Investigation of the processes of evaporation
of the thin films of materials in the condition
of strong AND FAST overheat
Numerous experimental data on investigation of the processes of evaporation of the thin films of materials in the condition of a strong and fast overheat show the existing of the limit of overheat temperature, which corresponds to the upper border of thermostability of the condensed matters. All this data contradict to the well-known Arrenius Law in thermodynamics.
For example on Fig.1 the results of the experimental registration of the thin film life time under the fast and strong overheat examination are presented.
Fig.1 The curves from left to right: naphthalene, water, alcohol (ethanol).
T - temperature (0K), t - life time (sec)
Analyzing this diagram in coordinates lg(1/t), (1/T), it is important to remember that the angle of slope of direct parts of curves must correspond to the vaporization heat in the well-known Knudsen-Lengmure equation for the vaporization velocity of low-molecular liquids. For the linear polymers that corresponds to the energy of activation in the Arrenius equation. So, the point of crossing of any curves with an ordinate axis gives the well-known value of the pre-exponential coefficient in this equation. But it is never reached at a practice...
For more detailed information about experimental setup, please, see our publications:
1. Yndev D.N., Lash A.A., Shlenskii O.F. et al. The use of thermal and moving imaging to study the kinetics of thermolysis and evaporation of thin layers of thin layers of matter- High Temperature, v.27, No. 2, 1989. - pp..369-373.
2. Rogatkin D.A., Shlenskii O.F., Yndev D.N. On the use of thermal imaging to study the kinetics of thermolysis and evaporation of thin layers of thin layers of matter. - High Temperature, v.34, No. 5, 1996. - pp.823-824.
3. Yndev D.N., Rogatkin D.A., Moiseeva L.G. Optical interference method of investigation of the kinetics of thermolysis and evaporation of thin layers of thin layers of matter under the effect of ultrasound. - High Temperature, v.36, No. 1, 1998. - pp.161-164.