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采用反相微乳液法在室温条件下制备了尺寸、形貌高度均一的钼酸钙(CaMoO4)纳米饼,并运用X射线粉末衍射(XRD)、场发射扫描电子显微镜(FE-SEM)对其组成、结构和形貌进行了表征.利用原位微量热技术研究了所得产物与盐酸反应过程的热动力学;基于热力学势函数法设计热化学循环,并结合化学反应的过渡状态理论求算了298.15 K下产物的标准摩尔生成焓、标准摩尔生成Gibbs自由能及标准摩尔熵;基于纳米材料与对应块体材料热力学性质的本质差异,获得了产物的表面热力学性质如比表面熵、比表面焓与比表面Gibbs自由能.
(CaMoO4) nanomaterials with uniform size and shape were prepared by reverse microemulsion method at room temperature, and characterized by X-ray powder diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) The composition, structure and morphology of the product were characterized by in situ microcalorimetry. The thermodynamics of the reaction between the obtained product and hydrochloric acid was studied. The thermochemical cycle was designed based on the thermodynamic potential function method. Combined with the transition state theory of chemical reaction, The standard molar enthalpy of formation, Gibbs free energy of standard molar production and standard molar entropy of 298.15 K were obtained. Based on the essential difference of the thermodynamic properties between the nanomaterials and the corresponding bulk materials, the surface thermodynamic properties such as specific surface entropy, specific surface enthalpy Gibbs free energy with specific surface.