Investigation on thermodynamic properties of nano-sized ZnS based on particle size effect and temperature effect
YAN Zhiyu1， SHI Qingqing1， SUN Hao1， WANG Yi1， LIU Jinyang1， LU Fengying1， HE Nianxin1， TAN Xiuniang1， HUANG Zaiyin1,2
(1.College of Chemistry and Chemical Engineering， Guangxi Minzu University， Nanning 530008， China；2.Guangxi Colleges and Universities Key Laboratory of Food Safety and Pharmaceutical Analytical Chemistry， Nanning 530008， China)
Abstract：Nanomaterials often exhibit unique properties that are different from those of their parent material because of the special surface and small size effects that occur when the material reaches the nanometer level. This work focuses on the size effect and temperature effect on the thermodynamic properties of ZnS nanomaterials. In this paper， a hydrothermal method was investigated to prepare five different sizes of ZnS nanoparticles and to determine their electrical conductivity at different temperatures in equilibrium in aqueous solution. According to the obtained data， based on the thermodynamic cycle method， the theory of dissolution thermodynamics and the principle of electrochemical thermodynamic equilibrium， the law between particle size and temperature and the thermodynamic properties of nano-ZnS was discussed. The result shows that the dissolution thermodynamic function， molar surface thermodynamic function， partial molar surface thermodynamic function and prescribed thermodynamic function of nano-ZnS all have a good linear relationship with particle size and temperature. The dissolution thermodynamic function， molar surface thermodynamic function， partial molar surface thermodynamic function and prescribed thermodynamic function of nano-ZnS all have a good linear relationship with particle size and temperature. This paper further demonstrated the theory of dissolution thermodynamics and provides theoretical support for studies involving related nanomaterials.
2023, Vol. 57 
