laser Raman spectroscopy and other means of analysis of carbon ball phase, morphology and structure. Discussion on mechanism of CHCl3 atomized droplets growth with hollow carbon structure. The results show that the carbon spheres prepared by CaC2-CHCl3 system mainly consist of amorphous carbon, and the crystallinity increases with the increase of pressure. The formation of hollow carbon spheres is related to the pressure of the system. When the pressure is 0.5MPa, the synthesis of solid amorphous carbon spheres with the diameter of 100-260nm has the tendency of changing to the cauliflower structure. When the argon gas pressure is 1.0MPa , Four kinds of hollow carbon structures were synthesized, that is hollow hollow cork balls, angular hollow carbon rods, hollow smooth carbon balls or carbon rods and polygonal hollow carbon balls. When the argon gas pressure was 1.5 MPa, Synthesis of three different diameter range of carbon balls, the same diameter carbon pellets together.