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Atma木虫 (小有名气)
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[交流]
【请教】纳米金属的熔点是不是比正常金属低很多？
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比如铜的熔点是1083度， 那铜纳米线的熔点大概在多少？会小几百度吗？ |
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wenhualuo
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3楼2010-03-26 14:22:40
fdtdpc
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Size Effect on the Thermodynamic Properties of Silver Nanoparticles The Gibbs free energy of silver nanoparticles has been obtained from the calculations of bulk free energy and surface free energy for both the solid and liquid phase. On the basis of the obtained Gibbs free energy of nanoparticles, thermodynamic properties of silver nanoparticles, such as melting temperature, molar heat of fusion, molar entropy of fusion, and temperature dependences of entropy and specific heat capacity have been investigated. Calculation results indicate that these thermodynamic properties can be divided into two parts: bulk quantity and surface quantity, and surface atoms are dominant for the size effect on the thermodynamic properties of nanoparticles. The method that the intersection of the free-energy curves for solid and liquid nanoparticles decide the melting point of nanoparticles demonstrates that the surface free-energy difference between the solid and liquid phase is a decisive factor for the size-dependent melting of nanostructural materials. |
5楼2010-03-26 22:25:18
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