CaC_2-CHCl_3体系制备纳米碳球的反应热力学  

Reaction thermodynamics of carbon nanospheres prepared by CaC_2-CHCl_3 system

作　　者：尹彩流[1,2] 文国富[2] 黄启忠[3] 黄天星[2] 刘宝容[1] 

机构地区：[1]广西大学有色金属及材料加工新技术教育部重点实验室,500004 [2]广西民族大学物理与电子工程学院,南宁530006 [3]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2011年第2期175-179,共5页Materials Science and Engineering of Powder Metallurgy

基　　金：广西大学有色金属及材料加工新技术教育部重点实验室开放基金资助项目(GXKFJ-18);国家重点基础研究发展计划(973计划)资助项目(2006CB600901);广西科学基金资助项目(桂青科0991015);广西教育厅项目(200808MS083)

摘　　要：利用CaC2-CHCl3体系反应合成纳米碳球,利用X射线衍射仪（XRD）和扫描电镜（SEM）对产物的物相、形貌和显微结构进行分析。对该体系进行吉布斯自由能和反应热效应计算,结合实验结果,研究采用无机化学反应法制备微纳米碳球的中间态成碳机理。结果表明：从理论上证实CaC2-CHCl3体系热解产物可能为石墨、金刚石和C3原子气;标准状态（298 K）下CaC2-CHCl3体系的吉布斯自由能、反应热效应和绝热温度分别为？1 847.5 kJ/mol、？1 945.5 kJ/mol和6 184 K;C3原子气是低温反应条件下无机碳源制备纳米碳球的中间态碳源前驱体。用CaC2-CHCl3体系可制备最大直径200-300 nm左右的碳球。Carbon nanospheres were prepared via CaC2-CHCl3 system,and the phase,morphology and microstructure of the pyrolytic products were detected by X-ray diffraction（XRD） and scanning electron microscope（SEM）.Gibbs free energies and reaction thermodynamics of the system were theoretically calculated.Combining with experimental analysis,the mechanism for intermediate state carbon formation of carbon nanospheres by inorganic chemical reaction technology was studied.The results show that the pyrolytic products of CaC2-CHCl3 system are probably graphite,diamond and C3 atom gas.The Gibbs free energies,the reactive thermal effect and the adiabatic temperature of CaC2-CHCl3 system are-1 847.5 kJ/mol,-1 945.5 kJ/mol and 6 184 K,respectively.C3 atom gas is the intermediate carbon precursor of carbon nanospheres under the low temperature reaction and inorganic carbon source.Carbon nanospheres with maximum diameter of 200-300nm can be synthesized via CaC2-CHCl3 system.

关 键 词：纳米碳球 反应热力学 吉布斯自由能 绝热温度 

分 类 号：TB332[一般工业技术—材料科学与工程]