摘要
采用微乳液水热辅助法合成了三种不同尺寸的手榴弹状ZnO微/纳结构.通过设计热化学循环,建立了纳米ZnO与块体ZnO体系热力学性质之间的关系.并结合微量热技术对不同尺寸ZnO微/纳体系的热力学性质进行了计算.结果表明,尺寸效应对微/纳体系热力学性质有显著的影响:随着反应物尺度的减小,体系的标准摩尔反应焓、标准摩尔反应Gibbs自由能、标准摩尔反应熵均降低,而材料自身的标准摩尔生成焓、标准摩尔生成Gibbs自由能、标准摩尔熵均增加.
Grenade-like ZnO micro/nano structures with three different sizes were prepared by microemul- sion-mediated hydrothermal route. Through designing a thermochemical cycle, the relationship between thermodynamic properties of nano ZnO and bulk ZnO systems was built. Combined with microcalorimetry, thermodynamic properties of the ZnO micro/nano systems with different sizes were calculated. The results revealed that size effect has significant influences on thermodynamic properties of micro/nano systems. Along with the size of reactants decreasing, the standard molar enthalpy of reaction, standard molar Gibbs free energy of reaction and standard molar entropy of reaction of micro/nano systems decreased, but the standard molar enthalpy of formation, standard molar Gibbs free energy of formation and standard molar en- tropy of themselves increased.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2012年第7期938-942,共5页
Acta Chimica Sinica
基金
国家自然科学基金(No.20963001)
广西自然科学基金(Nos.0832078
0991085)
广西区研究生科研创新项目(No.2011106080817M366)资助~~
