Chapter 11 Flashcards
1
Q
Two components of producing a new phase
A
Nucleation and Growth
2
Q
Two types of nucleation
A
Homogeneous and Heterogeneous
3
Q
Homogeneous Nucleation
A
nuclei of the new phase form uniformly throughout the parent phase
4
Q
Heterogeneous Nucleation
A
nuclei form preferentially at the surfaces of structural inhomogeneities (e.g., container surfaces, insoluble impurities.)
5
Q
Critical radius for a solid stable particle (homogeneous nucleation)
A
r* = -(2gamma)/(Change in Gv)
gamma: Surface free energy
Change in Gv: Volume free energy
6
Q
Critical radius for stable solid particle (heterogeneous nucleation)
A
r* = -(2*gammasL)/(change in Gv)
gammasL: Solid-liquid interfacial energy
change in Gv: Volume free energy