Saturation nucleus surface density

Figure 19.11 shows the natural logarithm of the fraction of residual nucleus sites of (Ng-N)/Ns based on Eq. (19.9) as a function of time. The residual fraction decreases linearlj with time giving the rate constant of Jq. The straight line can be applied up to 90-95% of the active sites, whereas the non-crystallized area remains about 90%. These results clearly indicate that almost all the active sites with the limited number are controlled by the heterogeneous nucleation mechanism. These characteristics of the active sites are not known. In the other explanation for the saturation density, there is a nucleation exclusion zone [58]. The nucleation will stop and reaches to the saturation density when the exclusion zone is overlap on the whole substrate surface. The zone might be associated with the density fluctuation around the... 

---