Test to Determine the Type of emulsion

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Drop dilution test
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1. Take the unknown emulsion and put it in the test tube 2. add water to it and shake it up 3. if the water mixes with the oil you have an oil/water emulsion 4. if the water does not mix with the oil you have a water/oil emulsion
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Dye solubility test
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you can use a water soluble or an oil soluble
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In the dye solubility test if you use a water soluble dye…
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take the emulsion and spread it on the slide with the dye – if you see a lot of red dots the emulsion is water/oil emulsion – if you see complete redness then you have a oil/water emulsion
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Electrical conductivity test
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all you to determine the external phase of the emulsion
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When conducting the electrical conductivity test you should know that
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oils are not conductors of electricity water is a conductor of electricity
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If when conducting the electrically conductivity test and the light comes on the the external phase is
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water
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If conducting the electrical conductivity test and the light does not turn on the external phase is
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oil
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Filter Paper test
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take the emulsion and dip it in filter paper – if the emulsion moves up the paper it is o/w emulsion – if the emulsion does not move up the paper it is a water/ oil emulsion
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When conducting the filter paper test oil does not
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run up the filter paper
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When conducting the filter paper test
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water runs up the filter paper
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methods to determine the stability of an emulsion include
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1. particle size analysis 2. Rheology 3. Strokes equation
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If the particle size increases overtime then the particle is said to be
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unstable
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When preforming the particle size analysis to determine stability take the emulsion and analyze the change in
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particle size over time – this will allow us to determine if particle is stable
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Change in particle size
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means the emulsion is unstable
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No change in the particle size means the particle is
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stable
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Rheology is used to determine the stability of the emulsion by analyzing the
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viscosity
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In the Rheology test change in viscosity means that
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the emulsion is unstable

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