Chapter 11 Flashcards

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1
Q

Two components of producing a new phase

A

Nucleation and Growth

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2
Q

Two types of nucleation

A

Homogeneous and Heterogeneous

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3
Q

Homogeneous Nucleation

A

nuclei of the new phase form uniformly throughout the parent phase

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4
Q

Heterogeneous Nucleation

A

nuclei form preferentially at the surfaces of structural inhomogeneities (e.g., container surfaces, insoluble impurities.)

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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

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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

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