四针状纳米氧化锌的热力学函数  

Thermodynamic functions of tetrapod-shaped ZnO nanostructures

作　　者：范高超[1] 黄在银[1,2] 马玉洁[1] 姜俊颖[1] 李艳芬[1] 谭学才[1] 

机构地区：[1]广西民族大学化学与生态工程学院,南宁530006 [2]广西民族大学广西壮族自治区林产化学品开发与应用重点实验室,南宁530006

出　　处：《中国科学：化学》2011年第9期1477-1481,共5页SCIENTIA SINICA Chimica

基　　金：国家自然科学基金(20963001);广西自然科学基金(0832078 & 0991085)资助

摘　　要：采用简单、温和的微乳液水热辅助法合成了尺寸、形貌均匀的四针状ZnO纳米结构,每个结构由四根长约250nm的纳米针组成.基于块体ZnO的热力学函数已知,依据热力学势函数法设计热化学循环,将纳米ZnO与块体ZnO的热力学函数进行了关联.并结合热动力学理论及过渡态理论,利用微量热技术获得了所制备的四针状纳米ZnO在298.15K下的标准摩尔生成焓、标准摩尔生成Gibbs自由能、标准摩尔熵值分别为(-329.37±0.43)kJmol-1,(-318.51±0.03)kJmol-1,(20.36±1.05)Jmol-1K-1.Tetrapod-shaped ZnO nanostructures with uniform size and morphology were prepared by a simple and mild microemulsion-mediated hydrothermal route. The characterization results revealed that each tetrapod-shaped nanostructure consisted of four nanoneedles which were about 250 nm in length. Based on the known thermodynamic functions of bulk ZnO, thermodynamic functions of nano ZnO with bulk ZnO were associated through designing a thermochemical cycle according to thermodynamic potential function method. And combined with thermokinetic theory, transition state theory and microcalorimetry, standard molar enthalpy of formation, standard molar Gibbs free energy of formation and standard molar entropy at 298.15 K for the as-achieved tetrapod-shaped ZnO nanostructures were gained as （-329.37 ± 0.43） kJ mol-1, （-318.51 ± 0.03） kJ mol-1 and （20.36 ± 1.05） J mol-1 K-1, respectively.

关 键 词：纳米热力学 热力学函数 微量热技术 纳米ZNO 微乳液法 

分 类 号：TB383.1[一般工业技术—材料科学与工程]