Abstract
ABSTRACT Crystal size and size distribution in precision controlled precipitations is modeled using the balanced nucleation-growth (BNG) process model. The BNG model predicts the experimental result that many crystallization processes lead to a limited number of crystals during a nucleation period followed by growth. The crystal size distribution, maximum crystal size, L m , number of crystals, N m , and nucleation time, t e , are modeled as a function of molar reactant addition rate during nucleation, R a , nucleation efficiency, F n , critical nucleus size, L n , and crystal maximum growth rate, G m . The model predicts that the maximum crystal size, L m , is independent of addition rate, R a , and nucleation efficiency, F n . It increases with nucleus size, L n , and crystal maximum growth rate, G m . The nucleation time, t e , is independent of addition rate, R a . It increases with increasing nucleus size, L n , and decreases with increasing nucleation efficiency, F n , and growth rate, G m . The crystal size distribution is independent of addition rate, R a , and growth rate, G m . The small size crystal population increases with increasing nucleus size, L n , and at low growth rates, G m . The crystal size distribution narrows with increasing nucleation efficiency, F n . In combination of effects, each variable has its own fingerprint and may be experimentally discerned from the others.
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