Nucleation-Thermodynamics Flashcards
1
Q
What is the barrier to solidification below a material’s melting point?
A
interfacial energy
2
Q
critical nucleus size
A
size at which nucleus will spontaneously grow
3
Q
homogeneous nucleation
A
spontaneous nucleation within parent body
4
Q
heterogeneous nucleation
A
nucleation occurs on a foreign body or defect site in parent phase
5
Q
Young’s equation
A
γwl = γnlcos(theta) + γwn
6
Q
C*/Co =
A
exp(-ΔG*/kT) = exp(A/ΔT^n)
7
Q
for ΔT = 0, what is C*/Co?
A
0, no probability of nucleation
8
Q
for ΔT = infinity, what is C*/Co?
A
1, 100% probability of forming a nucleus
9
Q
N =
A
foCoexp(-ΔG*/kT), units (# nucleui/ volume * time)
10
Q
What are units for Co?
A
nuclei/volume
11
Q
What are units of fo?
A
Hz
