Abstract
Grenade-like ZnO micro/nano structures with three different sizes were prepared by microemulsion-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 entropy of themselves increased.
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