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用扫描电子显微镜测定了纳米铝试样的粒径,结果表明Al试样平均粒径为18 nm.在温度108~385K,用精密低温绝热量热计测定了Al的等压摩尔热容,拟合出其等压摩尔热容与热力学温度的函数关系式.根据热容与热力学温度的函数关系,计算了以298.15 K为基准的纳米Al热力学函数,并与粗晶Al热容进行比较,从能量角度分析了不同粒径Al热容差别产生的原因.
The particle size of the sample was measured by scanning electron microscopy. The results showed that the average particle size of the Al sample was 18 nm. The isothermal equilibrium molar heat capacity of Al was determined at 108 ~ 385K with a precision low-temperature adiabatic calorimeter The relationship between isotherm molar heat capacity and thermodynamic temperature is obtained.According to the function of heat capacity and thermodynamic temperature, the thermodynamic function of nanoaluminum with 298.15 K is calculated and compared with that of coarse grained Al From the energy point of view, the reasons for the differences in the heat capacity of Al with different particle sizes were analyzed.