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Emulsions and Mr. Emulsifier

Emulsions and Mr. Emulsifier. Go to Slide Show mode, click the red button and enjoy!. Emulsions. We will examine an oil-in-water emulsion These are common in food systems and include things like mayonnaise Here is our prototypical system with two oil droplets dispersed in water.

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Emulsions and Mr. Emulsifier

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  1. Emulsions and Mr. Emulsifier Go to Slide Show mode, click the red button and enjoy!

  2. Emulsions • We will examine an oil-in-water emulsion • These are common in food systems and include things like mayonnaise • Here is our prototypical system with two oil droplets dispersed in water

  3. Emulsions (Oil in water, O/W) oil Oil droplets want to coalesce--this reduces surface tension oil

  4. Emulsions (Oil in water, O/W) oil

  5. Emulsions (Oil in water, O/W) oil Separates and floats to top because oil is less dense than water

  6. Emulsions (Oil in water, O/W) oil To prevent phase separation we need an emulsifier oil

  7. head Emulsifiers • Emulsifiers have the following general molecular features Polar head, likes water Non-polar tail, likes oil

  8. Emulsions (Oil in water, O/W) oil oil What happens to this picture when we add emulsifiers?

  9. Emulsions (Oil in water, O/W) oil This system is stabilized due to a lowering of surface tension by the emulsifier. oil

  10. Emulsions (Oil in water, O/W) • Now the water sees only the polar emulsifier heads (which, by the way, it likes) • The oil droplets can see only the nonpolar emulsifier tails (for all it knows it is surrounded by oil) • Everybody is happy and there is no driving force for separation of the phases

  11. Emulsifier analogy • When the Purdue basketball teams play Indiana at Assembly Hall, the place is a sea of Crimson and Cream • Like this

  12. Emulsifier analogy

  13. Emulsifier analogy • To make things as uncomfortable as possible, Purdue students are seated together in small, separated groups • Like this

  14. Emulsifier analogy

  15. Emulsifier analogy • In this set up, where are the problems likely to occur? • Can you figure it out?

  16. Problem here? No. Problem here? Yes! Problem here? No. Emulsifier analogy

  17. Emulsifier analogy • How can we defuse this potential problem (high tension) at the interface between the Indiana students and the Purdue students? • Let’s look at the interface more closely

  18. Emulsifier analogy

  19. Emulsifier analogy • What we need at this point is a very special person • This person got their B.A. at Indiana and their M.S. at Purdue • He likes both universities (and their basketball teams) passionately • He can’t decide who to cheer for

  20. Emulsifier analogy • In fact, he is so fanatical he has had special clothes made up which he wears to the games • One half is Black and Gold • One half is Crimson and Cream • Are you ready? • Here he comes

  21. Nuts!! Go Purdue! Mr. Emulsifier Emulsifier analogy

  22. Emulsifier analogy • Now the Purdue fan sees another Purdue fan sitting next to him and the IU fan sees an IU fan sitting next to him • Interfacial tension lowered • Problem solved • Go Purdue!

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