Abstract: The special properties of nanoparticles differ significantly from those of their corresponding bulk substances, which are determined by the interfacial thermodynamic properties. It is well known that the interfacial thermodynamic properties of nanomaterials are related to their morphology and particle size. It has been reported in the literature that cubic nanoparticles exhibit excellent properties, but the quantitative influence regularities of particle size on the interfacial thermodynamic properties of cubic nanoparticles have not been reported previously. In this paper, theoretically, the relational expressions of the interfacial thermodynamic properties and particle sizes of cubic nanoparticles were derived; additionally, an electrochemical method to measure the interfacial thermodynamic properties of cubic nanoparticles was proposed. Experimentally, the cubic In2O3 nanoparticles was taken as a system, the electrode potential and its temperature coefficient of cubic In2O3 nanoparticles with different particle sizes were measured at different temperatures. In addition, the interfacial thermodynamic properties of cubic In2O3 nanoparticles were calculated. The results show that the interfacial electrode potential, molar interfacial Gibbs energy, molar interfacial enthalpy, molar interfacial entropy and molar interfacial internal energy increase with the decrease of the side-length of cubic In2O3 nanoparticles. When the side-length exceeds 20 nm, these physical quantities are linearly related to the reciprocal of the mean side-length, and the experimental results are in good agreement with the theoretical predictions. The results obtained in the study can quantitatively describe the relationship between the interfacial thermodynamic properties and the side-length of cubic nanoparticles, and can provide significant insights for the research and application of cubic nanoparticles

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