Concept of the Critical Nucleus in Nucleation

概要

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Reconsideration on the concept of critical nucleus for single component systems leads to the result that the size n^h_K of a kinetic critical nucleus for which the probabilities of its decay and growth balance is not equal to the size n^<h*> of the thermodynamic one for which the reversible work of nucleus formation takes the maximum value. n^h_K is in general smaller than n^<h*>, and there exist two values for n^h_K, the larger is kinetically unstable but the smaller is stable. The difference between n^<h*> and the larger n^h_K increases but the difference between the two values of n^h_K decreases with the degree of supersaturation or supercooling, and in the critical state two values of n^h_K coincide and it diminishes to 8/27 of n^<h*> for three dimensional homogeneous nucleation and to 1/4 of n^<h*> for two dimensional disc nucleation on a substrate. Beyond this critical state n^h_K does not exist and for a nucleus with any size the probabilty of growth is higher than that of decay.nucleationthermodynamic critical nucleuskinetic critical nucleusrunaway instability
東北大学の論文
1997-03-20