Crystallization and matrix formation - Crystallization dynamics - Nucleation
5 important questions on Crystallization and matrix formation - Crystallization dynamics - Nucleation
What are 3 different ways to get a nucleus?
- Seeding --> manually adding small crystals
- Heterogeneous nucleation --> particles where molecules from the solution may be absorbed on
- Homogeneous nucleation --> in very pure systems, large supersaturation causes dissolved molecules to associate themselves, concentration of those associates becomes so large it becomes a nucleus
What is the rate of homogeneous or heterogeneous nucleation strongly dependent on?
What happens to the viscosity at larger supersaturation or supercooling?
How can nucleation be avoided if you want to keep a supersaturated solution?
What happens to the viscosity of a supersaturated solution, if nucleation does not take place, and how does this depend on the type of solution?
In sugar solutions, the viscosity increases rapidly with higher concentration or lower temperature. The crystallisation and glass transition lines are close in the state diagram.
In systems where these lines are further apart, you might not see this slowing effect as clearly.
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