标题:
粒径相同形貌不同的纳米氧化亚铜的标准摩尔生成焓值Standard Molar Enthalpy of Formation of Nano Cuprous Oxide with Similar Particle Sizes but Different Morphologies
作者:
朱子富, 倪孜斌, 王婧吟, 胡士祥, 李小竹, 吴新民
关键字:
纳米氧化亚铜, 不同形貌, 微热量热仪, 热力学循环, 标准摩尔生成焓Nano Cuprous Oxide, Different Morphologies, Micro-Calorimeter, Thermodynamic Cycle, Standard Molar Enthalpy of Formation
期刊名称:
《Hans Journal of Nanotechnology》, Vol.5 No.1, 2015-02-03
摘要:
文章中合成了四种粒径相近，形貌不同的纳米氧化亚铜，并进行了XRD和SEM表征，知其形貌分别为球形, 立方块，六棱柱，六角形，其粒径均在20 nm左右。根据盖斯定律设计了热循环，并通过RD496-2000微热量热仪对热循环中的反应物与生成物进行溶解焓测定，经计算得到标准摩尔生成焓，其值分别为(−77.284 ± 0.191) kJ/mol, (−136.084 ± 0.194) kJ/mol, (−137.114 ± 0.203) kJ/mol, (−162.114 ± 0.220) kJ/mol。由此得到纳米氧化亚铜的标准摩尔生成焓因形貌不同而不同的结论，且形貌差别越大，标准生成焓值差别也越大。Four kinds of nano cuprous oxide with similar particle sizes but different morphologies were syn-thesized. According to the XRD and SEM pictures, their particle sizes were about 20 nm, and the morphologies were determined as sphere, cube, hexagonal prism and hexagon. A thermodynamic cycle was designed according to the law of Hess. The dissolution enthalpy of reactants and products were determined by RD496-2000 micro-calorimeter based on the designed thermodynamic cycle. And then the standard molar enthalpies of nano cuprous oxide were calculated. They are (−77.284 ± 0.191) kJ/mol, (−136.084 ± 0.194) kJ/mol, (−137.114 ± 0.203) kJ/mol and (−162.114 ± 0.220) kJ/mol. The results show that the bigger difference of the morphologies of nano cuprous oxide, the bigger difference of the standard molar formation enthalpies.