溶解法测定纳米AgCl 的热力学函数

Determination of thermodynamic function of nano-AgCl by dissolution method

为进一步丰富纳米热力学函数研究,采用微乳液法可控制备了纳米氯化银,利用X-射线衍射技术和场发射扫描电镜技术对其物相组成及形貌结构进行了表征。基于纳米溶解热力学理论,进一步得到了纳米AgCl的溶解热力学函数和表面热力学函数。计算了纳米AgCl的规定热力学函数,ΔfHθm为-115.35kJ/mol,ΔfGθm为-105.38kJ/mol,Sθm为121.89J/(mol·K)。纳米AgCl溶解吉布斯自由能随温度呈正相关,表面吉布斯自由能与温度呈负相关。

In order to further enrich the nano-thermodynamic function,the nano-silver chloride was prepared by micro-emulsion method,and the composition and the morphology of the nano-silver chloride were characterized by the X-ray diffraction technique and the field-emission scanning electron microscope technique. Based on the nano-dissolution thermodynamic theory,the dissolution thermodynamic function and the surface thermodynamic function of the nano-AgCl were obtained. And then the thermodynamic functions of the nano-AgCl were calculated. The results showed that,the Δ f H θ m was -115.35 kJ/mol,Δ f G θ m was -105.38 kJ/mol, S θ m was 121.89 J/(mol·K). The free energy of Gibbs free energy was positively correlated with the temperature,and the free energy of surface Gibbs free energy was negatively correlated with the temperature.