Theroetical Emulsification Flashcards
what is an emulsion
metastable dispersion of liquid droplets in an immiscible liquid
single emulsion
2 component system
o/w
double emulsion
3 component system
w/o/w
in a pharmaceutical emulsion what should the droplet diameter be
100nm-25um
what is a colloids
multi-component dispersed phase systems where disperse phase is within 1-1000nm
what is the most common emulsion type
o/w
different phases of emulsification
separate
unstable dispersion
phase sepraration
which one of the phases has high interfacial energy
unstable dispersion
which phase is thermodynamically unfavourable
unstable dispersion
how can you make a droplet last
use emulsifier and viscosity enhancer
different emulsification mechanisms
- flocculation
- cracking
- creaming
- sedimentation
DLVO theory: name the two attractions
electrical repulsion
vdw attraction
in sedimentation the particles will .. in …… phase under opposing forces
sink
continuous
what will promote the sedimentation
large droplet size
low fluid viscosity
greater density difference between droplet and continuous phase
