尺寸效应和表面效应对纳米颗粒比热容的影响  

Surface and size effects on specific heat capacity of nanoparticle

作　　者：王补宣[1] 周乐平[1] 彭晓峰[1] 

机构地区：[1]清华大学热能工程系,北京100084

出　　处：《热科学与技术》2004年第1期1-6,共6页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(59995550 -3)

摘　　要：从弹性介质假设出发 ,考虑内部和表面原子对比热容的贡献不同 ,建立起纳米颗粒比热容的理论模型 ,分析了尺寸效应、温度和表面原子振动软化对纳米颗粒比热容的影响 ,提出比热容与尺寸和温度之间的关系 ;以氧化铜颗粒为计算对象 ,具体计算考虑表面和尺寸效应的比热容 。Extending the elastic continuum model for fine particles, a predicting method was proposed for specific heat capacity to include the different contribution of interior and surface atoms. The effects of size and temperature and the softening of surface atom vibration were studied, and a new nondimensional variable was proposed to characterize the effects of particle size and temperature on specific heat capacity. The proposed model was used to fit well experimental data for copper oxide nanoparticles.

关 键 词：尺寸效应 表面效应 纳米颗粒 比热容 

分 类 号：O551.3[理学—热学与物质分子运动论]