Summary: Colloid Chemistry Week 1
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1 Lifshitz-Van der Waals Interactions
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What are Forces of Relevance for Colloids?
Van der Waals interactions
Polar interactions
Electrostatic interactions -
How is the Hamaker constant determined?
It can be estimated from molecular properties
It can be calculated from surface tension data
It can also be determined using the Lifshitz formalism -
What does the Hamaker constant being negative correspond too?
Positive Hamaker constant -> negativeGibbs free energy + attractive van der Waals
NegativeHamaker constant ->Positive Gibbs free energy + repulsive van der Waals -
2 Polar/Lewis Acid-Base Interactions
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How is hydrophobicity/phility estimaded?
Compared with water, assuming equal acidity and alkalinity. -
3 Wetting; Young-Dupre
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Why do want to measure the contact angle?
To estimate the surface tension -
How would you be able to measure/determine the individual surface tension components of a solid?
Measure the surface tension of the solid + liquid, pure component liquid, and calculate surface tension with matrix algebra. -
How is the matrax solved?
Least-Squared method and regression analysis. -
Why not average the information?
You will lose information over the spread/deviation -
Can you choose any liquid as a proble liquid?
No, because spreading may occur of deltaG is positive -
What are regression pitfalls?
The determinant of the matrix formed from the interfacial tension components has to be very accurate, otherwise you have very large errors.
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