CH1012
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1
LECTURE 3
LAST LECTURE
• Colloids:   10 nm - 1 mm solid particles / liquid
 disperse phase in a dispersion medium
 retained on ultrafilters  eg. cellular fluid
 charged surfaces® interparticle repulsion
 Brownian motion: collisions; > T sediments
Charge  1) ionisable surface grps.   
               2) adsorption of ions
Diffuse electric double layer model
Electrolyte neutralises surface charge
Classes:      monodisperse, polydisperse
Properties:  S.A. / volume very high