 This is just the exponential of minus the free energy of the critical nucleus formula_5, which is
This is the free energy barrier needed in the CNT expression for formula_1 above.From an experimental standpoint, this theory grants tuning of the critical radius through the dependence of formula_43 on temperature.The variable formula_69, described above, can be expressed as

where formula_71 is the melting point and formula_72 is the enthalpy of formation for the material.