theoretical emulsification

Created by: anna888
Created on: 08-03-23 14:21

what is emulsifaction

metastable dispersion of liquid droplets in an immiscible liquid

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describe the two types of emuslification

single- two components,liquid drops in another liquid. double- 3 components, primary emuslion droplets in another liquid

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what are the 3 phases of emulsion, describe each and how to get from one to another

seperate-low energy, thermodynamically favorable, stable. SHAKE. unstable dispersion- high energy, thermo unfav, unstable, transient(temporary). STAND back to seperate

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how to make dispersion phase last

emulsifiers(surfactants) or viscoity enhancers to inhibit diffusion

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why are emuslifiers used

they are amphiphillic and acn attract both water and oil, reduced surface interfacial tension

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describe processes of emuslion instability- reversible or not

creaming-r. cracking ir. flocculation r. coalesence ir. sedimentaion r.

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describe dvlo theory and points 1 2 3 of graph

repulsion as electrical double layer. attraction as v der waals1. net attraction- reversible coaggulation. 2. net repulsion- stable dispersion. 3. net attraction- reversible flocculation

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describe sedimentaion. what effects it

particles sinking through continuous phase due to gravity. increased particle size and density increase it. viscoity as drag force

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describe bancrofts rule. what is hlb and describe perameters

the phase in which the emulsifier is more soluble in will be the continuous phase. hlb= hydrophile lipophile balance. low hbl means emulsifier mainly lipophillic. and vise versa.

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hlb perameters from w/o and o/w emulsions

w/o= 3-6. o/w=8-16

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Other cards in this set

Card 2

Front

describe the two types of emuslification

Back

single- two components,liquid drops in another liquid. double- 3 components, primary emuslion droplets in another liquid

Card 3

Front

what are the 3 phases of emulsion, describe each and how to get from one to another

Back

Card 4

Front

how to make dispersion phase last

Back

Card 5

Front

why are emuslifiers used

Back

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theoretical emulsification