The thermal properties of nanomaterials are inseparably linked to the motion behavior of molecules and atoms in the material.


such as the melting point of nanomaterials.


The melting point of a solid substance is fixed when its form is large in size. For nanoparticles, due to the small particles, the high surface energy of the particles, the large number of surface atoms, the incomplete coordination of these surface atoms, the large activity and the volume is much smaller than that of the bulk material, so the increase in the internal energy required for the melting of the nanoparticles Much smaller, that's the sharp drop in the melting point of the nanoparticles.


For example, the conventional melting point of gold is 1064°C (1337K), and when the particle size is reduced to 20nm, the melting point is only about 800°C.

The melting point of silver is about 961 ℃, while the melting point of nano-silver powder can be lowered to about 100 ℃.

The melting point of copper is 1083 ℃, while the melting point of nano copper powder can reach about 700 ℃.

Of course, the accuracy of the melting point determination is related to the purity of the sample, the amount of the sample, the fineness of the sample, the tightness of the filling and the burning rate.