Transcription of Lecture 4 Suspension and emulsion stability
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Lecture 4 Suspension and emulsion stability
Suspension and emulsion stability Forces of attraction Steric repulsion Electrostatic repulsion Electrosteric repulsion Lecture 4. ACS 2007. Strength of interparticle forces . Rates of flocculation The time for half the particles to flocculate is: d 3W. t1/ 2 =. Since flocculation is a change in average 8 kT. particle size, the half life can be measured. And W, the stability ratio, determined.. U11 dH. The stability ratio depends on the W = d exp 2. interparticle forces: 0 kT H. Measurements on unstable dispersions showed that particles attract each other over distances comparable to particle sizes. ACS 2007 Lecture 4 - Suspension and emulsion stability 1. Hamaker model - Calculate the attraction between particles from molecular attractions Molecules in Molecules in particle 1 particle 2. H. 3. The intermolecular attraction is the U11 = 11r 6. London (dispersion) energy: 2. ACS 2007 Lecture 4 - Suspension and emulsion stability 2.
ACS© 2007 Lecture 4 - Suspension and emulsion stability 2 Hamaker model - Calculate the attraction between particles from molecular attractions
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